形变温度对Q235碳素钢应变诱导相变的影响  

INFLUENCE OF DEFORMING TEMPERATURES ON THE STRAIN INDUCED TRANSFORMATION IN Q235 PLAIN CARBON STEEL

作　　者：杨平[1] 傅云义[1] 崔凤娥[1] 孙祖庆[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《金属学报》2001年第6期601-608,共8页Acta Metallurgica Sinica

基　　金：国家科技部973资助项目G1998061506

摘　　要：　研究了热模拟单向压缩条件下形变温度对Ｑ２３５碳素钢应变诱导相变过程组织变化的影响．结果表明，铁素体可在Ａ３以上较高的温度下因形变而存在．大应变了该钢不存在单纯的形变奥氏体状态随形变温度的降低；组织变化的规律为由奥氏体的动态再结晶为主，过渡到奥氏体动态再结晶与铁素体的诱导析出同时进行，再过渡为铁素体的析出与铁素体的动态而结晶相继进行的过程．碳素钢热加工过程在微观上实质是动态复合转变过程．奥氏体的动态再结晶影响了铁素体的形态、分布与细化效果高温形变后的保温导致铁素体向奥氏体的逆转变．The influence of deforming temperature on ferrite transformation with the emphasis on the temperature range of above A3 was followed in thermal simulating tests of Q235 plain carbon steel. Results reveal that ferrite could be induced by strain at higher temperature above A3. At heavy strain no single state of deformed austenite was observed in this steel. As deforming temperature decreased, a transition of austenite dynamic recrystallization as dominant process to the concurrent process of austenite dynamic recrystallization and ferrite formation was detected and then strain induced ferrite transformation followed by ferrite dynamic recrystallization was observed. In plain carbon steel thermal mechanical processing should be characterized basically in microscale as dynamic combined transformation. Austenite dynamic recrystallization affected ferrite morphology, distribution and its refinement. Holding after deformation at above A3 led to an inverse transformation of ferrite to austenite.

关 键 词：碳素钢 应变诱导相变 动态再结晶 形变温度 

分 类 号：TG142.31[一般工业技术—材料科学与工程] TG111.7[金属学及工艺—金属材料]