Evolution of Microstructure and Mechanical Properties of 20Cr13 Under Cavitation Erosion
Evolution of microstructure and mechanical properties of 20Cr13 was studied. Evolution of microstructure was researched by using optical, scanning electron, 3D measuring laser microscope to describe the changes. To explore cavitation erosion process as a fatigue damage, residual stress, micro hardness and roughness were measured by X-ray diffraction analysis, Vickers micro hardness tester and roughness tester respectively. The results showed that micro hardness and residual stress increased for deformation in the early period of cavitation erosion, then decreased gradually because of spalling. Microstructure got increasingly long strips and large holes which turned into cracks. And roughness kept growing with time increasing. The cavitation resistance of 20Cr13 has been decreasing during the 240 min of cavitation erosion, which may be related to the decreasing of micro hardness and the increasing of roughness and residual stress. And that cavitation erosion process was seen as a fatigue damage seems reasonable from damage evolution of depth in microstructure and residual stress.
KeywordsCavitation erosion Fatigue damage Microstructure Residual stress
This work is carried out under the financial support of one project of the National Key R&D Program of China (No.2016YFF0203301).
- 1.Brennen CE (2012) Hydrodynamics of pumps. Jiangsu University Press, Zhenjiang (in Chinese)Google Scholar
- 5.Adoption PN (2003) Centrifugal pumps for petroleum, petrochemical and natural gas industriesGoogle Scholar
- 12.Brennen CE (1995) Cavitation and bubble dynamics. Cambridge University Press, New YorkGoogle Scholar
- 17.Schijve J (2004) Fatigue of structures and materials. Aviation Industry Press, BeijingGoogle Scholar
- 19.ASTM NG (2003) Standard test method for cavitation erosion using vibratory apparatus. ASTMGoogle Scholar