摘要
采用光学显微镜、扫描电镜、全自动维氏硬度计、直读光谱仪、电感耦合等离子发射光谱仪等分析手段对某断裂失效的S钩进行断裂机理研究。结果表明:S钩断裂为疲劳断裂,主要原因是S钩表面脱碳层所导致的S钩表面弱化,脱碳层表面硬度远远低于芯部基体硬度,加速了疲劳裂纹源的形成,从而加速了疲劳断裂过程;并提出了相应的改进措施。
Fracture mechanism of S hook was studied by means of optical microscope,scanning electron microscope( SEM),automatic Vivtorinox hardness tester,direct reading spectrum and inductively coupled plasma emission spectrometer. Results showed that S hook fracture was fatigue fracture. The main reason was the surface weakening of the S hook caused by the decarburization layer on the S hook surface,and the surface hardness of the decarburization layer was much lower than that of the core substrate,which promoted the formation of the fatigue crack and accelerated the fatigue fracture process. The corresponding countermeasures were also proposed.
引文
[1]姜爱华,陈亮,师红旗,等.螺栓疲劳断裂失效分析[J].热加工工艺,2013,42(2):222-223.
[2]叶健熠,高元安,谢倩.GCr4与GCr15钢冲击韧性和接触疲劳寿命对比分析[J].轴承,2003,15(2):30-32.
[3]陈亮,徐钢新.多次调质对980钢组织和力学性能的影响[J].金属热处理,2015,40(5):121-123.
[4]张继玲,李福永.淬火保温时间和回火温度对27SiMn油缸组织与性能的影响[J].热加工工艺,2012,41(22):229-231.
[5]安丽乔. 60Si2CrVAT弹簧钢疲劳性能研究[D].大连:大连交通大学,2008:32-33.
