摘要
紧固件工作失效多起源于疲劳,利用光学显微镜、透射电子显微镜、洛氏硬度仪和耐疲劳性能试验机等分析测试方法研究时效处理对减面率22.5%的非调质钢MFT8紧固件的组织、硬度和耐疲劳性能的影响。研究结果表明:与未时效处理试样相比,时效工艺为300℃×2h时,其硬度和耐疲劳极限达到最大值。时效强化和耐疲劳性能提高的主要原因是,在时效回复处理过程中,位错之间相互反应而湮灭或逐渐迁移而重排,引起位错墙或位错胞内部位错密度减少,形成具有稳定状态或亚稳定状态的组织结构或亚结构。
Effect of aging treatment on microstructure,hardness and fatigue properties of microalloyed steel MFT8 for fastener with 22.5% in draft was investigated by employing optical microscope,transmission electron microscope,Rockwell hardness and fatigue testing method.The results show that comparison with the original sample,the sample aged at 300 ℃ for 2 h have highest values of hardness and fatigue limit,which is increased by 21.5% and 5% respectively.It is attributed to the formation of stable microstructure resulted from decrease and rearrangement of dislocation during aging recovery.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2013年第2期54-57,共4页
Journal of Iron and Steel Research
基金
江苏省高等学校大学生实践创新训练计划资助项目(2012JSSPITP1950)
江苏省高校科研成果产业化推进项目(JHB2011-25)
关键词
低温时效
显微组织
耐疲劳性能
非调质钢
紧固件
low-temperature aging
microstructure
fatigue property
microalloyed steel
fastener
