Effect of water jet peening on microstructure and crack propagation of carburized steel

doi:10.13251/j.issn.0254-6051.2020.09.024

Abstract

Abstract: Effect of water jet peening on microstructure and fatigue crack growth rate of carburized layer was studied by water jet peening on the surface of carburized and quenched low carbon steel.The results show that water jet peening with fine glass beads can significantly refine the surface substructure and increase the density of small angle grain boundaries,and also brings effective residual compressive stress to the carburized layer.Under the condition of 300 MPa water pressure and 600 mm/min scanning rate,the residual compressive stress with a depth of about 100 μm and a maximum of 1244 MPa can be achieved and the corresponding surface roughness R_a is 0.195 μm.The results of fatigue crack rate test show that the crack growth rate da/dN has an increasing trend after water jet peening,which is mainly due to the formation of surface compressive stress and the increase of the tensile stress in the center,and the deformation strengthening of the surface layer reduces the plastic zone at the crack tip.

Key words: water jet peening, carburization, microstructure, crack propagation, surface roughness

CLC Number:

TG178

Fan Lei, Zhang Renqi, Li Bo, Wang Lingxu, He Jinhang, Zou Changfei, Liang Yu. Effect of water jet peening on microstructure and crack propagation of carburized steel[J]. Heat Treatment of Metals, 2020, 45(9): 129-133.

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