Cu-Mo蠕铁热疲劳性能研究  

Study on Thermal Fatigue Property of Cu-Mo Vermicular Graphite Cast Iron

作　　者：杨忠[1] 王金炜[1] 冯云鹏[2] 杨雨[2] 王建东 YANG Zhong;WANG Jinwei;FENG Yunpeng;YANG Yu;WANG Jiandong(School of Materials and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China;Beijing Special Vehicle Research Institude,Beijing 100071,China;Xi'an Military Representative Office of Armored Military of PLA,Xi'an 710032,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021 [2]北京特种车辆研究所,北京100071 [3]中国人民解放军陆军装甲兵军事代表局驻西安地区军事代表室,陕西西安710032

出　　处：《热加工工艺》2018年第24期79-81,85,共4页Hot Working Technology

摘　　要：采用升降法计算350℃和500℃时Cu-Mo蠕铁的疲劳极限,绘制S-N曲线,分析350℃和500℃时Cu-Mo蠕铁疲劳性能的差异。使用扫描电镜分析热疲劳断口形貌,探讨Cu-Mo蠕铁的热疲劳失效机理。结果表明:当温度从350℃升至500℃时,Cu-Mo蠕铁的疲劳极限从143.5 MPa降至127.5 MPa;当Cu-Mo蠕铁热疲劳失效出现时,疲劳裂纹主要从夹杂物与基体的界面萌生,疲劳裂纹主要沿石墨扩展,主要疲劳断裂方式是解理断裂。The fatigue limit of Cu-Mo vermicular graphite cast iron at 350 ℃ and 500 ℃ was measured by staircase method, and S-N curve was drawn. The fatigue performance difference of Cu-Mo vermicular graphite cast iron at 350 ℃ and500 ℃ was analyzed. The thermal fatigue fracture morphology was analyzed by SEM,and then the thermal fatigue failure mechanism of Cu-Mo vermicular graphite cast iron was discussed. The results show that the fatigue limit of Cu-Mo vermicular graphite cast iron decreases from 143.5 MPa to 127.5 MPa,when the temperature increases from 350 ℃ to 500 ℃. When the thermal fatigue failure of Cu-Mo vermicular graphite cast iron appears, the fatigue crack initiates mainly at the interface between the inclusions and the matrix, and then, the fatigue crack extends mainly along the graphite, and the main fatigue fracture way is cleavage fracture.

关 键 词：Cu-Mo蠕铁 热疲劳性能 疲劳失效机理 

分 类 号：TG143.49[一般工业技术—材料科学与工程]