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Chinese Journal of Materials Research  2016, Vol. 30 Issue (6): 473-480    DOI: 10.11901/1005.3093.2015.730
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Cavitation Erosion of 304 Stainless Steel induced by Caviting Water Jet
WU Congqian, REN Ruiming, LIU Pengtao, CHEN Chunhuan, ZHAO Xiujuan*()
College of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
Cite this article: 

WU Congqian, REN Ruiming, LIU Pengtao, CHEN Chunhuan, ZHAO Xiujuan. Cavitation Erosion of 304 Stainless Steel induced by Caviting Water Jet. Chinese Journal of Materials Research, 2016, 30(6): 473-480.

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Abstract  

Cavitation erosion of 304 stainless steel was studied by means of caviting water jet (CWJ) with varying stress and time. By tracking the surface morphology change with scanning electron microscope after the CWJ treatment, the process and mechanism of cavitation erosion were analyzed and the microstructure evolution of the surface and the relevant deformation mechanism were investigated as well. The results are as follows: according to the difference in damage rate and mechanism, the cavitation damage zone can be divided into jet impact zone, transition zone and turbulent zone from the center to the periphery, among them, the damage degree of jet impact zone was the worst, transition zone was the weakest. The damage of jet impact zone was accelerated by the jet pressure 35 MPa for 40 min, and it presented clear characteristics of fatigue damage, the initiation and propagation of fatigue crack in the area of slip band and grain boundary is one of the important reasons leading to the spalling damage; The twin layer of the transition zone and turbulent zone were thicker than that of the jet impact zone in the cross-sectional microstructure, and the thickness of the twin layer in turbulent zone was 140 μm; Under the conditions of this experiment, the main deformation mode of 304 stainless steel is slip deformation, the second is twin deformation. There are two kinds of mechanism of cavitation erosion induced by the cavitating water jet, one is fatigue failure under cyclic loading, the other is arc-shaped pit caused by plastic deformation, necking and spalling.

Key words:  metallic materials      cavitating water jet      cavitation erosion      slip band      twin      304 stainless steel     
Received:  15 December 2015     
ZTFLH:  TG141  
About author:  *To whom correspondence should be addressed, Tel: (0411)84106863, E-mail: zhaoxj@djtu.edu.cn

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2015.730     OR     https://www.cjmr.org/EN/Y2016/V30/I6/473

Fig.1  Macroscopic damage morphologies of the test specimen after water jet process under 35 MPa for 60 min
Fig.2  Schematic diagram of submerged cavitating water jet
Fig.3  Surface morphologies observation of water jet impact zone under 35 MPa for (a) 10 min; (b) 20 min; (c) 50 min; (d) 60 min
Fig.4  Morphology of slip band in water jet impact zone after water jet process under 35 MPa for 10 min (a) and (b) enlarged image of A zone in Fig.a
Fig.5  Morphologies of the turbulent zone after water jet process under 35 MPa for (a) 30 min; (b) 60 min
Fig.6  Morphologies of water jet impact zone treated for 60 min under (a) 0 MPa; (b) 25 MPa; (c) 30 MPa; (d) 35 MPa
Fig.7  Evalution of microhardness (a) and surface roughness (b) of specimen in water jet impact zone under 35 MPa
Fig.8  Cross-sectional morphologies of (a) water jet impact zone; (b) transition zone and (c) turbulent zone of the specimen after water jet process under 35 MPa for 50 min
Fig.9  Different damage actions in cavitation process (a) crack propagation on the cross-section under 30 MPa for 120 min; (b) schematic diagram of fatigue crack growth; (c) plastic deformation pit on the surface under 30 MPa for 10 min
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