循环相变对T250马氏体时效钢组织和性能的影响  

Influence of Cyclic Phase Transformation on Microstructure and Properties of T250 Maraging Steel

作　　者：谢东[1] 杨西荣[1] 赵西成[1] 马伟洲 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《热加工工艺》2015年第12期190-194,197,共6页Hot Working Technology

基　　金：陕西省教育厅专项科研计划项目(12JK0429)

摘　　要：通过DSC法测量T250马氏体时效钢的再结晶温度,随后采用多种α＇→γ循环相变细化工艺进行试验,其加热温度高于再结晶温度50~150℃。结果表明,T250马氏体时效钢的再结晶温度为773℃;通过对比,确定先经过低温固溶的变温循环相变细化工艺为最佳细化工艺,其晶粒尺寸最终达到9.1μm;但循环相变对T250马氏体时效钢的硬度影响不大。利用T250马氏体时效钢进行循环热处理,成功地获得超细化晶粒,并且确定最佳细化工艺。经过循环热处理,晶粒得到明显细化,较好地达到晶粒超细化的目的。The recrystallization temperature of T250 maraging steel was determined using DSC （differential scanning calorimetry）. Then, some α＇→γcyclic phase transformation refining precesses were used to complete the experiment and the heating temperature was 50-150 ℃ higher than the recrystallization temperature. The results show that the recrystallization temperature is 773 ℃. The best process which is non-isothermal cyclic phase transformation after the low temperature solution treatment is determined by comparing of experimental results, and grain size reaches 9.1 μm eventually. But the cyclic phase transformation has little effect on hardness of T250 maraging steel. The ultrafine grain is obtained successfully by using the cyclic heat treatment of T250 maraging steel, and the best refinement precess is determined. After cycle heat treatment, the grain has been refined, achieving the purpose of obtaining ultrafine grain.

关 键 词：马氏体时效钢 循环相变 差示扫描量热法 再结晶 

分 类 号：TG142.24[一般工业技术—材料科学与工程]