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对超低碳钢进行了标准单向拉伸和宽板单向拉伸预应变方式下的烘烤硬化处理,测试了不同预应变方式下的烘烤硬化(BH)值,用透射电镜分析了不同预应变试样内的位错密度,用Ansys软件模拟了不同预应变试样内的应变分布。结果表明,标准单向拉伸时,BH值随着预应变量的增加,先增加到最大值后又呈现下降的趋势;而宽板拉伸时,BH值随着预应变量的增加变化不大;在预应变量相同时,标准单向拉伸试样内的位错密度明显大于宽板拉伸时的位错密度;标准单向拉伸试样标距内的应变均匀且与实际外加应变相差较小,而宽板试样标距内的应变不均匀且与实际相差很大。
The ultra-low carbon steels were subjected to the standard biaxial stretching and wide-plate uniaxial tensile pre-strain bake hardening process, the bake hardening (BH) values under different pre-strain modes were tested, and the transmission electron microscope The dislocation density in different pre-strain specimens was simulated by Ansys software in different pre-strain specimens. The results show that the BH value increases first and then decreases with the increase of the pre-strain when the specimen is uniaxially stretched. However, the BH value does not change with the increase of the pre-strain when the specimen is stretched The dislocation density in the standard unidirectional tensile specimen is obviously greater than the dislocation density in the tensile specimen with the same pre-strain; the strain in the standard unidirectional tensile specimen is uniform and the difference with the actual addition The difference of strain is small, while the strain in wide gauge specimen gauge is not uniform and varies greatly with the actual strain.