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Effect of Grain Size on High Temperature Oxidation Behavior of IN792 Superalloy
IN792 초내열 합금의 고온 산화 거동에 미치는 결정립 크기의 영향
Ji-Ye Bang, Dong-Hyun Lee, Soo Yeol Lee
방지예, 이동현, 이수열
Korean J. Met. Mater. 2024;62(4):267-274.   Published online 2024 Mar 29
DOI: https://doi.org/10.3365/KJMM.2024.62.4.267

Abstract
It is known that Ni-based superalloys possess superior mechanical properties in high-temperature and high-pressure environments. One of the drawbacks of these alloys is their tendency to oxidize at high temperatures. Improving their oxidation properties and obtaining a fundamental understanding of the underlying mechanism of their oxidation behavior are critical for..... More

                
Effect of Heat Treatment Temperature on Microstructure, Tensile Properties and -Precipitate Phase in Ni-based Superalloy
Ni-based 초내열합금의 미세조직, 인장특성, δ 석출상에 미치는 열처리 온도의 영향
Jeon Young Song, Ji Ho Gu, Jong Ho Shin, Won Hui Jo, Cho Hyeon Lee, Jae Bok Seol, Young Wha Ma
송전영, 구지호, 신종호, 조원희, 이초현, 설재복, 마영화
Korean J. Met. Mater. 2024;62(1):32-38.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.32

Abstract
Here, we investigated the influence of δ-precipitate (orthorhombic D0a Ni3Nb-ordered phase) on the room- and high-temperature tensile properties in wrought nickel-based Inconel 625 superalloys subjected to solution and aging heat treatment. Typically, solution heat-treatment temperatures in these alloys affect the solid-state precipitation of δ-phase, which governs high-temperature tensile properties. While..... More

                
Effect of Single Crystal Growth and Solidification Grain Boundaries on Weld Solidification Cracking Behavior of CMSX-4 Superalloy
CMSX-4 초내열합금 용접 응고균열 거동에 미치는 단결정 성장 및 응고결정립계의 영향
Kyeong-Min Kim, Ye-Seon Jeong, D.V. Kiran, Suk-Hwan Kwon, Seong-Moon Seo, Eun-Joon Chun
김경민, 정예선, D.V. Kiran, 권석환, 서성문, 천은준
Korean J. Met. Mater. 2024;62(1):22-31.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.22

Abstract
Single-crystal superalloys have been popularly employed in high-temperature parts of gas turbines, such as blades. However, the welds of such alloys are highly susceptible to solidification cracking, which limits their applicability to high-temperature turbine blades. In this study, the effects of characteristics of weld solidification on solidification cracking susceptibilities (solidification..... More

                
Effect of High Temperature Oxidation on Surface Pit and Recrystallization of Directionally Solidified CM247LC Superalloy in Creep Gauge
일방향 응고 CM247LC 초내열합금 크리프 시편 게이지에서 고온 산화가 표면 피트 및 재결정 형성에 미치는 영향
Byung Hak Choe, Kwang Soo Choi, Sung Hee Han, Dae Hyun Kim, Jong Kee Ahn, Dong Su Kang, Seong-Moon Seo
최병학, 최광수, 한성희, 김대현, 안종기, 강동수, 서성문
Korean J. Met. Mater. 2023;61(12):951-957.   Published online 2023 Nov 30
DOI: https://doi.org/10.3365/KJMM.2023.61.12.951

Abstract
This study analyzed a recrystallization phenomenon that occurred simultaneously with hightemperature oxidation on the surface of a directionally solidified CM247LC creep specimen, using optical and scanning electron microscopy. After heat treatment, the surface of the specimen subjected to the creep test at 982oC was oxidized by exposure to high temperature..... More

                   Crossref 1
Effect of Process Parameter and Scanning Strategy on the Microstructure and Mechanical Properties of Inconel 625 Superalloy Manufactured by Laser Direct Energy Deposition
레이저 직접 적층 공정으로 제조된 Inconel 625 초합금의 미세구조 및 기계적 특성에 공정 변수 및 스캔 전략이 미치는 영향
Hyunji Nam, Qing-Ye Jin, Jiyoung Park, Wookjin Lee
남현지, Qing-Ye Jin, 박지영, 이욱진
Korean J. Met. Mater. 2023;61(10):772-784.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.772

Abstract
This study aimed to investigate the effect of process parameters on the microstructure and mechanical properties of Inconel 625 alloy manufactured by direct energy deposition process. The Inconel 625 samples were produced by varying the laser scanning speeds from 720 - 960 mm/min while maintaining the same the laser energy..... More

                   Crossref 1
Study on Solidification and Phase Transformation Behaviors in Ni-based Superalloy IN625
IN 625 초내열합금의 응고거동 및 상변태 온도 분석
Seonghyo Ham, Junho Park, Changyong Jo, Seungcheol Yang, Yunkon Joo, Jiho Gu, Jehyun Lee
함성효, 박준호, 조창용, 양승철, 주윤곤, 구지호, 이재현
Korean J. Met. Mater. 2023;61(4):261-268.   Published online 2023 Mar 22
DOI: https://doi.org/10.3365/KJMM.2023.61.4.261

Abstract
The solidification and phase transformation behaviors of IN625 with low C and Fe were investigated through directional solidification and quenching experiments. The primary and secondary dendrite arm spacing decreased exponentially as the solidification rate increased, demonstrating good agreement with theoretical equations. The MC carbide formed at a constant temperature gradient..... More

                   Web of Science 1  Crossref 3
Method of Suppressing Solidification Cracking by Laser Surface Melting and Epitaxial Growth Behavior for Directionally Solidified 247LC Superalloy
레이저 급속 표면용융에 따른 일방향응고 247LC 초내열합금의 에피택셜 성장 및 응고균열 억제 방안
Kyeong-Min Kim, Eun-Joon Chun
김경민, 천은준
Korean J. Met. Mater. 2023;61(4):252-260.   Published online 2023 Mar 22
DOI: https://doi.org/10.3365/KJMM.2023.61.4.252

Abstract
In this study, the relationship between solidification cracking and epitaxial growth behavior with the high-speed laser surface melting of a directionally solidified 247LC superalloys was fundamentally and metallurgically investigated, to develop a successful welding procedure for the next generation of gas turbine blades. Under typical laser surface melting conditions (scan..... More

                   Web of Science 1  Crossref 2
Analysis of a Single Crystal Solidification Process of an Ni-based Superalloy using a CAFE Model
CAFE 모델을 사용한 니켈기 초내열합금 단결정 응고공정 해석
Jae Jun Jeong, HyungSoo Lee, Dae Won Yun, Hi Won Jeong, Young-Soo Yoo, Seong-Moon Seo, Je Hyun Lee
정재준, 이형수, 윤대원, 정희원, 유영수, 서성문, 이재현
Korean J. Met. Mater. 2023;61(2):126-136.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.126

Abstract
The efficiency of gas turbines depends on the gas turbine working temperature. Single crystal blades are being applied more often than equiaxed blades in gas turbine engines, to increase the turbine inlet temperature, resulting in enhanced turbine engine efficiency. Single crystal blades endure creep conditions at high temperature better than..... More

                   Web of Science 2  Crossref 2
Variation of liquation cracking susceptibility for overaged 247LC superalloy repair weld heataffected zone
장시간 열간노출에 따른 247LC 초내열합금 보수용접 열영향부의 액화균열민감도 변화
Hye-Eun Jeong, Seong-Moon Seo, Eun-Joon Chun
정혜은, 서성문, 천은준
Korean J. Met. Mater. 2023;61(2):69-75.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.69

Abstract
In this study, the liquation cracking temperature range (LCTR) of over-aged 247LC superalloy repair welds was quantitatively evaluated using spot-Varestraint testing, especially for application in the repair weld heat-affected zone (HAZ). The metallurgical mechanism of the evaluated liquation cracking susceptibility and variation of the LCTRs of the over-aged 247LC superalloys..... More

                   Web of Science 1  Crossref 2
Effect of Grain Boundary Morphology on the High Temperature Tensile Properties of Developed Ni-Based Superalloy (LESS)
Ni기 초내열 개발 합금(LESS)의 고온 인장특성에 미치는 결정립계 형상의 영향
Yong Kwan Shin, Byung Il Kang, Jeong IL Youn, Yong Nam Kwon, Young Jig Kim
신용관, 강병일, 윤정일, 권용남, 김영직
Korean J. Met. Mater. 2022;60(12):940-949.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.940

Abstract
In order to investigate the mechanical properties of the developed wrought γ'-hardened Ni-based superalloy, LESS alloy (Low Eta Sigma Superalloy), and to understand the deformation behavior, tensile tests were carried out from room temperature to 800oC in comparison with IN 740H alloy. Like other superalloys, the tensile properties of the..... More

                   Web of Science 3  Crossref 5
Evaluation of Tensile Properties and Microstructure of a Scraped Gas Turbine Blade using Miniature Specimens
미소 시편을 이용한 가스터빈 블레이드 사용품의 인장 및 미세조직 특성평가
Youngdae Kim, Yinsheng He, Jiye Bang, Jinesung Jung
김영대, 하인생, 방지예, 정진성
Korean J. Met. Mater. 2022;60(11):865-871.   Published online 2022 Oct 31
DOI: https://doi.org/10.3365/KJMM.2022.60.11.865

Abstract
A gas turbine (GT) blade is a key hot-pass component for advanced GT engines, and should have stable properties under extreme conditions of 1,350°C and 3,600rpm, etc. The GT blade, after operating with nearly 800 equivalent start-stops (ES) or 24,000 equivalent operation hours (EOH), should be replaced due to degradation..... More

                   Web of Science 1  Crossref 2
Influence of Trace Amounts of Sulfur on the Microstructure and Mechanical Properties of Directionally Solidified Ni-Based Superalloy GTD-111
일방향응고한 GTD-111 초내열합금의 황 함량에 따른 미세조직 및 고온 기계적 특성
Dong-Soo Kang, Hyungsoo Lee, Dae Won Yun, Hi Won Jeong, Young-Soo Yoo, Seong-Moon Seo
강동수, 이형수, 윤대원, 정희원, 유영수, 서성문
Korean J. Met. Mater. 2022;60(10):782-792.   Published online 2022 Sep 29
DOI: https://doi.org/10.3365/KJMM.2022.60.10.782

Abstract
The influence of trace amounts of sulfur (S) on the microstructural evolution, tensile and creep properties in directionally solidified (DS) Ni-based superalloy GTD-111 were systematically investigated. Doping of S in the range of < 1 to 154 ppm resulted in the formation of a Ti2SC-type carbosulfide phase near the coarse..... More

                   Crossref 2
Evaluation of Liquation Cracking Susceptibility of CM247LC Superalloy Repair Welds via Pre-Weld Varestraint Test
Pre-weld Varestraint 시험을 이용한 CM247LC 초내열합금 보수용접부 액화균열 민감도 평가
Ye-Seon Jeong, Jingon Jeong, Se-Yun Kim, Sung-Hwan Bae, Uijong Lee, Hyungsoo Lee, Seong-Moon Seo, Eun-Joon Chun
정예선, 정진곤, 김세윤, 배성환, 이의종, 이형수, 서성문, 천은준
Korean J. Met. Mater. 2022;60(4):272-281.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.272

Abstract
In this study, the liquation cracking susceptibility in the heat-affected zone of CM247LC superalloy gas turbine blades during repair welding was quantitatively evaluated using a newly developed pre-weld Varestraint test method. The repair welding geometry was replicated through Varestraint tests for the pre-weld bead. The liquation cracking susceptibility, that is,..... More

                   Web of Science 3  Crossref 5
Evaluation and Control of Liquation Cracking Susceptibility for CM247LC Superalloy Weld Heat-Affected Zone via Visualization-Based Varestraint Test
가시화 기반 Varestraint 시험을 이용한 CM247LC 초내열합금 용접 열영향부의 액화균열 민감도 평가 및 제어
Ye-Seon Jeong, Kyeong-Min Kim, Hyungsoo Lee, Seong-Moon Seo, Eun-Joon Chun
정예선, 김경민, 이형수, 서성문, 천은준
Korean J. Met. Mater. 2021;59(7):445-458.   Published online 2021 Jun 11
DOI: https://doi.org/10.3365/KJMM.2021.59.7.445

Abstract
The metallurgical aspects of weld cracking in Ni-based superalloys remain relatively unexplored in existing research. The present study performed comprehensive metallurgical and manufactural investigations into the weldability of an Ni-based superalloy, CM247LC, from the viewpoint of the liquation cracking behavior and its susceptibility. Metallurgical solutions to suppress the liquation-cracking susceptibility..... More

                   Web of Science 2  Crossref 5
Evaluation of Liquation Cracking Behavior and Susceptibility in Heat-Affected Zone of CM247LC Superalloy Welds for Turbine Blade Application
CM247LC 초내열합금 터빈 블레이드 용접 열영향부의 액화균열 발생 거동 및 민감도 평가
Ye-Seon Jeong, Kyeong-Min Kim, Uijong Lee, Hyungsoo Lee, Seong-Moon Seo, Eun-Joon Chun
정예선, 김경민, 이의종, 이형수, 서성문, 천은준
Korean J. Met. Mater. 2020;58(12):875-886.   Published online 2020 Dec 4
DOI: https://doi.org/10.3365/KJMM.2020.58.12.875

Abstract
In this study, the weldability of the as-cast CM247LC superalloy for turbine blade applications was metallurgically evaluated in terms of its hot cracking behavior and susceptibility. For this purpose, a real blade was manufactured using a directional solidification casting process, and gas tungsten arc welding was performed at the tip..... More

                   Web of Science 8  Crossref 10
Effect of Strain Rate and Loading Direction on the Mechanical Properties of Ni-Cr-Al Superalloy Foam Fabricated by Powder Alloying Method
분말 합금법으로 제조된 Ni-Cr-Al 초합금 다공체의 인장 특성에 미치는 변형률 속도 및 하중 방향 효과
Kyu-Sik Kim, Jung-Suk Bae, Jae-Sung Oh, Kee-Ahn Lee
김규식, 배정석, 오재성, 이기안
Korean J. Met. Mater. 2020;58(6):375-382.   Published online 2020 May 20
DOI: https://doi.org/10.3365/KJMM.2020.58.6.375

Abstract
The powder-alloyed metallic sheet foam manufacturing process has the advantage of being able to control pore shape, size, and distribution more easily and homogeneously than conventional foam manufacturing processes. The effects of strain rate and tensile direction on the mechanical properties of Ni-Cr-Al superalloy foam fabricated by powder alloying method..... More

                   Web of Science 1  Crossref 1
Asymmetry in the Mechanical Properties of Block Ni-Cr-Al Superalloy Foam Fabricated by the Combination of Powder Alloying and Hot Rolling Processes
분말 합금법 및 고온 압연 공정으로 제조된 대형 블록 Ni-Cr-Al 초합금 다공체의 기계적 특성 비대칭성
Kyu-Sik Kim, Min-Chul Shim, Man-Ho Park, Jung-Yeul Yun, Kee-Ahn Lee
김규식, 심민철, 박만호, 윤중열, 이기안
Korean J. Met. Mater. 2020;58(2):103-111.   Published online 2020 Jan 8
DOI: https://doi.org/10.3365/KJMM.2020.58.2.103

Abstract
A block Ni-Cr-Al superalloy foam with dimensions of 300 mm (width direction, WD) × 500 mm (rolling direction, RD) × 60 mm (normal direction, ND) was fabricated using powder alloying, multi-sheet stacking, and hot rolling processes. The structural characteristics, microstructure, and mechanical asymmetry of the block Ni-based foam were investigated...... More

                
Microstructural Evolution with Solidification Rate and Heat-Treatment of Single Crystal Superalloy CMSX-4 Grown using Seed
Seed를 이용한 단결정 초내열합금 CMSX-4에서 응고속도 및 열처리에 따른 미세조직 변화
Suncheol Kwon, Jongho Shin, Geunyoung Rim, Gitae Sung, Byunggwan Yoon, Euisuk Jung, Jehyun Lee
권순철, 신종호, 임근영, 성기태, 윤병관, 정의석, 이재현
Korean J. Met. Mater. 2018;56(10):745-754.   Published online 2018 Oct 5
DOI: https://doi.org/10.3365/KJMM.2018.56.10.745

Abstract
The CMSX-4 superalloy including refractory elements was directionally solidified using the seed of a [001] single crystal to control the growth direction to [001], where solidification velocity was changed from 25 to 160 μm/s. In the log-log plot between spacing and solidification velocity, the primary dendrite arm spacing and secondary..... More

                   Crossref 3
Prediction of Primary Dendrite Arm Spacing with Solidification Velocity and Temperature Gradient during Directional Solidification in CMSX-4 Superalloy
CMSX-4 초내열합금에서 일방향 응고속도와 온도경사의 변화에 따른 1차 수지상 간격 예측
Jongho Shin, Changhoon Sung, Suncheol Kwon, Sukhwan Kwon, Byungmoon Chang, Jehyun Lee
신종호, 성창훈, 권순철, 권석환, 장병문, 이재현
Korean J. Met. Mater. 2018;56(9):674-679.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.674

Abstract
Directional solidification experiments were carried out to estimate the effect of solidification velocity and temperature gradient on primary dendrite arm spacing (PDAS) in the Ni-based superalloy, CMSX-4 alloy. The specimens were solidified at velocities of 1, 5, 25, 50 and 100 mm/s under given temperature gradients of 12.5, 18, 23..... More

                   Crossref 2
Microstructure Evaluation and Low Cycle Fatigue Damage due to Degradation of Ni-based Superalloy
니켈기 초내열합금의 열화에 따른 미세구조 및 저주기 피로손상도 평가
Inkang Heo, Donghyun Yoon, Sanghyun Hong, Jinyeol Kim, Jaehoon Kim, Sungho Chang, Siyeon Bae
허인강, 윤동현, 홍상현, 김진열, 김재훈, 장성호, 배시연
Korean J. Met. Mater. 2018;56(8):561-569.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.561

Abstract
Nickel-based superalloys have excellent resistance to extreme environments such as high temperature and high stress and are used as materials for large gas turbines. In this paper, specimens were taken from a blade that had been used for a long time, and their life span was studied by analysis of microstructure...... More

                   Crossref 3
Characterization of Microstructures and Creep Fracture Characteristics of Dissimilar Metal Welds between Inconel 740H Ni-Based Superalloy and Gr.92 Ferritic Steel
니켈기 Inconel 740H 초내열합금과 고Cr계 Gr.92 내열강의 이종금속 용접부의 미세조직 및 크리프 파단 특성
Kyeong-Yong Shin, Ji-Won Lee, Jung-Min Han, Kyong-Woon Lee, Byeong-Ook Kong, Hyun-Uk Hong
신경용, 이지원, 한정민, 이경운, 공병욱, 홍현욱
Korean J. Met. Mater. 2018;56(5):375-383.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.375

Abstract
Microstructure evolution and the creep fracture characteristics of dissimilar welds between Ni-based superalloy Inconel 740H and High Cr ferritic steel Gr.92 were investigated. The dissimilar welds were fabricated by shielded metal arc (SMA) welding process with Ni-based austenitic Inconel 182 superalloy. Postweld heat treatment at 760 oC for 4 hours..... More

       Crossref 6
Growth Rate of Gamma Prime Precipitates in Ni-Base Superalloy
니켈기 초내열합금의 감마프라임상의 성장거동
Junhyeob Oh, Daeyoung Jo, Hongkyu Kim, Jondo Yun
오준협, 조대영, 김홍규, 윤존도
Korean J. Met. Mater. 2018;56(1):8-13.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.8

Abstract
The mechanical properties of nickel-base superalloys used in disk and blade materials for gas turbine engines can be maximized by controlling their microstructure, such as the size of precipitates. In this study, we investigated the size of gamma prime precipitates after age hardening heat treatment at 650-980 oC for 1-48..... More

       Crossref 2
Numerical and Experimental Analysis on the Cavity Formation and Shrinkage for Investment Cast Alloy 738 4 mm-Thick Rectangular Tube
Alloy 738 초내열합금 4 mm 두께 각관의 정밀주조 시 수축공 및 수축변위 해석 및 분석
Myeong-Il Park, Kyeong-Min Kim, Yeong-Chul Lee, Jung-Seok Lee, Jae-Hyun Lee, Jae-Hyun Yoo, Sang-Hu Park, Yoon Suk Choi
박명일, 김경민, 이영철, 이정석, 이재현, 유재현, 박상후, 최윤석
Korean J. Met. Mater. 2017;55(2):132-138.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.132

Abstract
Investment casting for the thin (4 mm thick) rectangular tube (40 mm wide, 80 mm high and 200 mm long) was carried out numerically and experimentally for Alloy 738, which is a precipitation-hardened Ni-base superalloy. Two types of rectangular tubes, one with a regular array (10 mm by 10 mm..... More

    
Evolution of the Solidification Microstructures in Directionally Solidified CM247LC Rod
CM247LC 초내열합금에서 일방향응고에 따른 응고조직 변화
Jeongseok Lee, Seokhwan Kown, Byunggwan Yoon, Byungmoon Chang, Yongil Jung, Jehyun Lee
이정석, 권석환, 윤병관, 장병문, 정연길, 이재현
Korean J. Met. Mater. 2016;54(11):838-845.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.838

Abstract
Directional solidification of CM247LC was performed at a constant growth velocity (300 mm/h) using a Bridgman type furnace. Microstructural features, including the number of grains, PDAS, and EBSD IPF map, were investigated with progressive positions from the starter block. As directional solidification proceeded, the number of grains decreased and PDAS..... More

       Crossref 4
Effect of Second Aging Treatment on the Microstructure and Mechanical Properties of SUH660 Alloy
SUH660합금의 미세조직 및 기계적 특성에 미치는 2차 시효 열처리의 영향
Do-Hoon Kim, You-Hwan Lee, Jeoung Han Kim
김도훈, 이유환, 김정한
Korean J. Met. Mater. 2016;54(10):716-722.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.716

Abstract
nSUH660 is a precipitation hardening stainless steel which has high strength at moderately high temperature. In this study, the effect of a secondary aging-treatment after the standard 720 °C heat-treatment was investigated. The Rockwell C hardness test with detailed TEM observerations was performed to study the steel’s hardening mechanism. The..... More

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