Heat-Affected Zone Characteristics with Post-Weld Heat Treatments in Austenitic Fe–Mn–Al–C Lightweight Steels

Seonghoon Jeong; Gitae Park; Bongyoon Kim; Joonoh Moon; Seong‑Jun Park; Changhee Lee

doi:10.1007/s12540-021-01133-0

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자료유형: 학술저널

저자정보: Seonghoon Jeong (Hyundai Steel Company) Gitae Park (Hanyang University) Bongyoon Kim (Hanyang University) Joonoh Moon (Korea Institute of Materials Science) Seong‑Jun Park (Korea Institute of Materials Science) Changhee Lee (Hanyang University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.10

발행연도: 2022.10

수록면: 2,371 - 2,380 (10page)

DOI: 10.1007/s12540-021-01133-0

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This study investigates the relationship between the mechanical characteristics and microstructural transitions in heat-affectedzone (HAZ) of various austenitic Fe–Mn–Al–C lightweight steels. The analysis was conducted on the simulated HAZ sampleswith various post-weld heat treatment (PWHT) conditions. The base steel was prepared via vacuum induction melting, hotrolling, and solution treatment prior to water quenching. Gleeble simulator was used to manufacture the simulated HAZs, andthe samples were subjected to PWHT with various durations by electric furnace. To understand the effects of thermal historyon the mechanical characteristics, ultimate tensile tests, micro-hardness tests, and cryogenic Charpy impact toughness testswere conducted, and microstructural analyses were conducted by optical microscopy, scanning electron microscopy, X-raydiffraction analysis, and transmission electron microscopy. The experimental results confirmed the influence of Al contenton the austenitic Fe–Mn–Al–C lightweight steels, which promotes κ-carbide precipitation, both in the austenite matrix andgrain boundaries, thereby increasing the strength and hardness while decreasing the ductility and toughness. Each mechanicalproperty showed a linear relationship with the growth kinetics of the κ-carbide particles. However, abnormal coarsening ofthe inter-granular κ-carbide during welding and PWHT caused severe embrittlement, regardless of thermal history, by actingas inter-granular crack propagation channels. The experimental results suggest that Fe–Mn–Al–C lightweight steels shouldbe developed with controlling the alloying elements to overcome HAZ discontinuity and mechanical property degradationoccurring by intra- and inter-granular κ-carbide precipitation.

#Lightweight steel · Welding · Heat-affected zone · Post-weld heat treatment · Mechanical property · κ-carbide

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