Abstract: The effects of boron contents on the solution time and temperature of precipitated phase in steel S31254 are studied by solution treatment. The time and temperature required for the complete solution of steel S31254 second phase under different boron contents are obtained. The results show that as the boron content increases, the required solid solution temperature and time decrease. When the boron content in the steel is 0.002% ,a relatively pure austenite structure can be obtained by solid solution treatment at 1200℃ for 4 hours, that is to say, the second phases precipitated in the grains and grain boundary have been re-dissolved into the matrix during the hot working process. In addition, during the solid solution treatment, the second phases in the grains preferentially dissolve, and as passage of time, the second phases at the grain boundary gradually dissolve.

摘要： 采用固溶处理研究了不同硼含量对S31254钢中析出相固溶时间、固溶温度的影响。得到了不同硼含量条件下的S31254钢第二相完全固溶所需的时间和温度。结果表明,随着硼含量的增加,所需固溶温度下降,所需固溶时间减少。当钢中硼含量为0.002%时,析出相的固溶温度为1200℃,固溶处理4h可得到相对纯净的奥氏体组织,热加工过程在晶内和晶界析出的第二相均已重新固溶到基体中。固溶处理时,晶内第二相优先溶解,随着时间的增加,晶界处的第二相逐步溶解。