Abstract
Surface integrity is closely related to the service life of parts and components. Effects of four kinds of integration processes on surface integrity and fatigue life are studied. These four integration processes are M (milling), MP (milling and polishing), MPS (milling, polishing and shot-peening), and MPSP (milling, polishing, shot-peening and polishing). When roughness, micro-hardness, residual stress, micro-structure and fatigue were considered after the four integration processes, research results show that MPSP process can obtain the best surface topography and roughness, micro-hardness, and residual stress field distribution; MPSP process has the longest fatigue life, and the fatigue life of MPSP process is about 68 times of M process, 56 times of MP process, and 48 times of MPS process; The fatigue fracture of the specimen after MPSP process is flat, and the depth of the crack initiation site for MPSP specimen is approximately 150μm below the surface.
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