|
|
|
| Influence of laser shock processing on high temperature corrosion behavior of 42CrMo alloy steel |
| 1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. China Machinery Industry Federation, Beijing 100823, China； 3. Jingjiang College, Jiangsu University, Zhenjiang, Jiangsu 212013, China； 4. School of Mechanical Engineering, Southeast University, Nanjing, Jiangsu 210096, China |
|
|
|
|
Abstract The laser shock processing(LSP) was carried out for 42CrMo alloy steel with high energy nanosecond pulse laser. Residual stress, hardness and roughness of 42CrMo alloy steel were determined after LSP. The high temperature corrosion tests of untreated and treated samples by LSP were conducted. The surface microtopography of 42CrMo alloy steel was observed by scanning electron microscope(SEM) to investigate the high temperature corrosion resistance of 42CrMo alloy steel. The results show that the corrosion morphology of the specimen after LSP is obviously better than that without LSP. The enhancement of high temperature corrosion resistance of 42CrMo steel after LSP is mainly due to the existence of residual compressive stress layer on material surface, which can inhibit the oxide film from falling off and improve the high temperature corrosion resistance. Compared with small energy laser shock, the large energy impact can greatly increase the compressive residual stress of specimen surface and enhance the influence of residually compressive stress.
|
|
Received: 30 December 2016
|
|
|
|
|
|
|
2018, Vol. 39 
