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研究了一种高强度马氏体时效不锈钢逆转变奥氏体再结晶规律、细化晶粒工艺及细晶组织对力学性能的影响。研究表明,通过循环相变α′γ可得到7μm的等轴晶粒,新生晶粒内的板条马氏体块又重新被分割而成为若干个亚晶粒,同时部分单一的马氏体板条束又被夹角略大于60°方向上的若干个小马氏体板条束所分割,从而进一步细化了马氏体组织;与传统热处理工艺1 050℃×1 h相比,在同样时效处理规程下进行时效处理,钢的屈服强度提高了130 MPa,A、Z分别提高了7.5%、11%,循环相变细化晶粒是同时提高该钢的强度和韧塑性的有效手段。
The effect of austenite recrystallization on the austenitizing aging behavior of high strength martensitic stainless steel was studied. The effects of grain refinement process and microstructure on the mechanical properties were studied. The results show that equiaxed grains of 7μm can be obtained by cyclic transformation α’γ, and the lath martensite blocks in the new grains are subdivided into several subgrains. At the same time, part of the single martensite sheet The bundles were further segmented by a number of small martensite laths bundled in a direction slightly larger than 60 ° to further refine the martensite structure. Compared with the conventional heat treatment process at 1,050 ° C × 1 h, Aging treatment regulations aging treatment, the yield strength of steel increased by 130 MPa, A, Z increased by 7.5%, 11%, respectively, the cycle of phase change grain refinement is an effective means to improve the strength and toughness of the steel.