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Metals 2018, 8(8), 638; https://doi.org/10.3390/met8080638

Effect of Martensite–Austenite Constituent on Low-Temperature Toughness in YS 500 MPa Grade Steel Welds

1
Department of Material Science and Engineering, Pusan National University, Busan 46241, Korea
2
Technical Research Center, Hyundai steel Company, Chungnam 31719, Korea
3
Material Development team, Samhaw Steel Company, Busan 47018, Korea
4
Dongnam Regional Division, Korea Institute of Industrial Technology, Busan 46742, Korea
5
Department of Advanced Material Engineering, Dong-eui University, Busan 47227, Korea
*
Author to whom correspondence should be addressed.
Received: 2 July 2018 / Revised: 3 August 2018 / Accepted: 8 August 2018 / Published: 14 August 2018
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Abstract

The effect of martensite–austenite (M–A) constituents and simulated microstructure on low-temperature toughness was investigated in YS 500 MPa grade structural steel welds. The specimens were fabricated using a direct quenching and tempering process. After simulated weld thermal cycles, the coarse-grained heat-affected zone (CGHAZ) and intercritically reheated coarse-grained heat-affected zone (IRCGHAZ) were produced using a Gleeble tester and real welded joint to support the simulation results. The largest low-temperature toughness was observed in the fine-grained heat-affected zone (FGHAZ) owing to the fine-ferrite microstructure. However, the toughness decreased in the IRCGHAZ because of the slender morphology of the M–A constituents that formed primarily along the prior austenite grain boundaries in the IRCGHAZ. View Full-Text
Keywords: heat-affected zone; M–A constituent; submerged arc welding; IRCGHAZ; slender M–A heat-affected zone; M–A constituent; submerged arc welding; IRCGHAZ; slender M–A
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kim, I.; Nam, H.; Lee, M.; Nam, D.; Park, Y.; Kang, N. Effect of Martensite–Austenite Constituent on Low-Temperature Toughness in YS 500 MPa Grade Steel Welds. Metals 2018, 8, 638.

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