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.
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