18CrNiMo7-6齿轮钢的疲劳裂纹扩展行为  

Fatigue crack propagation behavior of 18CrNiMo7-6 gear steel

作　　者：段德盛 王文先[1] 闫志峰[1] 张军豪 张红霞[1] 张锦文[2] DUAN De-sheng;WANG Wen-xian;YAN Zhi-feng;ZHANG Jun-hao;ZHANG Hong-xia;ZHANG Jin-wen(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Technology Center,Shanxi Taigang Stainless Steel Co Ltd,Taiyuan 030003,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]山西太钢不锈钢股份有限公司技术中心,山西太原030003

出　　处：《材料热处理学报》2022年第7期101-107,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52075360);山西省重点研发计划(201903D111008)。

摘　　要：基于裂纹扩展与尖端温度演变规律,对18CrNiMo7-6齿轮钢疲劳裂纹扩展行为进行了研究。采用红外热像法建立了齿轮钢裂纹扩展过程中的温度变化与应力强度因子之间的对应关系,并与断裂力学分析结果进行对比,发现两者之间存在差异;通过对齿轮钢的疲劳断裂机理的分析,解释了产生这一现象的原因。结果表明:随着应力强度因子的增加,18CrNiMo7-6齿轮钢的裂纹扩展速率随之增加;红外热像法对裂纹扩展变化更为敏感,可用于实时监测材料中的疲劳损伤;由于齿轮钢的断裂机理从脆性解理断裂向韧性断裂的转变导致温升速率产生差异,使得红外热像法具有更高的敏感性。Based on the evolution law of crack propagation and tip temperature,the fatigue crack propagation behavior of 18 CrNiMo7-6 gear steel was studied.The corresponding relationship between temperature change and stress intensity factor during crack propagation of the gear steel was established by infrared thermography,and compared with the results of fracture mechanics analysis,it was found that there were differences between them.By analyzing the fatigue fracture mechanism of the gear steel,the reason for this phenomenon was explained.The results show that the crack growth rate of the 18 CrNiMo7-6 gear steel increases with the increase of stress intensity factor.Infrared thermography is more sensitive to the change of crack propagation and can be used to monitor the fatigue damage in materials in real time.The change of fracture mechanism of the gear steel from brittle cleavage fracture to ductile fracture leads to the difference of temperature rise rate,which makes the infrared thermography method more sensitive.

关 键 词：18CrNiMo7-6齿轮钢 红外热像 裂纹扩展速率 应力强度因子 断裂机理 

分 类 号：TG142.4[一般工业技术—材料科学与工程]