scholarly journals Investigation of Micro-Hardness, Wear Resistance, and Defects of 316L Stainless Steel and TiC Composite Coating Fabricated by Laser Engineered Net Shaping

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 498 ◽  
Author(s):  
Guofu Lian ◽  
Chenmin Zhao ◽  
Yang Zhang ◽  
Xu Huang ◽  
Changrong Chen ◽  
...  
Keyword(s):  
Composite Coating ◽  
Scanning Speed ◽  
Processing Parameters ◽  
Parameters Optimization ◽  
Wear Volume ◽  
Micro Hardness ◽  
Laser Engineered Net Shaping ◽  
Defect Area ◽  
Net Shaping ◽  
Processing Parameters Optimization

The influence of processing parameters in laser engineered net shaping (LENS) on the properties of 316L stainless steel and titanium carbide (TiC) composite coating was studied. The key processing parameters were laser power, scanning speed, TiC powder ratio, and powder feed rate. Mathematical models were developed to investigate the micro-hardness, wear volume, and defect area of the coating. The accuracy of the models was examined by analysis of variance and experimental validation. Results showed that micro-hardness was positively correlated with TiC powder ratio. Increasing TiC powder ratio could reduce the wear volume. In addition, the wear volume displayed an increase then decrease with increasing laser power and decreasing scanning speed. Both scanning speed and TiC powder ratio showed a recognizable impact on the defect area. Reducing the scanning speed and TiC powder ratio can effectively reduce the defect area. The targets for the processing parameters optimization were set to maximize micro-hardness, minimize wear volume, and defect area. The difference between the model prediction value and experimental validation result for micro-hardness, wear volume, and defect area were 0.46%, 4.54%, and 8.82%, respectively. These results provide guidance for the LENS processing parameters optimization in controlling and predicting of 316L/TiC composite coating properties.

Parameters Optimization and Experimental Analysis in High Speed Machining

2012 ◽  
Vol 591-593 ◽  
pp. 480-483
Author(s):  
Huan Lin ◽  
Dong Qiang Gao ◽  
Zhong Yan Li ◽  
Jiang Miao Yi
Keyword(s):  
Genetic Algorithm ◽  
High Speed ◽  
Production Efficiency ◽  
Cutting Parameters ◽  
Processing Parameters ◽  
Parameters Optimization ◽  
High Speed Machining ◽  
Before And After ◽  
Processing Parameters Optimization ◽  
Cutting Parameters Optimization

First of all, in the cutting parameters optimization, according to the different processing conditions, optimization variables selection is different, including production efficiency the objective function and the constraint conditions of the machine tool. And then using genetic algorithm to build a high-speed processing parameters optimization model. The mathematical model explores the best solution through the software Matlab, and gets the optimal combination between the parameters of each cutting; high speed machining cutting parameters provides the reference for the choice of the user. Through the optimization of the comparison of the before and after that, using genetic algorithm cutting parameters optimization, mach inability got obvious improvement, in order to ensure the quality of processing also achieve the maximization of the production efficiency.

Tungsten Inert Gas (TIG) Cladding of TiC-Fe Metal Matrix Composite Coating on AISI 1020 Steel Substrate

2020 ◽  
Vol 1159 ◽  
pp. 19-26
Author(s):  
Anil Kumar Das ◽  
Sujeet Kumar ◽  
Mayank Kumar Chaubey ◽  
Waquar Alam
Keyword(s):  
Composite Coating ◽  
Gas Flow ◽  
Steel Substrate ◽  
Variable Parameter ◽  
Scanning Speed ◽  
Inert Gas ◽  
Hardness Profile ◽  
Micro Hardness ◽  
Gas Flow Rate ◽  
Hardness Tester

TiC – Fe composite coating was produced on AISI 1020 steel by the tungsten inert gas (TIG) cladding process to increase the hardness and wear resistance properties of the substrate. In this paper authors have investigated the effect of process parameters on the microstructure and hardness value of the coated layer. In this TIG cladding process the variable parameter is only current, whereas the other parameters such as scanning speed, standoff distance, and voltage and gas flow rate are fixed. Fe and TiC powders were mixed in the proper ratio of 80wt% - 20wt% and 90wt% - 10wt% respectively. The microstructure and micro-hardness value of the samples were investigated by the scanning electron microscope (SEM) and Vickers micro hardness tester. The result of SEM shows the distribution of the coating powder in the cladded zone. Micro hardness profile shows the variation of the hardness value in the cladded zone as well as in the substrate. The hardness value decreases with increase in distance from top surface of the cladded layer, which is due to difference in cooling rate. Also, the hardness value of cladded layer decreases with increase in current from 140A to 150A. The maximum hardness value of cladded layer was achieved as 262 HV0.05 with 140A current and composition of 90 wt.% - 10wt% (Fe - TiC), which was nearly two times higher than that of the as received AISI 1020 steel substrate. Keywords TIG, Microstructure, Micro hardness, Titanium Carbide (TiC), Iron (Fe) powder.

Processing Parameters Optimization and Experiment Research of Automatic Polishing Technology for Free Surface of Dies

2012 ◽  
Vol 159 ◽  
pp. 198-202
Author(s):  
Dong Ming Li ◽  
Ying Jia ◽  
Xiao Jing Tian ◽  
Xian Ke Ren ◽  
Jun Wei Yin
Keyword(s):  
Free Surface ◽  
Processing Parameters ◽  
Parameters Optimization ◽  
Numerical Control ◽  
Analysis Method ◽  
Automatic Polishing ◽  
Practical Research ◽  
Orthogonal Analysis ◽  
Processing Parameters Optimization ◽  
Machine Processing

Abstract: A kind of automatic polishing equipment for free surface of dies is designed, which is fixed on the backbone of numerical control machine. Processing parameters optimization are gotten by the orthogonal analysis method based on experiment data and surface roughness is about 1.0μm, which provides good basis of practical research and application of accurate working for free surface of dies.

Novel Forming of Ti-6Al-4V by Laser Engineered Net Shaping

2013 ◽  
Vol 765 ◽  
pp. 393-397 ◽  
Author(s):  
Yu Wei Zhai ◽  
Diana A. Lados
Keyword(s):  
Tensile Tests ◽  
Processing Parameters ◽  
Laser Engineered Net Shaping ◽  
Subtractive Manufacturing ◽  
Static Mechanical ◽  
Near Net Shape ◽  
And Performance ◽  
Net Shaping ◽  
3D Digital Models ◽  
Static Mechanical Properties

Titanium alloys offer important weight and performance advantages, but are relatively expensive. Traditional “subtractive” manufacturing causes up to 95% material waste, which makes the manufacturing of titanium components even more expensive. Laser Engineered Net Shaping (LENS) is an effective method of “additively” making components layer-wise, directly from unit materials, based on 3D digital models. Parts fabricated by LENS are net/near-net shape, and therefore, this process minimizes, or even eliminates massive machining costs and material waste. In this study, as-fabricated LENS Ti-6Al-4V test specimens were investigated. The resulting microstructures were extensively characterized and correlated to processing parameters. In addition, room temperature tensile tests were conducted to obtain static mechanical properties and to understand the behaviour at LENS deposition-substrate interface. These results will be presented and discussed.

scholarly journals Analysis of Geometrical Characteristics and Properties of Laser Cladding 85 wt.% Ti + 15 wt.% TiBCN Powder on 7075 Aluminum Alloy Substrate

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1551 ◽  
Author(s):  
Yu-Xin Li ◽  
Peng-Fei Zhang ◽  
Pei-Kang Bai ◽  
Zhan-Yong Zhao ◽  
Bin Liu
Keyword(s):  
Aluminum Alloy ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Linear Regression Analysis ◽  
Electrochemical Corrosion ◽  
Scanning Speed ◽  
Processing Parameters ◽  
7075 Aluminum Alloy ◽  
Micro Hardness ◽  
Geometrical Characteristics

Ti/TiBCN composite coatings were prepared on a 7075 aluminum alloy surface by laser cladding. The relation between the main processing parameters (i.e., laser power, scanning speed, and powder feeding rate) and the geometrical characteristics (i.e., height, width, penetration depth, dilution and wetting angle) of single clad tracks is studied by linear regression analysis. The microstructure, micro-hardness and electrochemical corrosion were investigated by scanning electron microscopy, a Vickers micro-hardness machine, and a standard three-electrode cell, respectively. The results showed that all geometrical track characteristics are observed with high values of the correlation coefficient (R > 0.95). In addition, the average hardness value (750 HV0.2) was obtained of the Ti/TiBCN composite coating, and polarization curves indicated that the composite coatings were harder to corrode than the substrate.

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