On the impacts of grain refinement and strain-induced deformation on three-body abrasive wear responses of 18Cr-8Ni austenitic stainless steel

摘要

The concept of phase reversion annealing involving cold deformation of metastable austenite to strain-induced martensite, followed by annealing was adopted to obtain fine grained 18Cr-8Ni austenitic stainless steel. The primary objective of the present study was to elucidate the wear performance of fine-grained austenitic stainless steel through three-body abrasive wear tests at room and high temperatures and compare with the coarse-grained counterpart. The quartzite stones (quartz content over 90 wt%) with diameter 5-15 mm and hardness of 1100HV were used as the abrasive in three-body abrasive wear tests. The study demonstrated that the microstructure consisting of near defect-free and equiaxed fine austenite grains with high yield strength and elongation exhibited superior wear resistance at high temperature (250 degrees C), which is attributed twinning induced plasticity deformation in fine austenite grains. The wear mechanism varied as a function of distance from the center of the steel sample and was characterized by microploughing and microcutting.