摘要
钢中残余奥氏体发生应变诱发马氏体相变的百分量与拉伸应变量的对数呈线性关系,用其斜率的倒数 K。值可表示残余奥氏体机械稳定性的大小。本文研究了残余奥氏体的强韧化机理。残余奥氏体发生应变诱发马氏体相变吸收能量是提高钢冲击韧性的主要原因。在低碳贝氏体钢中,增加以 M-A 岛形式存在的残余奥氏体的数量及其机械稳定性,可使 M-A 岛的体积分数增多,强度增加,从而提高了钢的强度。
A linear dependence of percent of strain induced martensite tran- sformation of the retained austenite in the steel upon tensile strain is estab- lished.The mechanical stability of retained austenite can be indicated by Ks,the reciprocal of the straight line slope.The strength-toughening mecha- nism of the retained austenite has been studied.The main reason for improving charpy impact toughness is that the retained austenite absorbs energy in strain induced martensite transformation.In low carbon bainitic steels,the strength is improved because the volume fraction and strength of M-A island is increased by the amount and mechanical stability of retained austenite in M-A island.
关键词
残余奥氏体
机械稳定性
强韧性
retained austenite
machanical stability
strength and toughness
