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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 influence of tempering temperature on microstructure and mechanical properties of B microalloyed 9310 steel was studied by means of metallographic, SEM and TEM experiments. The results show that: the mechanical properties of B microalloyed 9310 steel with the tempering temperature changes basically the same with the traditional 9310 steel. The addition of trace elements B, on the one hand, reduced the strength of 9310 steel, especially during the low temperature tempering (<300 ° C) and shifted the tempering temperature corresponding to the peak of yield strength by 100 ° C to the high temperature and significantly increased 9310 The impact toughness of steel, the impact energy corresponding to the lowest tempering temperature to the low temperature zone about 50 ℃. Trace B element has no effect on the tempering microstructure of 9310 steel, but the original austenite grain coarsening, and the higher the austenitizing temperature, the more obvious the coarsening effect. Compared with non-B steel, B micro-alloyed 9310 steel impact dimple deeper and more uniform, trace B elements promote the precipitation of carbides in steel during tempering.