Surface Modification of Ti-6Al-4V by Gas-liquid Mixed EDM

2021 ◽  
Author(s):  
Wei Zhang ◽  
Li Li ◽  
Ning Wang ◽  
Jianbing Meng ◽  
Jianhua Ren
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Electrical Discharge Machining ◽  
Sample Surface ◽  
Recast Layer ◽  
Micro Hardness ◽  
Hard Phase ◽  
Nitrogen Gas ◽  
The Matrix ◽  
Edm Process

Abstract Ti-6Al-4V alloy is widely used in many fields due to its excellent properties. However, its further applications is limited by its low hardness and poor wear resistance. In this paper, gas-liquid mixed electrical discharge machining (EDM) process was applied for surface modification of Ti-6Al-4V alloy. The multi-hole electrode was adopted to flow nitrogen to mix nitrogen with special spark oil. The effect of different parameters (peak current and pulse duration) on surface morphology, cross section morphology, micro hardness and wear resistance were investigated. The results indicated that the gas-liquid mixed EDM process has better performance on sample surface with fewer pores and shallow craters. A continuous and thick recast layer was obtained by gas-liquid mixed EDM process and N element was migrated to the sample surface from nitrogen gas. The XRD results demonstrated that TiN hard phase was formed on the sample surface, thus the micro hardness was nearly three times higher than that of the matrix, reaching 1329.5HV, and the wear resistance is improved accordingly. The surface of Ti-6Al-4V alloy was modified by gas-liquid mixed EDM process.

Research on Process Optimization and Abrasion Resistance of Plasma Spraying Al2O3-13wt%TiO2 Coating

2013 ◽  
Vol 341-342 ◽  
pp. 92-95
Author(s):  
Li Jun Wang ◽  
Jian Jun Hao ◽  
Yue Jin Ma ◽  
Jian Guo Zhao ◽  
Jian Chang Li
Keyword(s):  
Wear Resistance ◽  
Plasma Spraying ◽  
Friction And Wear ◽  
Performance Test ◽  
Sample Surface ◽  
Coating Performance ◽  
The Matrix ◽  
Average Wear ◽  
And Performance ◽  
Spraying Process

Using plasma spraying equipment to prepare Al2O3-13wt%TiO2 coating on Q235 substrate. Study of its organization and performance, test the performance of coating microhardness and the resistance of friction and wear resistance then optimize the spraying process parameters. The surface of the coating performance was studied by SEM. The results show that, Coating microhardness can be as high as 1132HV, Far more than the matrix microhardness. The minimum average wear weightlessness of Sample surface is 0.95mg. Greatly improve the wear resistance

scholarly journals Processing Characteristics of Micro Electrical Discharge Machining for Surface Modification of TiNi Shape Memory Alloys Using a TiC Powder Dielectric

Micromachines ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 1018
Author(s):  
Ziliang Zhu ◽  
Dengji Guo ◽  
Jiao Xu ◽  
Jianjun Lin ◽  
Jianguo Lei ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Modification ◽  
Shape Memory ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Recast Layer ◽  
Powder Concentration ◽  
Micro Electrical Discharge Machining ◽  
Machining Properties

Titanium-nickel shape memory alloy (SMA) has good biomedical application value as an implant. Alloy corrosion will promote the release of toxic nickel ions and cause allergies and poisoning of cells and tissues. With this background, surface modification of TiNi SMAs using TiC-powder-assisted micro-electrical discharge machining (EDM) was proposed. This aims to explore the effect of the electrical discharge machining (EDM) parameters and TiC powder concentration on the machining properties and surface characteristics of the TiNi SMA. It was found that the material removal rate (MRR), surface roughness, and thickness of the recast layer increased with an increase in the discharge energy. TiC powder’s addition had a positive effect on increasing the electro-discharge frequency and MRR, reducing the surface roughness, and the maximum MRR and the minimum surface roughness occurred at a mixed powder concentration of 5 g/L. Moreover, the recast layer had good adhesion and high hardness due to metallurgical bonding. XRD analysis found that the machined surface contains CuO2, TiO2, and TiC phases, contributing to an increase in the surface microhardness from 258.5 to 438.7 HV, which could be beneficial for wear resistance in biomedical orthodontic applications.

Effect on Microstructure and Hardness of Plunger Piston of Fe-Based Composite Coating by Laser Cladding

2011 ◽  
Vol 189-193 ◽  
pp. 830-833
Author(s):  
Yong Tao Zhao ◽  
Wen Xue Li ◽  
Jun Wei Zhou
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Second Phase ◽  
Micro Hardness ◽  
Hardness Testing ◽  
Matrix Metal ◽  
Cladding Layer ◽  
Hard Particles ◽  
The Matrix ◽  
Metal Microstructure

The laser cladding of Fe power technology was used to repair worn plunger piston surface. The microstructure of cladding layer, binder course and the matrix were observed by OM and SEM. Besides, the micro-hardness of different zones was measured through micro-hardness testing. The results show that the matrix metal microstructure of plunger piston is made of ferrite and austenite. By laser cladding Fe-based power on base metal, the cladding layer grain is fine and uniform, grain growth has obvious direction and finally become dendrites oriented, the microstructure of cladding layer is both second-phase hard particles and Fe-based solutes. The combination between matrix and cladding layer is smooth, belong to metallurgy bonding. The hardness of cladding layer is higher than that of other parts in three parts, the max value of micro-hardness is about 1250HV, it can agree with wear resistance need of plunge piston surface.

Experimental investigations on surface integrity issues of Inconel-690 during wire-cut electrical discharge machining process

2016 ◽  
Vol 232 (4) ◽  
pp. 731-741 ◽  
Author(s):  
M Sreenivasa Rao ◽  
N Venkaiah
Keyword(s):  
Surface Roughness ◽  
Layer Thickness ◽  
Process Parameters ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Recast Layer ◽  
Machining Process ◽  
Micro Hardness ◽  
Recast Layer Thickness ◽  
Inconel 690

Nickel-based alloys are finding a wide range of applications due to their superior properties of maintaining hardness at elevated temperatures, low thermal conductivity and resistance to corrosion. These materials are used in aircraft, power-generation turbines, rocket engines, automobiles, nuclear power and chemical processing plants. Machining of such alloys is difficult using conventional processes. Wire-cut electrical discharge machining is one of the advanced machining processes, which can cut any electrically conductive material irrespective of its hardness. One of the major disadvantages of this process is formation of recast layer as it affects the properties of the machined surfaces. In this study, experimental investigation has been carried out to study the effect of wire-cut electrical discharge machining process parameters on micro-hardness, surface roughness and recast layer while machining Inconel-690 material. Interestingly, hardness of the machined surface was found to be lower than that of the bulk material. The micro-hardness and recast layer thickness are inversely related to the variation of process parameters. Recast layer thickness, surface roughness and hardness of the wire-cut electrical discharge machined surfaces of Inconel-690 are found to be in the range of 10–50 µm, 0.276–3.253 µm and 122–171 HV, respectively, for different conditions. The research findings and the data generated for the first time on hardness and recast layer thickness for Inconel-690 will be useful to the industry.

Research on the Performance of Ultrasonic Vibration Assisted Electrical Discharge Surface Modification Layer

2010 ◽  
Vol 171-172 ◽  
pp. 408-411
Author(s):  
Chun Jie Dong ◽  
Jian Hua Zhang ◽  
Xi Chao Song
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
Surface Modification ◽  
Ultrasonic Vibration ◽  
Electrical Discharge ◽  
Vibration Amplitude ◽  
Experimental Results ◽  
Tool Electrode ◽  
Micro Hardness ◽  
Melting Material

Ultrasonic vibration assisted electrical discharge surface modification was studied in the paper. The influence of ultrasonic vibration amplitude and frequency on the modification layer performance, such as surface roughness, sectional morphology, micro hardness and wear resistance was investigated. Experimental results show that ultrasonic vibration assisted electrical discharge surface modification can improve surface roughness and make the melting material well-distributed. The surfaces have higher micro hardness and wear resistance when the tool electrode is assisted with ultrasonic vibration.

MICRO-HARDNESS AND WEAR-RESISTANCE INVESTIGATION IN CARBO-METAL COATING COMPOSITES OBTAINED THROUGH GAS-DETONATION METHOD

2020 ◽  
Vol 2020 (10) ◽  
pp. 29-36
Author(s):  
Ol'ga Sil'chenko ◽  
Marina Siluyanova ◽  
Petr Hopin
Keyword(s):  
Wear Resistance ◽  
Wear Intensity ◽  
Micro Hardness ◽  
Gas Detonation ◽  
Coating Application ◽  
The Matrix ◽  
Detonation Method ◽  
Hardness Increase ◽  
Quasi Crystals ◽  
Result Analysis

The work purpose consists in the investigation of carbometal coatings wear-resistance and micro-hardness depending on chemical structure of their components. The investigation object is carbide-metal coatings. The result analysis of comparative wear-resistance tests witnesses that with micro-hardness increase in metal carbides of compositions: Cr3C2, WC, TiC, TiCN, at a constant content of cladding metal (30…35mass %), a value of wear decreases according to the linear law. Wear intensity of coatings of clad carbide mixtures with different materials is defined to a certain extent with wear intensity of material added to the matrix. In the course of the work there were developed coating compositions reinforced with quasi-crystals, there is defined an optimum composition and modes of coating application with the gas-detonation method and their wear-resistance and micro-hardness were investigated.

Fabrication and Characterisation of Powder Metallurgy Fe-Cr Matrix Composites Reinforced with Al2O3

2013 ◽  
Vol 686 ◽  
pp. 157-163
Author(s):  
Saidatulakmar Shamsuddin ◽  
Shamsul Baharin Jamaludin ◽  
Zuhailawati Hussain ◽  
Zainal Arifin Ahmad
Keyword(s):  
Wear Resistance ◽  
Compressive Strength ◽  
Powder Metallurgy ◽  
Sintering Temperature ◽  
Compaction Pressure ◽  
Powder Metallurgy Method ◽  
Matrix Composites ◽  
Micro Hardness ◽  
Sintered Powder ◽  
The Matrix

Abstract. Sintered powder metallurgy Fe based composites with advanced mechanical properties have been proposed as substitutes for more expensive cemented carbide and wrought alloys in many applications, especially as inexpensive wear resistance parts. The aim of this work was to fabricate and characterize a composite made of Fe-Cr as the matrix and Al2O3 particles as reinforcement. The composite was made by powder metallurgy method. The effect of different amount of binder, mixing duration, compaction pressure and sintering temperature has been investigated. Densification, micro hardness, wear resistance and compressive strength were used to characterize the composite. Powder metallurgy parameters that satisfy the composites quality have been optimized and result showed that higher sintering temperatures promote good sintering in the composites which produced better densification, higher reading of micro hardness, better wear resistance and compressive strength.

Effect of Powder Mixed Electrical Discharge Machining (PMEDM) on Difficult-to-machine Materials – a Systematic Literature Review

2014 ◽  
Vol 14 (4) ◽  
pp. 233-255 ◽  
Author(s):  
Rajiv Sharma ◽  
Jagdeep Singh
Keyword(s):  
Surface Modification ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Considerable Improvement ◽  
The Novel ◽  
Slow Pace ◽  
Successful Technique ◽  
Novel Applications ◽  
Edm Process ◽  
Powder Mixed Edm

AbstractThe last decade has witnessed an increasing interest in the novel applications of electrical discharge machining (EDM) process. Due to the continuous efforts by the researchers many innovations have been made to improve the performance of EDM process. Among various EDM variants, powder EDM is one of the successful technique, which shows the considerable improvement in the performance of EDM by increasing the MRR and surface finish as both of these responses are mainly considered by the industries. Despite the better processing results, powder mixed EDM process is used in industry at slow pace. Therefore, with a vast future scope of powder EDM in areas of machining and surface modification of difficult-to-machine materials, authors in this paper explored all the parameters and terms related with powder mixed EDM process. The main aim of the paper is to help the researchers to understand this concept thoroughly and research the process parameters further in more details to get more improvements in the process resulting in achieving desired quality levels.

Effect of SiC-Cu Electrode on Material Removal Rate, Tool Wear and Surface Roughness in EDM Process

2020 ◽  
Vol 38 (9A) ◽  
pp. 1406-1413
Author(s):  
Yousif Q. Laibia ◽  
Saad K. Shather
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Material Removal Rate ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
304 Stainless Steel ◽  
Tool Electrode ◽  
Pulse Time ◽  
Edm Process

Electrical discharge machining (EDM) is one of the most common non-traditional processes for the manufacture of high precision parts and complex shapes. The EDM process depends on the heat energy between the work material and the tool electrode. This study focused on the material removal rate (MRR), the surface roughness, and tool wear in a 304 stainless steel EDM. The composite electrode consisted of copper (Cu) and silicon carbide (SiC). The current effects imposed on the working material, as well as the pulses that change over time during the experiment. When the current used is (8, 5, 3, 2, 1.5) A, the pulse time used is (12, 25) μs and the size of the space used is (1) mm. Optimum surface roughness under a current of 1.5 A and the pulse time of 25 μs with a maximum MRR of 8 A and the pulse duration of 25 μs.

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