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对不同合金元素含量的低合金耐磨钢进行淬火加回火热处理后,测试力学性能及-40℃冲击吸收能量,借助SEM、TEM等分析组织及析出相,研究合金元素对低合金耐磨钢的组织和性能的影响。结果表明:含有Ni、Cu、Cr、Mo等合金元素的试验钢淬火及190℃低温回火后均得到板条状马氏体组织,马氏体板条间有细小碳化物析出相。而没有添加Ni、Cu及少量添加Cr、Mo元素的试验钢淬透性降低,淬火及低温回火组织为马氏体及少量铁素体。添加Ni、Cu、Cr、Mo等合金元素的试验钢淬火及低温回火后得到较好的综合力学性能,最佳性能为屈服强度1218 MPa,抗拉强度1507 MPa,硬度429.5 HV,-40℃冲击吸收能量27.7 J。
The low alloyed wear resistant steels with different alloying elements were quenched and tempered, the mechanical properties were tested and the impact energy absorbed at -40 ℃. The microstructure and precipitated phases were analyzed by SEM, TEM and so on. The impact of organization and performance. The results show that all the test steels containing Ni, Cu, Cr, Mo and other alloying elements have martensite structure after quenching and tempering at 190 ℃. There are fine carbide precipitates between martensite laths. But without adding Ni, Cu and a small amount of added Cr, Mo element of the test steel to reduce hardenability, quenching and low temperature tempering martensite and a small amount of ferrite. The addition of Ni, Cu, Cr, Mo and other alloying elements of the test steel after quenching and low temperature tempering get better mechanical properties, the best performance yield strength 1218 MPa, tensile strength 1507 MPa, hardness 429.5 HV, -40 ℃ Shock absorption energy 27.7 J.