18Ni マルエージ鋼の水素脆性におよぼす未再結晶溶体化処理の影響

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The purpose of the present paper is to clarify the influences of grain size of prior-austenite and solution treatment under unrecrystallizing condition for austenite on hydrogen induced grain boundary cracking in 18%Ni maraging steel. The grain size of the prior-austenite in the present alloy was varied from 24 μm to 380 μm by solution treatment under recrystallizing condition at appropriate temperatures from 1153 K to 1473 K. The crack growth rate was measured under the condition of sustained load in an environment of hydrogen cathodically charged in a 0.5% sulfuric aqueous solution. The crack growth rate of the specimen solution-treated under recrystallizing condition was strongly dependent on the grain size of the prior-austenite. The larger grain size was, the larger crack growth rate became. Unrecrystallization solution treatment, however, decreased the crack growth rate drastically down to the same level as the specimen with 24 μm in grain size solution-treated under recrystallizing condition. Consequently, the dependence of crack growth rate on grain size of prior-austenite was not appreciated distinctly for specimens resolution-treated under unrecrystallizing condition. It was elucidated that the unrecrystallization solution treatment as well as refining of prior-austenite grain size retarded the enrichment of hydrogen at prior-austenite grain boundary by way of an increase in hydrogen trapping sites resulting from refining of martensite-block structures.
社団法人日本鉄鋼協会の論文
1987-12-01

18Ni マルエージ鋼の水素脆性におよぼす未再結晶溶体化処理の影響

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