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本文研究了形变热处理对00Cr12Ni9Cu2TiNbBeXt马氏体时效不锈钢组织特征的影响。实验结果表明,形变热处理后马氏体的位错密度增加,并有胞状亚组织形成,它们分布于板条马氏体内或跨越马氏体条边界。随着轧制变形量的增加,马氏体块和板条宽度减小,胞状亚组织细化;马氏体块与轧制方向的锐角减小,且其夹角与变形量呈线性关系。当始轧温度降低时,马氏体块和板条宽度以及胞状亚组织尺寸都减小。时效后的析出相主要是棒状NuTi相,它们沿马氏体基体(111)方向交错排列,平面形貌为“人字形”花样的有序排列。当变形量增加或始轧温度降低时,析出相的体积分数和弥散度均增加。高温中等变形量轧制可获得最佳强韧化的组织,从而得到优异的综合力学性能。
In this paper, the effect of thermomechanical treatment on the microstructures of 00Cr12Ni9Cu2TiNbBeXt martensitic stainless steel was studied. The experimental results show that the dislocation density of martensite increases after deformation and heat treatment, and the formation of cellular sub-organization, which are distributed in the lath martensite or across the martensite boundary. With the increase of rolling deformation, the width of martensite block and slab decreases, and the cellular sub-structure is refined. The acute angle of martensite block and rolling direction decreases, and the angle between the martensite block and the slab decreases linearly. When the initial rolling temperature decreases, the martensite bulk and slat width and the size of cellular sub-organization are reduced. The precipitated phases after aging are mainly rod-shaped NuTi phases, which are staggered along the direction of the martensite matrix (111), and the plane topography is an ordered arrangement of “chevron” patterns. When the amount of deformation increases or the initial rolling temperature decreases, the precipitated phase volume fraction and dispersion increase. High temperature deformation of the amount of rolling the best strength and toughness of the organization to obtain excellent overall mechanical properties.