Association of Partial Melting and Hydrogen-Assisted Cracking in Weld Heat-Affected Zone of High Strength Steel (Part 4)
Takehiko Watanabe, Isao Okane
Morphology and locality of sulfide inclusions in HAZ of both HY80 and SM50B steels were observed, and the relation between sulfide inclusions and susceptibility to hydrogen-assisted cracking was examined.
The sulfide inclusions in HAZ of HY80 steel heated to 1450°C were located in the form of array in a rolling direction. The morphology and locality of dotlike sulfide inclusions in HY80 steel HAZ were quite different from those in SM50B steel HAZ heated to 1450°C.
Consequently, it was known that the morphology and locality characteristic of sulfide inclusions seen in HY80 steel HAZ have a close velationship to the high susceptibility to hydrogen-assisted cracking of HY80 steel HAZ.
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MATERIALS TRANSACTIONS Vol.42(2001), No.12