冷拔珠光体钢丝渗碳体微观结构
Transactions of Materials and Heat Treatment(2010)
Abstract
采用扫描电镜(SEM)、透射电镜(TEM)和高分辨透射电镜(HREM)观察了拉拔前后SWRH82B钢丝的显微组织,并采用振动样品磁强计(VSM)研究了渗碳体含量随应变量的变化规律。结果表明,钢丝经拉拔变形后,铁素体中形成竹节状位错亚结构;渗碳体片层内部碎化,并出现非晶。VSM测量显示,随着应变量的增加,钢丝比饱和磁化强度不断升高,渗碳体含量逐渐减少。变形前,钢丝的比饱和磁化强度为198.84 emu/g。经过应变量为1.90拉拔变形后,钢丝的比饱和磁化强度升高到210.9emu/g。相应的渗碳体含量则由变形前的14.1%降至变形后的8.9%。这表明SWRH82B钢丝经过应变量为1.90的拉拔后,渗碳体发生了部分溶解。
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Key words
Amorphous,Cementite,Cold drawn steel wires,Saturation magnetization
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