振动时效机理研究

通过分析、对比热时效和振动时效两种时效机理 ,揭示两者在调整宏观残余应力上的本质是类同的 ,都是通过塑性变形减少金属残余弹性应变从而达到宏观残余应力的释放 ,只是产生塑性变形所用手段不同。同时从两种时效时金属内部组织的不同变化 :热时效减少晶格畸变、振动时效使金属组织进一步细化 ,位错密度增加 ,揭示振动时效与热时效在工件尺寸稳定性方面的差异。最后得出结论 :在许多场合振动时效和热时效同样可行且振动时效的尺寸稳定性、抗疲劳强度极限更优于热时效

Research on Vibratory Stress Relief Mechanism

Through making an analysis and comparison between the mechanism of the heat treatment and vibratory stress relief (VSR), we deem that VSR and heat treatment are similar in nature on reducing the macroscopic residual stress. They all release the macroscopic residual stress through plasticity deformation to reduce metal residual elasticity strain, but the process of making plasticity deformation is not alike. The paper also reveal the difference in working dimension stability based on the different variation in metal internal arrangement caused by the different time effect. Finally, we conclude that VSR is as practicable as heat treatment in many occasions and VSR is better than heat treatment in dimension stability and fatigue strength.