Abstract
In this research, ball-on-plate reciprocating sliding wear tests were conducted on shot-peened specimens of ductile iron heat treated by either austempering or quench-tempering. Hardness and microstructure were evaluated to understand the phase transformation, and X-ray diffraction was used to measure the residual stress. It was found that feather-like ausferrite was formed when using high austempering temperatures. In sliding wear tests, austempered ductile iron specimens had better wear resistance than quench-tempered ductile iron specimens before and after receiving shot-peening. Crack and adhesive wear were the two main wear mechanisms on ductile iron specimens. The shot-peening resulted in the increase of residual compressive stress and surface hardness, which could retard the nucleation and propagation of cracks and reduce the amount and size of smeared areas.
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