低温与真空条件下1Cr18Ni9Ti钢的疲劳行为  

Fatigue behavior of 1Cr18Ni9Ti steel at low temperatures and in vacuum

作　　者：王淑花[1] 杨德庄[1] 何世禹[1] 吕钢[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院

出　　处：《材料科学与工艺》2004年第6期625-629,共5页Materials Science and Technology

摘　　要：分别在室温大气、室温真空及低温真空几种环境条件下 ,对 1Cr18Ni9Ti钢进行对称载荷拉 -压疲劳试验 ,利用TEM观察疲劳断口附近的显微组织 ,研究了环境因素对疲劳性能的影响 ,并对影响的原因进行了分析和讨论 .研究表明 :1Cr18Ni9Ti钢在低温真空条件下疲劳性能显著提高 ;疲劳断口附近出现大量板条马氏体 ;真空与低温显著提高 1Cr18Ni9Ti钢疲劳性能的原因与真空对裂纹表面的净化效应 。Fatigue tests for the 1Cr18Ni9Ti steel were performed under the conditions of the room temperature atmosphere, the room temperature vacuum(300 K,10^(-4)Pa), and the low temperatures vacuum (150,100,(77 K;)10^(-4)Pa), respectively. Microstructures nearby the fatigue fractures of specimens were analyzed by TEM. The effect of environment on fatigue properties was studied. Results showed that the fatigue properties of 1Cr18Ni9Ti steel were remarkably improved under the conditions of vacuum and low temperatures, and there were many lath martensites nearby the fatigue fractures. The reasons for improving the fatigue properties of 1Cr18Ni9Ti steel caused by vacuum and low temperature were attributed to the cleaning-up effect of vacuum on crack surfaces and the formation of lath martensite induced by low temperature.

关 键 词：1CR18NI9TI 板条马氏体 疲劳断口 疲劳性能 显微组织 TEM 疲劳裂纹 低温 观察 原因 

分 类 号：TB33[一般工业技术—材料科学与工程] TG142.71[金属学及工艺—金属材料]