Journal
TRIBOLOGY INTERNATIONAL
Volume 143, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2019.106091
Keywords
Wear rate; Damage mechanism; Synergistic result; Fatigue crack
Categories
Funding
- National Natural Science Foundation of China [51775455, 51975489, 51805446]
- Program of China Railways Corporation [2017G011-A]
- Doctoral Innovation Fund Program of Southwest Jiaotong University [D-CX201810]
- Cultivation Program for the Excellent Doctoral Dissertation of Southwest Jiaotong University
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The wear and rolling contact fatigue of wheel-rail materials were investigated through varying wheel/rail hardness ratios (H-w/H-r) and creepages. The results indicated that with the H-w/H-r increasing from 0.927 to 1.218, the wheel wear rate reduced significantly in the case of H-w/H-r = 1.218, the rail wear rate showed an increasing trend. Both the wheel and rail wear rates increased as the creepage enlarged. The synergistic results of Hw/Hr and creepage caused a transition of the wear and damage mechanisms on the wheel-rail steels. Besides, the fatigue damage of ER7 and CL60 wheel materials was dominated by slender multi-layer cracks, while the fatigue cracks were short and contained lots of interlayer broken materials on C-class wheel steel.
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