In Situ Observation of Phase Transformations in the Coarse-Grained Heat-Affected Zone of P91 Heat-Resistant Steel During Simulated Welding Process

被引：0
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作者：
Yang Shen
Bo Chen
Cong Wang
机构：
[1] Northeastern University,School of Metallurgy
[2] University of Leicester,School of Engineering
来源：
Metallurgical and Materials Transactions A | 2020年 / 51卷
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摘要：
The solid-state phase transformation in the coarse-grained heat-affected zone of P91 steel under simulated welding thermal cycle has been investigated in situ by confocal scanning laser microscope. It is found that γ-austenite initiates from the triple point of δ-ferrite grain boundaries (GBs), then at ordinary δ-GBs, and eventually from grain interiors. Upon further cooling, martensite laths are observed to nucleate and growth instantaneously, with the growth rate being estimated ranging from 175 to 454 μm/s.
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页码：3371 / 3376
页数：5
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