低合金白口铸铁热疲劳裂纹扩展动力学  

Kinetics of Thermal Fatigue Crack Propagation in Low Alloy White Cast Iron

作　　者：张雪芹[1] 王继东[2] 刘建华[3] 张瑞军[3] 

机构地区：[1]河北建材职业技术学院建筑工程系,河北秦皇岛066004 [2]燕山大学信息科学与工程学院,河北秦皇岛066004 [3]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《热加工工艺》2008年第13期15-16,共2页Hot Working Technology

摘　　要：研究了低合金白口铸铁在560～640℃范围内热疲劳裂纹扩展动力学。结果表明:低合金白口铸铁热疲劳裂纹的扩展长度L、裂纹扩展速度v与循环次数N之间分别符合L=bNa(a<1)和v=bNa-1,扩展激活能为24.50kJ/mol。The kinetics of thermal fatigue crack propagation in a low alloy white cast iron was studied under the temperature range of 560-640 ℃. The results show that the relatianship between crack propagation length L, crack propagation rate v and cycle times N can be expressed as L=bN^a （a〈1） and v =bN^0-1 respectively, and the activation energy of crack propagation is 24.50kJ/mol.

关 键 词：低合金白口铸铁 热疲劳 裂纹扩展 

分 类 号：TG143.1[一般工业技术—材料科学与工程]