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采用金相显微镜、扫描电镜、透射电镜和疲劳试验机研究H13调质钢滚压形变强化疲劳前后的显微组织特征和应力,实验结果表明:H13钢疲劳抗力的提高主要是由于形变显微组织和应力的产生及表面粗糙度的降低导致的。滚压强化显微组织中产生高密度位错和单个、分散的变形孪晶,经过106以上的循环周次后,晶界一孪晶的交互作用是其主要特征,此时网状析出β′相已经完全转变为颗粒状β相。
The microstructure and stress of H13 quenched and tempered steel before and after rolling deformation strengthening fatigue test were studied by metallographic microscope, scanning electron microscope, transmission electron microscopy and fatigue testing machine. The experimental results show that the improvement of fatigue resistance of H13 steel is mainly due to deformation microstructure And stress generation and surface roughness caused by the reduction. High-density dislocations and single, dispersed deformable twins are produced in the rolling-enhanced microstructure. After more than 106 cycles, the interaction between grain boundaries and twins is the main feature. At this time, β ’ Phase has been completely transformed into granular β phase.