EFFECT OF DEEP ROLLING BEHAVIOR OF SINTERED METAL ON FATIGUE LIFE TIME

Sai-yan  Primee; Naratorn  Rongpol; Tada  Parekrathok

Authors

Sai-yan Primee Department of Production Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand.
Naratorn Rongpol Department of Production Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand.
Tada Parekrathok Department of Production Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand.

Keywords:

Sintered metal, deep rolling, fatigue, work hardening

Abstract

In this study, the effect of deep rolling on the near surface properties and microstructure of sintered metal was investigated. A metal surface treatment on the surface of sintered metal was found to improve the following attributes: sub-surface hardness, compressive residual stress, and dislocation density with a reduction of surface roughness and porosities on the near surface. It was also demonstrated that the compactness and hardness are improved by increasing the deep rolling force. Compressive residual stresses and work hardening states are suggested to inhibit surface crack initiation and crack propagation, resulting in an improvement of the fatigue resistance of sintered metals.

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