From the micro-region view-point, the five stages of fatigue take place successively, and some new explanations for the fatiguehardening, softening and fracture are given.
从微区观点，提出了疲劳过程包含五个阶段，并对其中疲劳强化、硬化和断裂问题作些新的解释。
2
It is found that the steel resistances to fatigue crack growth increase with the rising of the tempering temperature when it is higher than the second hardening peak temperature.
发现高于二次硬比峰温度回火时，此钢的疲劳裂纹扩展阻力随回火温度升高而增加。
3
For the first time, the paper adds residual stress produced by hardening to the model. Then prequench crankshaft and postquench crankshaft are fatigue analyzed.