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测定了40CrMnsiMoVA钢中残余奥氏体(A_R)的数量,热稳定性和机械稳定性,以及含磷量等在310℃下的等温时间或回火温度的变化规律,观察了A_R的形貌和转变,并着重研究了含碳量对A_R机械稳定性的影响。结果表明,该钢中机械稳定性低的A_R经塑性变形后生成的转变产物是孪晶马氏体。A_R的机械稳定性随其含碳量的提高而提高,且在静态或动态(多冲)拉伸条件下,或在不同变形量条件下的变化规律基本相似。适当的回火是大幅度提高A_R机械稳定性的有效办法。
The quantity, thermal stability and mechanical stability of retained austenite (A_R) in 40CrMnsiMoVA steel were measured. The variation of phosphorus content and isothermal time or tempering temperature at 310 ℃ were observed. The morphology and Change, and focus on the carbon content of A_R mechanical stability. The results show that the transformation product produced by plastic deformation of A_R with low mechanical stability is twin martensite. The mechanical stability of A_R increases with the increase of its carbon content, and the change law of A_R under static or dynamic (multi-stretching) tensile conditions or under different deformation conditions is basically similar. Appropriate tempering is an effective way to greatly improve the mechanical stability of A_R.