Surface martensitization of Carbon steel using Arc Plasma Sintering

International Conference and Exhibition in Advanced Materials and Microscopy 2017

材料科学;物理学

Wahyudi, Haris^1 ; Dimyati, Arbi^2 ; Sebayang, Darwin^1

Mechanical Engineering Department, Faculty of Engineering, Mercu Buana University, Jakarta, Indonesia^1

Center for Science and Technology for Advanced Materials, PSTBM, Batan, Indonesia^2

关键词: After-treatment;    Energy dispersive X ray spectroscopy;    Martensitic structures;    New technologies;    Plasma exposure;    Pulsed currents;    Surface structure modification;    Vickers microhardness;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/343/1/012032/pdf
DOI  :  10.1088/1757-899X/343/1/012032

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this paper new technology of surface structure modification of steel by short plasma exposure in Arc Plasma Sintering (APS) device is presented. APS is an apparatus working based on plasma generated by DC pulsed current originally used for synthesizing materials via sintering and melting. Plasma exposure in APS was applied into the specimens for 1 and 3 seconds which generate temperature approximately about 1300-1500°C. The SUP9, pearlitic carbon steel samples were used. The hardness, hardening depth and microstructure of the specimens have been investigated by Vickers micro hardness test and Scanning Electron Microscopy (SEM) supported by Energy Dispersive X-Ray Spectroscopy (EDX). The results have showed that the mechanical property was significantly improved due to the formation of single martensitic structures as identified by SEM. The hardness of treated surface evaluated by Vickers hardness test showed significant improvement nearly three time from 190 VHN before to 524 VHN after treatment. Furthermore, EDX confirmed that the formation of martensite layer occurred without altering its composition. The APS also produced uniform hardened layer up to 250 μm. The experiment has demonstrated that arc plasma process was successfully improved the mechanical properties of steel in relatively very short time.