钨对热锻模具钢一次碳化物形貌及冲击性能的影响

Effect of tungsten content on eutectic carbides morphology and impact property of hot-working die steels

在传统Cr-Mo-V系马氏体型热作模具钢基础上,研究了不同W含量对热锻模具钢的一次碳化物形貌以及冲击性能的影响。结果表明,随着W含量的上升,钢中一次碳化物数量增多,一次碳化物类型逐渐由M_2C型转变为M_6C型,形貌由圆度较大、带有尖角的不规则形状逐渐转变为球状;不同W含量的试验钢回火二次硬化峰温度都为510℃,峰值硬度相差不大,均在58 HRC左右,比通用型H13高5 HRC;随着W含量的升高,试验钢冲击吸收能量先上升后下降,W含量在2%附近时,冲击吸收能量最大。

Based on the traditional Cr-Mo-V martensitic hot-work die steels,the effect of W content on eutectic carbides morphology and impact property of hot-work die steels were studied. The results show that with the W content increasing,the eutectic carbides number increases and changes from M_2C to M_6C type. Meanwhile,the morphology of eutectic carbides changes from irregular shape with larger roundness and having sharp corner into spherical. The tempering secondary hardening peak of tested steels with different W content are all about 58 HRC at the temperature of 510 ℃,which 5 HRC higher than H13 steel. Besides,with the W content increases,the impact absorbed energy of the tested steels first increases,reach the maximum when the content is 2% and then decrease.