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本文测定了30CrMnSiNi2A钢等温淬火后Ar回火动力学,进行回火组织的动、静态观察并研究了该钢的回火脆性和Ar的稳定性。结果表明:等温淬火后Ar的C曲线上支对应上(或反)贝氏体转变,下支对应下贝氏体或等温马氏体转变;热处理制度可以控制Ar的稳定性;Ar分解为上(或反)贝氏体、断续碳化物膜和回火冷却及形变时转变为马氏体是引起回火脆性的重要因素(特别是对含Ar较多的组织)。等温淬火后工件宜在250～300℃回火。
In this paper, the kinetics of Ar tempering after isothermal quenching of 30CrMnSiNi2A steel has been measured. The dynamic and static observation of tempering structure has been carried out and the temper embrittlement and Ar stability have been studied. The results show that the upper C branch of Ar undergoes the transformation of upper (or opposite) bainite and the lower branch corresponds to the transformation of lower bainite or isothermal martensite after the isothermal quenching. The heat treatment system can control the stability of Ar. (Or anti) bainite, intermittent carbide film and tempering cooling and deformation into martensite is caused by tempering brittleness is an important factor (especially for more Ar-containing tissue). After isothermal quenching the workpiece should be tempered at 250 ~ 300 ℃.