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作者采用透射电镜、扫描电镜和X射线衍射仪等实验设备,研究了55SiMnVB钢在遗传强化处理过程中,中间软化回火对钢中显微组织、位错密度和力学性能的影响。结果表明,高温形变强化效果在相变再结晶过程中的遗传,实际是位错结构与位错密度的遗传;中间软化回火,不仅降低了钢的硬度而便于加工,而且继承了高温形变所产生的位错结构并使其稳定,使高温形变亚结构能够遗传给次生马氏体,从而获得比常规热处理稍高的强度。
The author studied the effects of intermediate softening and tempering on the microstructure, dislocation density and mechanical properties of 55SiMnVB steel in the process of genetic strengthening by using transmission electron microscope, scanning electron microscope and X-ray diffraction. The results show that the inheritance of high temperature deformation strengthening effect during phase transformation recrystallization is actually the inheritance of dislocation structure and dislocation density. The middle softening and tempering not only reduce the hardness of steel and facilitate the processing, but also inherit the high temperature deformation The resultant dislocation structure is stabilized and enables the high-temperature deformable substructure to be inherited to the secondary martensite to achieve slightly higher strength than conventional heat treatment.