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Basu, Somnath
- Surface Modification of High Carbon Steel by Autogenous Pulsed Tungsten Inert Gas Arcing
Abstract Views :391 |
PDF Views:9
Authors
Affiliations
1 Uttarakhand Technical University, Dehradun, IN
2 IIT, Roorkee, IN
3 DIT University, Dehradun, IN
1 Uttarakhand Technical University, Dehradun, IN
2 IIT, Roorkee, IN
3 DIT University, Dehradun, IN
Source
Indian Welding Journal, Vol 49, No 3 (2016), Pagination: 70-80Abstract
Pulsed Tungsten Inert gas arcing (PTIGA) has been employed at various pulse parameters keeping the energy input constant for surface modification of high carbon steel (En-31) by controlled fusion. Analytical studies on thermal cycle and isotherm of fused surface have been carried out to predict microstructure of the fusion and heat affected zones. The analytical predictions have been verified by the experimental observations of modified surface characteristics. The ability of PTIGA process to control the energy input and its distribution Significantly influences the solidification behavior, nature of phase transformation and morphology of various phases in the matrix. It happens due to influence of arcing over the depth of fusion and cooling characteristics of matrix during solidification. Optimization of pulse parameters of the PTIGA process allows surface modification of En-31 steel plate with significantly improved hardness avoiding hot crackin.Keywords
Pulsed TIG Arcing, High Carbon Steel, Controlled Fusion, Thermal Characteristics, Microstructure, Hardness.
- Study of Effect of Gas Tungsten Pulse Arcing on Surface Modification of Martensitic Stainless Steel
Abstract Views :413 |
PDF Views:10
Authors
Affiliations
1 Uttarakhand Technical University, Dehradun, IN
2 Department of Metallurgical and Materials Engineering, IIT Roorkee, IN
3 DIT University, Dehradun, IN
1 Uttarakhand Technical University, Dehradun, IN
2 Department of Metallurgical and Materials Engineering, IIT Roorkee, IN
3 DIT University, Dehradun, IN
Source
Indian Welding Journal, Vol 50, No 2 (2017), Pagination: 68-77Abstract
Heat energy generated from Gas Tungsten Pulse Arcing process has been used for surface modification of martensitic stainless steel. Arcing was carried out with varied pulse parameters with heat input maintained constant. Variations were observed in heating and cooling patterns of the fused zone. Their effects on fusion, solidification and consequent influence on microstructure of the fused material have been studied. The Temperature Vs. Time curve and isotherm of the fused zone have been analytically drawn. They are used to predict microstructural changes in the fused and adjacent heat affected zone of modified surface. The theoretical predictions are verified by the relevant observations on the modified surfaces. Improvement in hardness of fused zone compared to base material has been studied in conformity with the microstructural changes of the modified matrix.Keywords
Stainless Steel, Thermal Analysis, Fusion Geometry, Microstructure, Hardness.References
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