摘要
本文用恒应变低周疲劳试验和TEM观察,研究了钒钛微合金钢的高应变疲劳硬化、软化行为及循环应变过程中的微观结构,分析了影响硬化、软化的因素,探讨了提高疲劳抗力的相应措施。结果表明:钒钛微合金钢的高应变循环硬化、软化受微合金化及应变量等因素影响。微观上,循环硬化与位错增殖及位错缠结有关,循环软化主要由于位错密度降低,位错胞结构形成。
The high strain fatigue hardening and softening actions of V, Ti microalloyed steels and their micro-structures in the process of cyclic strain are studied by means of constant strain low cycle fatigue experiments and TEM observations. The factors influencing on hardening and softening are analy sed and the way to improve fatigue resistence is discussed. The results show that high train Low cycle hardening and softening of V, Ti micrealloyed steels are influenced by microalloying and the value of strain. In microstructure, cycle hardening is related to dislocation multiplication and dislocation tangle, on the other hand, cycle softening is mainly due to decreasing of dislocation density and forming of dislocation cell structure.
出处
《钢铁》
CAS
CSCD
北大核心
1992年第5期46-49,共4页
Iron and Steel
