700℃热循环冲击对Stellite12钴基合金组织以及折弯强度的影响Effects of thermal cycling shock at 700 ℃ on microstructure and flexural strength of Stellite12 cobalt-based alloy
张海燕,车洪艳,曹睿,刘国辉,陈剑虹
摘要(Abstract):
通过对Stellite12钴基合金在700℃下进行热循环冲击试验,结合扫描电镜组织观察、能谱分析、X射线衍射相分析、硬度分析以及弯曲试验,对Stellite12热循环冲击前后的组织、硬度、裂纹出现情况及折弯强度进行研究。研究发现:冲击前后Stellite12钴基合金的组织和硬度并未发生较大变化,WC相的边缘出现同成分的絮状扩散物。随着热冲击次数的增多,材料出现微裂纹且微裂纹起源于边缘,并不断扩展,最终形成裂缝。而材料的折弯强度却在75次热循环冲击后大幅降低,同时统计折弯断面上热冲击过程中出现裂纹的区域所占面积比率发现:随着面积比率的增大折弯强度降低,强度大幅降低的临界面积比率为23%。
关键词(KeyWords): Stellite12;热循环冲击;裂纹;折弯强度
基金项目(Foundation): 国家自然科学基金项目(51675255)
作者(Author): 张海燕,车洪艳,曹睿,刘国辉,陈剑虹
DOI: 10.13289/j.issn.1009-6264.2017.02.010
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