Failure analysis of camshaft for marine diesel engines and composite shot peening strengthening treatment

doi:10.13251/j.issn.0254-6051.2025.04.045

Abstract

Abstract: Failure analysis was conducted on the spalling problem of cam tip of a marine diesel engine camshaft after durability cycle testing, and a composite shot peening strengthening method was proposed to improve the contact fatigue strength of the camshaft. The results show the microstructure, hardness and hardened layer depth of the camshaft are all within the normal range, and the failure cause of the camshaft is contact fatigue spalling. After composite shot peening by using ceramic shot (0.15A)+glass shot (0.07A), the residual compressive stress distribution on the cam surface is uniform. The residual compressive stress in the surface layer is increased to 1284 MPa, and that in the subsurface layer is increased to 1322 MPa. The retained austenite content in the surface layer is reduced to 0.8%, and the surface hardness is increased to 971 HV0.05. This indicates that the composite shot peening strengthening can effectively solve the problem of contact fatigue spalling of the camshaft.

Key words: camshaft, contact fatigue spalling, composite shot peening, residual stress, hardness

CLC Number:

TG146.1

Yao Yajun, Wu Xinbo, Luo Changzeng, Li Chengyan, Xu Deshi, Jiang Chuanhai. Failure analysis of camshaft for marine diesel engines and composite shot peening strengthening treatment[J]. Heat Treatment of Metals, 2025, 50(4): 290-295.

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