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以超高强铸钢为研究对象,通过改变碳元素的含量及添加微量RE,经过金相组织观察,拉伸和冲击试验研究碳含量变化对超高强铸钢组织和性能的影响。结果表明,对不同C含量铸钢试样进行热处理后,可获得回火索氏体。在本试验条件及成分范围内,随着C含量增加,强度和硬度增加,伸长率、断面收缩率和低温(-40℃)冲击功逐渐下降。试样的最高抗拉强度可达1 185.6 MPa,同时伸长率可达11.4%,低温(-40℃)冲击功可达21.4 J。
Taking ultra-high strength cast steel as the research object, the effects of carbon content on the microstructure and properties of ultra-high strength cast steel were investigated by microstructure observation, tensile test and impact test by changing the carbon content and adding trace RE. The results show that the tempered sorbite can be obtained after the heat treatment of cast steel samples with different C content. Within the test conditions and composition, with the increase of C content, the strength and hardness increase, the elongation, reduction of area and the impact energy at low temperature (-40 ℃) decrease gradually. The maximum tensile strength of the sample can reach 1 185.6 MPa, while the elongation can reach 11.4%. The impact energy at low temperature (-40 ℃) can reach 21.4J.