室温ECAP变形对T250马氏体时效钢组织和性能的影响  

Effect of ECAP at Room Temperature on Microstructure and Properties of T250 Maraging Steel

作　　者：谢东[1] 杨西荣[1] 赵西成[1] 席莎[1] 

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055

出　　处：《航空材料学报》2014年第6期28-32,共5页Journal of Aeronautical Materials

基　　金：陕西省教育厅专项科研计划项目(12JK0429)

摘　　要：研究等径弯曲通道变形（ECAP）过程中T250马氏体时效钢的组织变化规律,以及后续时效处理过程中,时效时间对硬度的影响.采用ECAP工艺对T250马氏体时效钢进行C方式2道次室温变形,并对原始试样和ECAP变形试样进行480℃/（15 ～ 480min）的时效处理.结果表明,随着ECAP道次的增加,材料x面的组织由较均匀整齐的板条状马氏体变成弯曲杂乱的马氏体,且在马氏体上出现位错胞和亚晶,y面则是马氏体板条的持续细化,而z面组织变化不明显;T250马氏体时效钢的硬度随道次增加而逐渐升高,而时效处理对T250钢的提升百分比下降,同时达到峰硬度所需的时间缩短.The microstructure changes of T250 maraging steel during equal channel angular precessing （ECAP） were studied,and the change of hardness with aging time was analyzed.T250 maraging steel was deformed by route C ECAP process 2 deformation at room temperature.And then,as-received samples and ECAP samples were aged at 480℃ for 15-480min.The results show that with the increase of ECAP pass,the microstructure of x plane changes from a more uniform neat lath into a more curved messy one.Then the subgrains and the dislocation cells appear in the lath.The change of y plane is refinement of martensite laths,and the microstructure of z plane is not changed.The hardness of T250 maraging steel is gradually increased with the increase of passes,and the increasing percentage of hardness by aging treatment is declined,meanwhile the time to maxmize hardness is shortened.

关 键 词：等径弯曲通道变形 马氏体时效钢 时效处理 

分 类 号：TG142.24[一般工业技术—材料科学与工程] V252.1[金属学及工艺—金属材料]