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通过改变退火时间改变了无间隙原子钢(IF钢)的晶界显微组织特征,借助电子背散射衍射仪(EBSD)和俄歇电子能谱仪(AES)分析了含磷无间隙原子钢的晶界特征与晶界处P的偏聚量,对比了冲击试验获得的韧脆转变温度(DBTT)。结果表明:IF钢DBTT的主要影响因素是P的晶界偏聚、晶界特征分布。增加IF钢中小角度晶界和重位点阵(CSL)晶界的比例,控制大角度晶界的比例能有效降低P在晶界的偏聚并改善钢的脆性。
By changing the annealing time, the grain boundary microstructure of the interstitial-free atomic steel (IF steel) was changed. The electron-backscatter diffraction (EBSD) and Auger electron spectroscopy (AES) The grain boundary characteristics and the segregation of P at the grain boundary, the ductile-brittle transition temperature (DBTT) obtained by the impact test is contrasted. The results show that the main influencing factors of IF steel DBTT are segregation of grain boundary and distribution of grain boundary. Increasing the proportion of small-angle and heavy-position lattice (CSL) grain boundaries in IF steels and controlling the ratio of large-angle grain boundaries can effectively reduce the segregation of P at grain boundaries and improve the brittleness of steel.