Effect of Initial Microstructure on the Toughness of Coarse-Grained Heat-Affected Zone in a Microalloyed Steel

Shi, Minghao; Di, Man; Zhang, Jian; Kannan, Rangasayee; Li, Jing; Yuan, Xiaoguang; Li, Leijun

doi:10.3390/ma14164760

Effect of Initial Microstructure on the Toughness of Coarse-Grained Heat-Affected Zone in a Microalloyed Steel

Journal Article · Mon Aug 23 00:00:00 EDT 2021 · Materials

DOI:https://doi.org/10.3390/ma14164760· OSTI ID:2471284

Shi, Minghao ^[1]; Di, Man ^[2]; Zhang, Jian ^[3]; ^[4]; ^[5]; Yuan, Xiaoguang ^[2]; ^[5]

Shenyang University of Technology (China); Univ. of Alberta, Edmonton, AB (Canada)
Shenyang University of Technology (China)
Ansteel Beijing Research Institute, Beijing (China)
Univ. of Alberta, Edmonton, AB (Canada); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Alberta, Edmonton, AB (Canada)

Toughness of the coarse-grained-heat-affected-zone (CGHAZ) strongly depends on the prior austenite grain size. The prior austenite grain size is affected not only by chemical composition, thermal cycle, and dissolution of second-phase particles, but also by the initial microstructure. The effect of base metal microstructure (ferrite/pearlite obtained by air cooling and martensite obtained by water-quenching) on Charpy impact toughness of the CGHAZ has been investigated for different heat inputs for high-heat input welding of a microalloyed steel. A welding thermal cycle with a heat input of 100 kJ/cm and 400 kJ/cm were simulated on the MMS-300 system. Despite a similar microstructure in the CGHAZ of both the base metals, the average Charpy impact energy for the air-cooled base metal was found to be higher than the water-quenched base metal. Through thermo-kinetic simulations, it was found that a higher enrichment of Mn/C at the ferrite/austenite transformation interface of the CGHAZ of water-quenched base metal resulted in stabilizing austenite at a lower A1 temperature, which resulted in a coarser austenite grain size and eventually lowering the toughness of the CGHAZ.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0014664

OSTI ID:: 2471284

Journal Information:: Materials, Journal Name: Materials Journal Issue: 16 Vol. 14; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Charpy impact toughness
coarse-grained heat-affected zone
grain boundary ferrite
initial microstructure
prior austenite grain size

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