循环相变对00Cr13Ni7Co5Mo4Ti马氏体时效不锈钢晶粒细化和力学性能的影响

研究了00Cr13Ni7Co5Mo4Ti马氏体时效不锈钢（/%:0.009C、13.28Cr、7.37Ni、5.36Co、3 59Mo、0.66Ti）经4次860℃15 min水冷循环处理的细化晶粒工艺对力学性能的影响。以1 100℃1 h固溶处理的组织为原始组织,经3～4次循环相变处理后,马氏体时效不锈钢的晶粒尺寸由180μm细化至10μm的细小等轴晶粒。与传统1 100℃1 h固溶+450℃9 h时效工艺相比,经1 100℃1 h固溶+860℃15 min水冷α′（?）γ循环相变+450℃9 h时效的钢的屈服强度σ_0.2由1 420 MPa提高至1 560 MPa,伸长率δ由12.6%提高至14.9%。

Effect of Recycling Phase Transformation on Grain Refinement and Mechanical Properties of Maraging Stainless Steel 00Cr13Ni7Co5Mo4Ti

The effect of grain refining process with 4 times 860℃15 min water cooling recycling treatment on mechanical properties of maraging stainless steel 00Cr13Ni7Co5Mo4Ti（/%:0.009C,13.28Cr,7.37Ni,5.36Co,3.59Mo, 0.66Ti） has been studied.Based on the original structure of steel with 1 100℃1 h solid solution treatment,after 3～4 times recycling phase transformation treatment,the grain size of maraging steel refines to 10μm equiaxed fine grains from original 180μm.Compared with traditional 1 100℃1 h solid solution +450℃9 h aging process,with 1 100℃1 h solid solution +860℃15 min water coolingα’（?）γrecycling phase transformation +450℃9 h aging,the yieldσ_0.2 of steel increases to 1 560 MPa from 1 420 MPa and the elongation 8 increases to 14.9%from 12.6%.