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Investigation of Microstructure and Wear Properties of Plasma Nitrided Astaloy Mo
Mahsa Haji Ghasemi,Behrooz Ghasemi,Hamid Reza Mohamadian Semnani 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
In this research, plasma nitridation is carried out on the as-sintered and hardened Astaloy Mo in order to improve the wearbehavior of PM parts. The starting materials including pre-alloyed powders with 0.8% graphite were pressed at diff erentpressures. Next, the specimens were sintered at 1120 °C for 30 min, in the N 2 /H 2 atmosphere. The eff ects of density and coolingrate were studied on the microhardness, microstructure, and wear performance of as-sintered and hardened specimens. X-ray technique, scanning electron microscopy, and energy dispersive spectroscopy were used for phase transformation,morphology characterization, and elemental analysis, respectively. The results showed that plasma nitridation and an increasein cooling rate and density up to 6.8 g/cm 3 resulted in a change in wear resistance. Moreover, the wear performance of densesamples was decreased due to the enhanced three-body abrasive mechanism.