Niフリー調質高張力鋼の再熱割れ感受性に及ぼすHAZ組織の影響(溶接・接合)

概要

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Relation between reheat cracking susceptibility and HAZ microstructure on Ni-free high strength steels were investigated. In this experiment, HAZ microstructure obtained by synthetic-weld heat treatment was researched from relationship between stress relaxation behavior and high temperature properties. Interaction between reheat cracking susceptibility and Post-weld heat treatment (PWHT) was investigated. As a result, from results of stress relaxation test, both specimens (N1 and N2) show the same tendency and reheat cracking of all HAZ microstructure was occurred. Second, results of Constant-load teat on heating, each HAZ microstructure of both specimen was strongly embrittled from 830 to 900K and gained less 5% obtained by reduction of area. Each bainitic structure of both steel (N1 and N2) was different of ratio of bainitic type structure in spite of same cooling rate. Different of an amount of Mo (0.2 mass%) were not influenced by reheat cracking susceptibility.
2004-07-01