摘要
通过在临界区退火后水淬及在 4 50℃等温不同时间后水淬 ,以获得不同低温转变产物及体积分数的 F+M、F+B+M和 F+B组织 ,探讨了热处理工艺对显微组织的影响 ,并研究了低温转变产物的性质及体积分数对拉伸、延伸凸缘性的影响。结果表明 ,低温转变产物贝氏体代替马氏体 ,大大改善了延伸凸缘性。F+1 0 % B1 +1 %～ 2 % M的复相组织具有最好的综合性能 ,适当的低温转变产物及粒度、降低低温转变产物与铁素体的硬度比和良好的总伸长率是改善低碳含铌车轮用钢冲压成型性的主要因素。
Through water hardening at critical zone after being annealed, and water hardening at different time points at 450℃, different low temperature transformation products are obtained at differnt volume percent, including F and M, P,B and M, and F and B. The paper presents heat treatment influence on transformation products, and its impact on tension and elongation convexity. The results show that after Binite replaces Martensite, elongation convexity enhances greatly.The multiphase microstructure with F, 10% B and 1%～2% M has the best balanced performance. Such main factors as suitable low temperature transformation products and particle size, lower hardness of transformation product and Ferrite and good total elongation rate can improve the drawing formability of low carbon wheel steel with Ni.
出处
《鞍钢技术》
CAS
2001年第3期30-33,共4页
Angang Technology
关键词
车轮
复相钢
显微组织
延伸凸缘性
汽车
wheel steel multiphase steel microstructure elongation convexity
