标题：Microstructure and room-temperature dry sliding wear behavior of GCr15 steel treated by surface induction hardening
作者：Wang, Ze-Ning ;Cui, Hong-Zhi ;Zhang, Guo-Song ;Wang, Wei ;Sun, Jin-Quan ;Cheng, Gui-Qin
作者机构：[Wang, Ze-Ning ;Cui, Hong-Zhi ;Zhang, Guo-Song ;Wang, Wei ;Sun, Jin-Quan ] School of Materials Science and Engineering, Shandong University of Science 更多
来源：Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment
摘要：Effects of surface induction hardening on microstructure and wear mechanism of GCr15 steel used for ball screw were studied. The microstructure and fracture morphology of the surface treated steel samples were examined by scanning electron microscopy(SEM). The microhardness distribution and the phase of hardened region were characterized by Vickers hardness test and X-ray diffraction(XRD), respectively. Dry sliding wear behavior of the hardened steel was subsequently investigated by using a reciprocating ball-on-flat apparatus under different loads. The friction coefficient was measured, and worn surface and wear debris were observed by SEM and EPMA. The results show that the hardened zone is mainly composed of cryptocrystalline martensite, residual austenite and disperse granular carbides. SEM fractographs show different morphology of impact fracture from the hardened surface to the core of the specimen. Friction coefficient decreases with increasing load. At the low load just shallow scuffs and a spot of torn-off carbide particles are observed on the surface, slight abrasive wear is the dominant wear mechanism. At the middle load, the wear mechanism involves a combination of abrasive wear and mild delamination wear. However, at the high load, deep grooves and large flakes are observed, the wear mechanism is recognized as the mixture of serious abrasion wear and delamination wear. © 2015, Editorial Office of TRANSACTIONS OF MATERIALS AND HEAT TREATMENT. All right reserved.