Liu Pengtao, Lin Zilong, Liu Chunpeng, Zhao Xiujuan, Ren Ruiming
School of Material Science and Engineering, Dalian JiaoTong University, Dalian 116028, China.
Key Laboratory of Key Material of Rail Transit in Liaoning Province, Dalian JiaoTong University, Dalian 116028, China.
Materials (Basel). 2020 Nov 29;13(23):5438. doi: 10.3390/ma13235438.
A GPM-30 fatigue machine was used to investigate the influence of surface ultrasonic rolling (SURT) on the rolling contact fatigue (RCF) life of D2 wheel steel. The experimental results present that the RCF life of the grinding processing sample is 4.1 × 10 cycles. During the RCF process, the flaking of the fine grain layer and high surface roughness of the grinding processing sample cause the production of RCF cracks. When the samples are treated by SURT with 0.2 MPa and 0.4 MPa, the RCF life is 9.2 × 10 cycles and 9.6 × 10 cycles, respectively. After SURT, the surface roughness of the samples is reduced, and a certain thickness of gradient-plastic-deformation layer and a residual-compressive-stress layer are produced. These factors lead to the improvement of the RCF property. However, when the static pressure increases to 0.6 MPa during SURT, the RCF life of the sample is reduced during RCF testing. The micro-cracks, which are formed during SURT, become the crack source and cause the formation of RCF cracks, decreasing of the RCF life.
采用GPM - 30疲劳试验机研究了表面超声滚压（SURT）对D2车轮钢滚动接触疲劳（RCF）寿命的影响。实验结果表明，磨削加工试样的RCF寿命为4.1×10⁵次循环。在RCF过程中，磨削加工试样的细晶粒层剥落和高表面粗糙度导致了RCF裂纹的产生。当试样分别采用0.2 MPa和0.4 MPa的SURT处理时，RCF寿命分别为9.2×10⁵次循环和9.6×10⁵次循环。SURT处理后，试样的表面粗糙度降低，并产生了一定厚度的梯度塑性变形层和残余压应力层。这些因素导致了RCF性能的提高。然而，当SURT过程中的静压增加到0.6 MPa时，试样在RCF试验中的RCF寿命降低。SURT过程中形成的微裂纹成为裂纹源，导致RCF裂纹的形成，降低了RCF寿命。
