Abstract
The present work aimed to improve fatigue performance of LZ50 axle steels by using LSP methods. LSP was applied to the surface of LZ50 axle steel specimens, the JD-1 wheel/rail simulation machine was used to explore the fatigue performance of LZ50 axle steels under LSP with different parameters. The surface hardness of two axle specimens with different parameters of LSP significantly increases at the rate about 18% and 27%, respectively. After LSP at the interference fitted surface of the LZ50 axle steel specimens, a plastic deformation layer was generated, resulting in a high residual compressive stress. After test, both sides of the interference fitted surfaces emerged annular band damages which presented plough and spalling, and the damage mechanism was abrasive wear, oxidation wear and delamination. The morphology feature of fracture surface before and after LSP is similar and fatigue crack initiation is multisource. Many of quasi-cleavage fracture in the propagation area are trans-granular fracture mode. A large number of dimples and second cracks appeares in the final fracture area. The fatigue life of the axle materials is obviously improved by LSP, and the fatigue life rate of the two treated axle specimens with different parameters increases by 31% and 21%, respectively.
| Translated title of the contribution | Experimental Study on Influences of Laser Shock Processing on Fatigue Performance of LZ50 Axle Steels |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 267-273 |
| Number of pages | 7 |
| Journal | Zhongguo Jixie Gongcheng/China Mechanical Engineering |
| Volume | 31 |
| Issue number | 3 |
| DOIs | |
| State | Published - 10 Feb 2020 |
| Externally published | Yes |