用系列冲击试验法研究了30CrMnsiA钢在常规热处理工艺条件下,不同磷含量与冲击韧性的关系.试验结果表明,当磷含量≥0.012wt-%时,随磷含量的增加,冲击韧性明显下降.扫描电镜和Auger能谱分析发现,随磷含量增加,沿晶断裂面积及晶界上磷偏析增加.回火后缓慢冷却促进磷向晶界偏析,并使低温冲击韧性显著下降.550℃为本实验钢的高温回火脆性温度.
The effect of P contents on the impact toughness of conventionally heat-treated 30CrMnSiA steel has been investigated by means of a series of impact tests.It was resulted that the impact toughness decreases remarkably with the increas-ing of P contents no less than 0.012wt-%.The observation under SEM and byAuger spectroscopy showed that the grain boundary cracking area and the P seg-regation on grain boundaries increase with the increase of P contents.The P seg-regation toward the grain boundary and the noticeable lowering of low tempera-ture impact toughness may be promoted by slow cooling after tempering.The crit-ical temperature of high temperature temper brittleness of the steel tested seemsto be 550℃.
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