实验考察各种强韧化热处理工艺对30CrMnSiA钢抗氢脆性能的影响。结果表明,在900℃淬火和500℃回火之间,采用(Ac_3-10℃)亚温淬火、(Ac_3+20℃)两次淬火可使调质状态钢的氢脆断裂下临界应力σc值分别提高9.6%和7.9%。等温淬火后在再进行Ac_3+20℃两次淬火可使钢的σc值提高10.4%。370等温淬火工艺可使板状缺口试样钢的σc值提高60%。钢的抗氢脆能力的提高是由于存在一定量韧性相铁素体或残余奥氏体,提高了基体组织的塑性和韧性。晶粒细化、α相和γ相由块状改变为针状、碳化物弥散细小地分布以及吸氢量减少也是氢脆敏感性降低的原因。
The effect of various heat treatment on hydrogen embrittlement resis tance of 30CrMnSiA steel has been studied experimentally.The results show that the application of sub-critical quenching at(Ac_3-10℃)or twice quenching at(Ac_3+20℃),between quenching at 900℃ and temp ering at 500℃,can raise the critical stress óc of the steel in tempered sorbite condition to hydrogen embrittlement by 9.6% and 7.9% respec- tively.Twice quenching at(Ac_3+20℃)after isothermal quenchnig can raise óc by 10.4%.Isothermal quenching at 370℃ can raise óc of plaet- notched specimens by 60%.The increase of the hydrogen embrittlement resistance is attributed to the fact that the existence of tough ferrite or retained austenite raises the plasticity and toughness of the matrix. The refining of grains,the change of α and β phases from lump to needle shape,the refining of dispersal carbide and the reduction of absorbed hydrogen content are also responsible for the reduction of he suscep- tibility to hydrogen embrittlement.
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