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采用光学显微镜、EBSD测试技术和三维原子探针分别对超低碳烘烤硬化钢的微观组织、织构以及固溶元素进行分析。结果表明,超低碳烘烤硬化钢经过750～810℃退火后,退火组织均为等轴状的铁素体组织,退火织构主要为{111}有利织构。随着退火温度的增加,其晶粒尺寸和{111}织构的强度都不断增大。烘烤硬化钢板经过退火后碳和磷元素在晶界等缺陷处发生了不同程度的偏聚。通过三维原子探针相应的软件计算得出,固溶在钢中的含碳量随着退火温度的增加而增大。
The microstructure, texture and elemental analysis of ultra-low carbon bake hardened steel were analyzed by optical microscope, EBSD test and three-dimensional atom probe respectively. The results show that the annealed microstructure of the ultra - low carbon bake hardened steels annealed at 750 ~ 810 ℃ are equiaxed ferrite, and the annealed texture is mainly {111} textured. With the increase of annealing temperature, the grain size and the strength of {111} texture are continuously increasing. Bake hardened steel after annealing carbon and phosphorus elements in grain boundaries and other defects occurred at different degrees of segregation. Calculated by the corresponding software of the three-dimensional atom probe, the carbon content of the solid solution in the steel increases with the increase of the annealing temperature.