本文研究了30CrMnsiNi2A钢在马氏体区不同温度等温淬火对钢组织和性能的影响,从应力腐蚀、低周疲劳、断裂韧性、断口特征和常规机械性能的综合考虑来确定最佳等温淬火工艺.试验结果表明,285℃等温淬火280℃回火的热处理工艺可以获得比较良好的综合性能,并且认为下贝氏体和残留奥氏体是使该钢的韧性和塑性提高的主要因素,而回火马氏体则是保证钢的强度的重要因素.
An investigation was made of the effect of the isothermal quenching at dif-ferent temperatures in the martensitic range on the structure and properties of 30CrMnSiNi2A steel.To sum up the results from the tests of stress corrosion,lowcyclic fatigue,fracture toughness,fracture feature and conventional mechanicalproperties,the optimum isothermal quenching regime was ascertained.Experimentalresults show that the superior comprehensive properties of the steel may be ob-tained by treatment of isothermal quenching at 285℃ then tempering at 280℃.It is believed that the lower bainite and residual austenite are the chief factors inimprovement of toughness and plasticity of the steel,however,the tempered mar-tensite is an important factor to ensure its high strength.
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