Abstract: The structure, impact toughness and abrasion resistance of steel HM (0.48C,5. 1Cr,2.0Mo,1.0V, 2.0W)and steel H13(0.38C,5. 1Cr,1.4Mo,1.0V) have been tested and researched. Results showed that as the con- tent of W and Mo in steel HM was higher than that in steel H13,more undissolved carbides existed in steel HM to hinder growth of austenite grain to get fine grain, the average impact value increased by 35.5% as compared with steel H13; with high temperature tempering, as more carbides dispersed precipitated from matrix of martensite in steel HM and secondary hardening was obvious, the abrasion resistance increased by 34.8% as compared with steel H13.

Key words: Shearing Blade, Steel HM, Alloy Carbides, Impact Toughness, Abrasion Resistance

摘要： 试验研究了HM钢(%:0.48C、5.1Cr、2.0Mo、1.0V、2.0W)和H13钢(%:0.38C、5.1Cr、1.4Mo、1.0V)的组织、冲击韧性和耐磨性。结果表明,HM钢中W、Mo元素含量较H13钢高,存在更多未溶碳化物阻碍奥氏体晶粒长大,细化晶粒,使平均冲击值比H13钢提高35.5%;HM钢高温回火时,马氏体基体弥散析出更多的碳化物,二次硬化效果显著,平均耐磨性比H13钢提高34.8%。

关键词: 剪切刃具, HM钢, 合金碳化物, 韧性, 耐磨性