Surface alloying using tungsten disulphide powder mixed in dielectric in micro-EDM on Ti6Al4V

International Conference on Mechanical, Materials and Renewable Energy

机械制造;材料科学;能源学

Mohanty, Shalini^1 ; Kumar, Vishnu^1 ; Tyagi, Rashi^1 ; Kumar, Shakti^1 ; Bhushan, Brij^1 ; Das, Alok Kumar^1 ; Dixit, Amit Rai^1

Department of Mechanical and Mining Machinery Engineering, Indian Institute of Technology (ISM), Dhanbad, Jharkhand

826004, India^1

关键词: Field emission scanning electron microscopes;    Lubricating powder;    Lubrication characteristics;    Material removal rate;    Micro electrical discharge machining;    Process parameters;    Self-lubricating properties;    Tungsten disulphide;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/377/1/012040/pdf
DOI  :  10.1088/1757-899X/377/1/012040

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Surface alloying has been popular in recent days for the surface modification of machining components. The present involves the practical application of micro electrical discharge machining (μ-EDM) process with powders mixed in the dielectric fluid for surface alloying applications. The experiments were carried out on Ti6Al4V sheets using tungsten tool with the use of tungsten disulphide (WS2) powders suspended in the de-ionised water as the dielectric medium. Sparks occur in between the tool electrode and the work piece gap on the local region, such that melting takes place. It results in the disassociating the dielectric fluid and the powders mixed within it and hence undergo the process of alloying. Design of experiments was used for carrying out the experiments using Taguchi method where the process parameters were taken in L9 array. The desired parametrical settings adopted was voltage, duty factor and concentration of the powder particles. The EDM alloyed samples undergo field emission scanning electron microscope (FESEM) self-equipped with EDS analysis. In addition to that the surface roughness, material removal rate and micro-hardness was measured. The work relates to the use of lubricating powders in the dielectric fluid such that the alloy formed can give some self-lubricating properties. Results showed formation of recast layer (RL) containing traces of WS2 substrate over the Ti6Al4V work piece surface hence improving the lubrication characteristics of the alloyed material.