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| EFFECT OF QUENCHING FROM INTERCRITICAL TEMPERATURE ON HYDROGEN-INDUCED CRACKING IN 30CrMnSiA STEEL |
| Wu Rengeng Li Renshun (Harbin Institute of Technology) |
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Abstract The effect of quenching from intercritical temperature in(α+γ)region on hydrogen-induced cracking of a high strength steel 30CrMnSiA was studied. The results showed that an additional intereritical quenching from 860℃,per- formed between the oil quenching from 900℃ and tempering at 250℃,markedly improved the hydrogen embrittlement resistance of this steel.The minimum stress to hydrogen-induced cracking was increased by several times in steels with tempered martensltebut there was no effect on steel with sorbitic struc- ture having hardness below HRc36.The crack propagation rate of the steels with tempered martensite also decreased due to the intercritical quenching. The microanalyses of fractures with IMA and XPS showed that the segregation of impurities and the elements producing brittle failure at austenite grain boundaries was attenuated to a certain extent by this quenching.It would be bene- ficial for the superior hydrogen embrittlement resistance of the steel.In addition,the presence of minor ferrite and austenite grains refined could could also be helpful.
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Received: 25 February 1984
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