形变热处理对T91钢组织和性能的影响  

Effects of thermomechanical treatment on microstructure and mechanical properties of T91 steel

作　　者：宁保群[1] 刘永长[1] 徐荣雷[1] 杨留栓[2] 

机构地区：[1]天津大学材料科学与工程学院 [2]平顶山工学院材料科学与工程系,平顶山467001

出　　处：《材料研究学报》2008年第2期191-196,共6页Chinese Journal of Materials Research

基　　金：国家自然科学基金50401003;全国优秀博士论文作者专项基金200335;天津市自然科学基金07JCZDJC01200;河南省国际合作项目0546620015~~

摘　　要：用热模拟机模拟T91铁素体耐热钢的形变热处理工艺,在T91钢的奥氏体未再结晶区(650-850℃)对其进行不同程度的变形,研究了直接淬火对T91钢的组织形成和力学性能的影响.结果表明:与传统热处理相比,形变热处理不仅使T91钢的组织明显细化,而且生成更多的MX型纳米级碳氮化物颗粒.通过拉伸实验表明:形变热处理工艺可以明显提高T91钢的强度,进而达到提高其使用温度的目的.The thermomechanical treatment processing was simulated by thermomechanical simulation instrument for the T91 ferritic heat-resistant steel. The effects of immediate quenching after different degrees of deformation in 650-850 ℃, locating in the austenite non-recrystallization region, on the microstructural formation and mechanical properties of T91 steel were studied. Optical microscopical and TEM observations showed that the adopted thermomechanical treatment could not only refine structure but also form more nano-sized MX carbonitride precipitates, as compared to the specimen after conventional normalizing and tempering treatment. Tensile tests showed that the thermomechanical treatment could effectively increase the strength of T91 steel which increases service temperature.

关 键 词：金属材料 形变热处理 铁素体耐热钢 纳米级碳氮化物 强度 

分 类 号：TG142[一般工业技术—材料科学与工程]