【摘要】 对1.6%C超高碳钢进行离异共析和淬火+高温回火两种工艺球化预处理,获得了铁素体基体上分布超细碳化物组织,在此基础上进行了两类淬火处理。显微组织观察分析表明:淬火组织亚结构为位错与孪晶并存;采用感应加热淬火时随感应加热淬火次数增加,板条马氏体增加,孪晶马氏体减少。力学性能测试显示:本试验用超高碳钢强度与中碳结构钢相当;塑性很好,伸长率达17%。更多还原

【Abstract】 Heat treatments of DET(Divorced Eutectoid Transformation) and quenching+tempering were carried out to obtain the microstructure of ferrite with ultra-fine carbides for a 1.6%C ultra-high carbon steel.Simultaneously microstructure of quenched steel was observed by transmission election microscope.It is shown that the sub-structure is composed of dislocations and twins.When increasing the time of inducing-heat quenching,the steel shows that the quantity of lath martensite increases but decreases with twin martensite.The mechanical properties are measured to indicate that the ultra-high carbon steel has almost the same intensity as structure steels with moderate carbon and good plasticity,with extension rate 17%.更多还原