The Effect of the presence of the middle layer of 309-stainless steel on microstructure and mechanical properties of St-52 carbon steel cladded by high chromium-carbon electrode produced by fusion welding

Barmaki, Mohsen; Amini, Kamran

The Effect of the presence of the middle layer of 309-stainless steel on microstructure and mechanical properties of St-52 carbon steel cladded by high chromium-carbon electrode produced by fusion welding

Document Type : Original Article

Authors

mohsen barmaki ¹

kamran Amini ²

¹ Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

² Islamic Azad University

Abstract

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.

Keywords

High Chromium-Carbon Electrode

St-52 Carbon Steel

Middle Layer of 309-Stainless Steel

Hardfacing

Wear

Subjects