碳含量对低合金耐磨钢组织及耐磨性的影响

研究了碳含量分别为0.31%、0.38%和0.50%的低合金耐磨铸钢热处理后的组织、强韧性及不同磨损条件下的磨损性能。结果表明,试验钢经950℃淬火及250℃回火,显微组织均以板条马氏体为主,随含碳量的增加,组织有所粗化,并且有片状马氏体出现。试验钢的硬度随碳含量的增加而增加,但韧性下降。磨损试验结果表明,冲击磨料磨损条件下,主要表现为凿削磨损,碳含量为0.38%的试验钢具有较好的耐磨性;静磨料磨损条件下,主要表现为切削磨损,耐磨性主要受硬度的影响,碳含量为0.50%试验钢具有较好的耐磨性。

Influence of carbon content on microstructure and abrasive resistance of the low alloy wear resistant steels

Microstructure,strength-toughness and abrasive resistance of the low alloy wear resistant cast steels with 0.31%,0.38%,and 0.50% carbon content respectively after heat treatment were investigated under different wear conditions.The results show that the microstructure of the test steels with different carbon content quenched at 950 ℃ and tempered at 250 ℃ is mainly composed of tempered lath martensite.But with the increasing of the carbon content,the microstructure coarsens slightly and there is a little of plate martensite in the microstructure.The hardness of the test steels increase with the carbon content increasing,but the toughness decreases.The results of wear tests show that the mechanism of the impact abrasive wear is chiseling and cutting wear and the steel with 0.38% carbon content has a better abrasive resistance.The mechanism of the static abrasive wear is cutting wear and the steel with 0.50% carbon content has a better abrasive resistance.