T10A钢组织超细化预处理后的超塑性压缩试验  

Superplastic Compression Test of T10A Steel after Pretreatment for Ultra-Fine Microstructure

作　　者：杨蕴林[1] 张柯柯[1] 王长生[1] 赵宁[1] 徐翔民[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003

出　　处：《钢铁研究学报》2004年第6期65-68,共4页Journal of Iron and Steel Research

基　　金：河南省自然科学基金资助项目(984040900)

摘　　要：采用盐浴加热循环淬火和高频感应加热淬火对T10A钢进行组织超细化预处理 ,然后在恒温压缩变形条件下进行超塑性研究。试验表明 ,在 710～ 770℃、初始应变速率 10 -4～ 10 -3 s-1的变形条件下 ,该钢的σ ε曲线具有明显的超塑流变特征 ,稳态流变应力仅 4 0MPa左右 ,应变速率敏感性指数可达 0 5 ,变形激活能为 183～ 194kJ/mol,与α Fe晶界自扩散激活能接近。高频淬火较循环淬火有更好的组织细化效果 ,因而高频淬火预处理后的超塑性流变特征更明显。The superplasticity research was carried out under constant temperature compression deformation for salt-bath cyclic quenched and high frequency hardened T10A steel. The results show that, the σ-ε curve of such steel has obvious superplastic deformation characteristics at the welding temperature of 710-770 ℃ with an initial strain rate of (10^(-4)-10^(-5) s^(-1)). The steady deformation stress is only about 40 MPa. The sentisive index of strain rate m is up to 0.5. Activation energy of deformation is close to self-diffusion activation energy of α -Fe grain boundary. The high frequency hardening gives more fine microstructure than cyclic quenching, so the superplastic deformation characteristics of steel are more obvious after pretreatment for high frequency hardening.

关 键 词：超塑性 T10A钢 压缩试验 循环淬火 高频淬火 

分 类 号：TG115[金属学及工艺—物理冶金]