Association of Partial Melting and Hydrogen-Assisted Cracking in Weld Heat-Affected Zone of High Strength Steel (Part 4)
Takehiko Watanabe, Isao Okane
pp. 3-9
DOI:
10.2207/qjjws.1.3Abstract
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