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在热处理工艺和合金元素基本确定的条件下,研究了含碳量对低合金耐磨铸钢强韧性的影响。结果表明:随着碳含量的增加,显微组织由粒状贝氏体+M-A岛+铁素体,逐渐向上贝氏体、马氏体、下贝氏体转变,同时出现少量残余奥氏体。当碳含量质量分数为0.40%时,钢的硬度≥44 HRC,冲击韧度≤120 J/cm2,钢的强韧匹配效果较佳。
The influence of carbon content on the toughness of low alloy wear-resistant cast steel was studied under the conditions of heat treatment and the basic alloying elements. The results show that with the increase of carbon content, the microstructure changes from granular bainite + M-A island + ferrite to gradually up-bainite, martensite and lower bainite with a small amount of retained austenite. When the mass fraction of carbon content is 0.40%, the hardness of the steel is ≥44 HRC and the impact toughness is ≤120 J / cm2, the tough matching effect of the steel is better.