نوع مقاله : مقاله پژوهشی
1 کارشناسی ارشد، مرکز تحقیقات مواد پیشرفته، دانشکده مهندسی مواد، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
2 عضو هیات علمی دانشگاه ازاد اسلامی
عنوان مقاله [English]
IIn this research, the microstructure, phase-analysis, hardness and wear behavior of cladded carbon steel of St-52 by a high chromium-carbon electrode with or without using 309-stainless steel as a middle layer are investigated. Cladding process is performed by shield-metal arc welding (SMAW) and gas-tungsten arc welding (GTAW) methods. In order to evaluate of microstructure, the optical and scanning electron microscopies along with EDS analyses are used. In addition, hardness measurement and wear behavior are conducted by micro-Vickers hardness and dry- sliding wear test, respectively. The research findings show that the microstructure of cladded samples are consisted of M7C3 carbides into the eutectoid matrix of Ɣ+ M7C3. Additionally, the volume fraction of carbides are increased at the cladded sample with middle layer of 309-stainless steel as opposed to other samples. Increasing of carbides percentage at the cladded samples with middle layer are caused to enhanced of hardness and wear resistance with comparing to other samples. In this case, the surface hardness and weight loss of wear test are achieved from 780HV and 3.7mg to 945HV and 2mg at the cladded sample without and with middle layer of 309-stainless steel, respectively. Moreover, examining the wear surfaces indicated the occurrence of an adhesive wear mechanism in the specimens. Also, by increasing the hardness in middle layer sample the amount of adhesive wear decreased.