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A Study on the Relationship between Microstructure and Impact Toughness with Different Heat Inputs and Post-Seam Annealing Temperatures in API X70 Electric Resistance Welded Steel Pipe
항복강도 70 ksi급 전기저항용접 강관의 입열량 및 심 어닐링 온도에 따른 미세조직과 저온충격인성 상관관계 고찰
Tae-Hun Kim, Chiwon Kim, Chan-Hee Lee, Jinseop Kwack, Donghyeon Jeon, Hyun-Uk Hong
김태훈, 김치원, 이찬희, 곽진섭, 전동현, 홍현욱
Korean J. Met. Mater. 2023;61(9):659-668.   Published online 2023 Aug 30
DOI: https://doi.org/10.3365/KJMM.2023.61.9.659

Abstract
In this study, the influence of heat input and post-seam annealing (PSA) temperature on the microstructure and impact toughness of electric resistance welded (ERWed) API X70 steel pipe was investigated. The ERW seam welds of pipes were fabricated with low, moderate, and high heat inputs, and followed by the PSA..... More

                
Effect of Cooling Rate on The Microstructure And Cryogenic Impact Toughness of HAZ in 9% Ni Steel
Hae Won Eom, Joo Yeon Won, Sang Yong Shin
엄해원, 원주연, 신상용
Korean J. Met. Mater. 2021;59(11):781-795.   Published online 2021 Oct 28
DOI: https://doi.org/10.3365/KJMM.2021.59.11.781

Abstract
The effects of cooling rate on the microstructure and cryogenic impact toughness of coarse-grained heat-affected zone (CGHAZ) and inter-critically reheated coarse-grained HAZ (IC CGHAZ) in 9% Ni steel were investigated. CGHAZ and IC CGHAZ specimens were prepared from 9% Ni steel by controlling the cooling rate of the simulated welding..... More

                
Influence of Carbon Content and Isothermal Heat Treatment Temperature on the Microstructure and Mechanical Properties of Ultra-High Strength Bainitic Steels
초고강도 베이나이트강의 미세조직과 기계적 성질에 미치는 탄소함량과 항온열처리 온도의 영향
Seung Hwangbo, Hong-Bum Lee, Young-Beum Song, Jinhee Ham, Hong-Kyu Kim, Dong-Woo Suh
황보승, 이홍범, 송영범, 함진희, 김홍규, 서동우
Korean J. Met. Mater. 2019;57(6):335-342.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.335

Abstract
The effect of carbon content and isothermal heat treatment conditions on the microstructure evolution and mechanical properties of ultra-high strength bainitic steels was investigated. A reduction in carbon content from 0.8 wt% to 0.6 wt% in super-bainite steel with typical chemistry effectively improved not only the Charpy impact toughness but..... More

                   Web of Science 1  Crossref 1
Effects of Si on the Characteristics of FCA Multi-Layer Weld Metal with 460 MPa Yield Strength Grade Steels for Ships and Marine Structures
선박 및 해양구조물용 항복강도 460 MPa급 강재의 FCA 다층 용접금속부 특성에 미치는 규소의 영향
Jong-Sig Kim, Myeong-Soo Lee, Jong-Min Jung, Han-Geul Choi, Sang-Hoon Jeong, Chang-Yong Kang
김종식, 이명수, 정종민, 최한글, 정상훈, 강창룡
Korean J. Met. Mater. 2018;56(7):499-504.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.499

Abstract
This study investigated the effect of Si on the characteristics of FCA multi-layer weld metal with 460 MPa yield strength grade steels for ships and marine structures. The effect on microstructure was evaluated by tensile, charpy impact and CTOD testing of 4 FCAW welds containing various C and Si contents...... More

                   Crossref 1
Mechanical Behavior
Sensitivity of Microstructural Factors Influencing the Impact Toughness of Hypoeutectoid Steels with Ferrite-Pearlite Structure using Multiple Regression Analysis
다중회귀분석을 이용한 페라이트-펄라이트 조직 아공석강의 충격인성에 미치는 미세조직적 인자의 민감도 해석
Seung-Yong Lee, Sang-In Lee, Byoungchul Hwang
이승용, 이상인, 황병철
Korean J. Met. Mater. 2016;54(9):637-644.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.637

Abstract
In this study, the effect of microstructural factors on the impact toughness of hypoeutectoid steels with ferrite-pearlite structure was quantitatively investigated using multiple regression analysis. Microstructural analysis results showed that the pearlite fraction increased with increasing austenitizing temperature and decreasing transformation temperature which substantially decreased the pearlite interlamellar spacing and..... More

       Crossref 7
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