石墨对超高碳钢组织和性能的影响
Effect of Graphite on Microstructure and Mechanical Properties of Ultra-high Carbon Steels
李炜新
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作者单位：(廊坊职业技术学院 机械工程系, 河北 廊坊 065000)
中文关键字：超高碳钢； 石墨； 力学性能
英文关键字：ultrahigh carbon steel; graphite; mechanical properties
中文摘要：通过细化碳化物获得优良性能的超高碳钢。结果表明，显微组织中除了珠光体和晶界上的网状碳化物外，还有约6.5%的球状石墨。由于少量球状石墨的存在，经850 ℃× 3 h球化退火处理后的钢表现出良好的塑性，伸长率达12.5%，且抗拉强度达967 MPa、屈服强度达715 MPa。
英文摘要：Ultrahigh carbon steel was obtained by fining carbides. However, in the process of preparing ultrahigh carbon steel with high aluminum and carbon content, it is found that there is 6.5% graphite in the form of spheroidal precipitates in addition to intragranular pearlite and network carbides in grain boundaries. Because there is a little graphite in the form of spheroidal morphology, the steel annealing at 850 ℃for 3 h has a good plasticity, the plasticity is 12.5%, the tensile strength is 967 MPa, the yield strength is 715 MPa.