B微合金化9310钢的力学性能及回火组织研究  

Research on Mechanical Properties and Tempering Microstructure of B-Microalloyed 9310 Steel

作　　者：卢维[1,2] 黄顺喆[2] 王春旭[2] 厉勇[2] 王华昆[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《热加工工艺》2014年第24期182-185,共4页Hot Working Technology

摘　　要：采用金相、SEM、TEM等实验方法,研究了回火温度对B微合金化9310钢的微观组织和力学性能的影响规律。研究表明:B微合金化9310钢的力学性能随回火温度的变化规律与传统9310钢基本一致。添加微量B元素,一方面降低了9310钢的强度,特别是在低温回火阶段(<300℃),并使屈服强度峰值对应的回火温度向高温区移动100℃,另一方面显著提高9310钢的冲击韧度,使冲击功最低值对应的回火温度向低温区移动约50℃。微量B元素对9310钢的回火组织基本没有影响,但使原始奥氏体晶粒发生粗化,且奥氏体化温度越高,粗化效果越明显。和无B钢相比,B微合金化9310钢的冲击韧窝更深、更均匀,微量B元素促进回火过程中钢中碳化物的析出。The influences of tempering temperature on the microstructure and mechanical properties in B-microalloyed 9310 steel were researched by OM, SEM and TEM. The results show that the changing laws of mechanical properties with the tempering temperatures in B-microalloyed 9310 steel and traditional 9310 steel are basically identical. On the one hand, adding trace amounts of B reduces the strength of 9310 steel, especially at the low tempering temperatures （〈 300℃ ）, and makes the tempering temperature corresponding to the peak yield strength raising up to 100℃, on the other hand, the impact toughness of the steel increases significantly, and the tempering temperature corresponding to the minimum impact energy moves about 50 ~C toward the lower temperature zone. Trace amounts of B have no significant effect on tempering microstructure of 9310 steel, but make the original anstenite grain coarsening, and the higher the austenitizing temperature is, the more conspicuous the coarsening effect is. Moreover, compared with B-free steel, the impact toughness nest is deeper and more even in B-microalloyed 9310 steel, and trace amounts of B will promote the precipitation of carbides during the tempering process.

关 键 词：B微合金化 9310钢 回火组织 力学性能 

分 类 号：TG156.2[金属学及工艺—热处理]