Peak temperature and cooling rate effects on M–A constituent characteristics in the ICCGHAZ of HSLA steels: a review

The intercritically reheated coarse-grained heat-affected zone (ICCGHAZ) is critical to the structural integrity of high-strength low-alloy (HSLA) steels . A contributing factor to this is the formation of the martensite-austenite (M-A) constituent. However, the effect of M-A on mechanical properties depends on its characteristics, which can be readily modified by the welding thermal cycle. In this context, this work presents a literature review on the effects of the intercritical peak temperature (Tp 2 ) and cooling rate on the formation and characteristics of the M-A constituent in the ICCGHAZ of HSLA steels. Based on the information gathered, it was possible to note that variations in the Tp 2 and the cooling rate have shown different influences on the aspects of the M-A constituent, with distinct implications for the material properties, particularly toughness. The data compiled in this article can assist researchers and industry professionals in optimizing processing variables, leading to ICCGHAZs with improved properties that enhance the safety of HSLA steels in service.