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以M54合金成分为基础,利用JMatPro软件计算了碳、钴、镍元素含量对钴镍系超高强度钢强度性能的影响,以及M2C析出相体积分数随钼、铬、钨元素含量的变化规律,根据计算结果设计了一种新的超高强度钢。结果表明:合金中碳含量在0.25%~0.45%范围,钴含量在5%~15%范围,镍含量在5%~10%范围时,随碳、钴、镍元素含量增加,合金强度提高。钼元素含量为2%~3%,铬元素含量为1.5%~2.5%时,析出相体积分数为4%,具有较好的沉淀强化效果。设计合金成分为0.35C-10Co-10Ni-2.5Mo-2Cr-1.3W-0.5V。热处理后组织为回火马氏体组织以及弥散分布的纳米级棒状M2C析出相,抗拉强度最高可达2380MPa,与M54钢相比提高了360MPa。
Based on the M54 alloy composition, the effect of carbon, cobalt and nickel contents on the strength properties of the cobalt-nickel ultra-high strength steel was calculated by JMatPro software and the variation of the volume fraction of M2C precipitates with molybdenum, chromium and tungsten contents was calculated. According to the result of calculation, a new ultra-high strength steel was designed. The results show that with the content of carbon in the range of 0.25% ~ 0.45%, the content of cobalt in the range of 5% ~ 15% and the content of nickel in the range of 5% ~ 10%, the strength of the alloy increases with the increase of carbon, cobalt and nickel contents. When the content of molybdenum is 2% -3% and the content of chromium is 1.5% ~ 2.5%, the volume fraction of precipitated phase is 4%, which has good precipitation strengthening effect. Design alloy composition 0.35C-10Co-10Ni-2.5Mo-2Cr-1.3W-0.5V. After heat treatment, the microstructure of tempered martensite and dispersed nano-scale bar M2C precipitated phase, the tensile strength of up to 2380MPa, compared with M54 steel increased by 360MPa.