弹簧钢55SiCr组织精细结构分析

Analysis of fine microstructure of spring steel 55SiCr

利用电子背散射衍射（EBSD）测试技术对国产和进口两种优质弹簧钢55Si Cr的珠光体团尺寸、分布和轧制织构进行了对比分析。结果表明,两种优质弹簧钢中的珠光体团尺寸细小,平均值在6~8μm;国产优质弹簧钢的珠光体团小于10μm的比例达84%。这两种优质弹簧钢中均有3种晶粒取向存在,即〈101〉、〈001〉和〈111〉,国产优质弹簧钢的晶粒在〈001〉和〈111〉取向附近的比例较高,而进口优质弹簧钢在〈101〉取向上的织构强度偏弱。

The electron backscatter diffraction（EBSD） testing technique was used for the comparison analysis of two kinds（domestic and imported） of high-quality spring steels（55Si Cr）,including the dimension and distribution of pearlite colonies as well as the rolling texture. The results indicated that pearlite colony in two high-quality spring steels was very small with average size of 6-8 μm. The proportion of pearlite colony less than 10 μm was up to 84 % for the domestic steel sample. Both high-quality spring steels showed three types of grain orientation,i.e.,〈101〉,〈001〉 and 〈111〉.For the domestic steel,the grain orientation mainly concentrated on 〈001〉 and 〈111〉,while the imported spring steel exhibited relatively weak texture intensity in 〈101〉.