Impact of cooling rate on microstructural development and mechanical characteristics of CGHAZ in long-service 15Cr1Mo1V steel post-repair welding

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Increased cooling rates lead to higher hardness, with 60 °C/s resulting in 402 HV0.2 from martensite formation.
Microstructural analysis shows that cooling rates can shift the dominant phase from ferrite to lath martensite as cooling accelerates.
SH-CCT curve development was essential to understanding the transformation dynamics in the CGHAZ of the steel after welding.
The study indicates specific cooling rates yield distinct microstructural phases such as bainite and martensite, impacting mechanical properties.

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Thermal simulation reveals cooling rate affects microstructural composition and hardness in CGHAZ of 15Cr1Mo1V steel.

Li et al. (2025) studied this question.

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