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Gautam, Jai Prakash
- Laser Welding of Ultrafine Bainitic Steels
Abstract Views :302 |
PDF Views:7
Authors
V. S. M. Ramakrishna R.
1,
Jai Prakash Gautam
2,
G. Madhusudhan Reddy
3,
P. Masthanaiah
4,
K. Bhanu Sankara Rao
5
Affiliations
1 Mahatma Gandhi Institute of Technology, Gandipet, Hyderabad - 500 075, IN
2 School of Engineering Sciences and Technology, University of Hyderabad - 500 046, IN
3 Defence Metallurgical Research Laboratory, Hyderabad - 500 058, IN
4 Defence Research Development Laboratories, Hyderabad - 500 058, IN
5 Ministry of Steel Chair Professor, MGIT, Hyderabad - 500 075, IN
1 Mahatma Gandhi Institute of Technology, Gandipet, Hyderabad - 500 075, IN
2 School of Engineering Sciences and Technology, University of Hyderabad - 500 046, IN
3 Defence Metallurgical Research Laboratory, Hyderabad - 500 058, IN
4 Defence Research Development Laboratories, Hyderabad - 500 058, IN
5 Ministry of Steel Chair Professor, MGIT, Hyderabad - 500 075, IN
Source
Indian Welding Journal, Vol 52, No 3 (2019), Pagination: 52-56Abstract
Laser beam welding (LBW) is one of the advanced welding process which results in joining of materials with intense heat. The intense heat is produced using focused light source falling upon the metallic material’s surfaces to be welded. The coherent laser beam is a known source of electromagnetic energy or light with single frequency which can be projected without diverging and also can be focused to an exact spot. The current investigation aims at establishing the parameters required for producing sound welds by fibre laser beam welding and identifying the evolution of microstructure in bainitic steel during similar welding of three mm thick plates. Sound welding was accomplished with laser power 3.5kW and at traverse speeds of 2000, 3000 and 4000 mm/min. The weld joints revealed base metal, weld zone and heat affected zones. The widths of weld zone and HAZ varied as a function of welding speed. Weld zone displayed hardness around 750-800 VHN. A sudden drop in hardness was observed across the heat affected zone, reaching a dip in the intercritical region of HAZ. Hardness in ICHAZ reached around 400-450VHN. The ICHAZ was more pronounced at 3000 mm/min. Microstructural changes were explored by optical microscopy techniques. The high hardness in fusion zone and low hardness in the intercritical structure was found to have correlation with prevailing microstructural features in the respective zones.
Keywords
Bainitic Steel, Fibre Laser Welding, Fusion Zone, Heat Affected Zone, Intercritical Structure, Hardness.
References
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- Study of Weld Geometry, Microstructure and Hardness of Fibre Laser Welded Dual Phase Steel
Abstract Views :275 |
PDF Views:7
Authors
P. V. S. Lakshminarayana
1,
Jai Prakash Gautam
2,
P. Mastanaiah
3,
G. Madhusudan Reddy
4,
K Bhanu Sankara Rao
1
Affiliations
1 Department of Metallurgical and Materials Engineering, Mahatma Gandhi Institute of Technology, Gandipet, CBES P.O. Hyderabad- 500075, IN
2 SEST, University of Hyderabad, IN
3 DRDL, Hyderabad, IN
4 Defence Metallurgical Research Laboratory, Hyderabad, IN
1 Department of Metallurgical and Materials Engineering, Mahatma Gandhi Institute of Technology, Gandipet, CBES P.O. Hyderabad- 500075, IN
2 SEST, University of Hyderabad, IN
3 DRDL, Hyderabad, IN
4 Defence Metallurgical Research Laboratory, Hyderabad, IN
Source
Indian Welding Journal, Vol 52, No 4 (2019), Pagination: 66-72Abstract
Laser weld beads were produced on Dual Phase 600 grade steel sheets of 1.6 mm thickness using Nd: YAG fibre lasers. Influence of welding speed and laser beam power on variations in the weld geometry and Microstructure, and its correlation with the mechanical properties was studied. Welding speed has a greater influence on the width of the weld zone and Heat Affected Zone, and depth of penetration than beam power. Rapid cooling rates associated with the weld zone resulted in the formation of martensite phase and a decrease in the volume fraction of martensite was observed with an increase in the distance from the weld zone. Microhardness of the weld zone increased to 360 - 380 HV from 180 - 200 HV.Keywords
Dual Phase Steel, Fibre Laser Welding, Fusion Zone, Heat Affected Zone, Beam Power, Traverse Speed.References
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