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Development of Highly Machinable Ti Alloy with Exceptional Tensile Properties by Er Alloying Element Addition
Er 합금 원소 첨가를 통한 인장 물성과 절삭성이 우수한 Ti 합금 개발
Yi Seul Choi, Jeong Mok Oh, Chan Hee Park, Wook Jin Lee, Yong ho Park, Jong Woo Won
최이슬, 오정목, 박찬희, 이욱진, 박용호, 원종우
Korean J. Met. Mater. 2024;62(3):171-179.   Published online 2024 Mar 5
DOI: https://doi.org/10.3365/KJMM.2024.62.3.171

Abstract
This study demonstrates that the addition of the rare earth element Erbium (Er) significantly enhances the machinability and tensile properties of titanium (Ti). Pure Ti alloys and Er-added Ti alloys with 0.5-1.1 wt.% Er content were prepared, and their microstructure, machinability, and tensile properties were compared. Two different types of..... 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 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 Mg Content and Cooling Rate After Solidification on the Mechanical Properties of T5-treated Al-Si-Mg Alloy
Al-Si-Mg합금에서 Mg함량과 주조응고 후 냉각속도가 T5 처리시 기계적 특성에 미치는 영향
Hyeon-Woo Son, Tae-Min Koo, Young-Hee Cho, Jung-Moo Lee
손현우, 구태민, 조영희, 이정무
Korean J. Met. Mater. 2023;61(7):472-479.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.472

Abstract
The effects of Mg content and cooling rate on the T5 treatment of Al-Si-Mg alloys have been investigated using Avrami kinetics and transmission electron microscopy. The alloys were super-heated at 800 oC for 1 hr followed by degassing treatment at 720 oC for 15 min, and poured into a metallic..... More

                   Web of Science 2  Crossref 3
Effect of Precipitates and Cold Working on the Reheat Cracking of STS 347 Austenitic Stainless Steel
STS 347 오스테나이트계 스테인리스강의 재열균열에 미치는 석출물과 냉간 가공의 영향
Il Yoo, Seok-Woo Ko, Jaeyun Kim, Byoungchul Hwang
유일, 고석우, 김재윤, 황병철
Korean J. Met. Mater. 2022;60(2):102-113.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.102

Abstract
The aim of this study was to investigate the effect of precipitates and cold working on the reheat cracking of STS 347 austenitic stainless steel. Three different heat treatments to form NbC and M23C6 precipitates were applied to the STS 347 austenitic stainless steel and 10% pre-strain was additionally introduced..... More

                   Web of Science 2  Crossref 2
Effects of Initial Precipitate on Shear Deformation during Asymmetric Rolling of Al-Mg-Si Alloy: Texture and Formability
Al-Mg-Si 합금의 초기 석출물이 비대칭 압연에 의한 전단변형에 미치는 영향 : 집합조직과 성형성
Wonkee Chae, Bong-Kyu Kim, Jongbeom Lee, Jun Hyun Han
채원기, 김봉규, 이종범, 한준현
Korean J. Met. Mater. 2020;58(10):703-714.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.703

Abstract
Al-Mg-Si alloy was rolled asymmetrically at several temperatures to apply shear deformation, and the effects of the initial precipitate on shear deformation, texture evolution, formability, and plastic anisotropy were studied. Texture was analyzed using a EBSD, and the formability and plastic anisotropy of the specimen were evaluated using the value..... More

                   Web of Science 8  Crossref 8
Effect of Carbides Formed in 9Cr-1Mo-V-Nb Weld Metals on Elevated Temperature Tensile Strength
9Cr-1Mo-V-Nb 용착금속에서 생성된 탄화물이 고온 인장강도에 미치는 영향
Byungrok Moon, Junghoon Lee, Namhyun Kang, Taeho Lee, Woosang Jung, Chulgyu Park, Kyungmox Cho
문병록, 이정훈, 강남현, 이태호, 정우상, 박철규, 조경목
Korean J. Met. Mater. 2019;57(7):422-429.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.422

Abstract
Alloy design of 9Cr-1Mo-V-Nb weld metals was carried out through thermodynamic simulation, and elevated temperature tensile testing was performed on the designed alloy. Based on the thermodynamic simulation of the 9Cr-1Mo-V-Nb weld metal, 0.09 to 0.10 wt% C was added to increase Cr-rich M23C6. Nitrogen was reduced from 0.04 to..... More

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