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Enhanced mechanical performance of fusion zone in laser beam welding joint of molybdenum alloy due to solid carburizing
- Source :
- Materials & Design, Vol 181, Iss, Pp-(2019)
- Publication Year :
- 2019
- Publisher :
- Elsevier, 2019.
-
Abstract
- It is unable to strengthen molybdenum (Mo) through solid-state phase transformation, while exploring the effect of carbon (C) on microstructures and properties of fusion zone (FZ) of laser beam welding (LBW) joints of Mo alloy with serious grain boundary embrittlement is significant. An analysis was made on changes of bonding strength of grain boundary and precipitates on the grain boundary surface in the FZ of Mo carburized welded joints, and the existing form and strengthening mechanism of carbon. At first, solid carburizing (SC) can achieve the goal of adding the C to welded joints and C mainly appeared as C atoms and Mo2C in Mo alloy. Afterwards, C could increase the grain boundary strength and the plasticity of grains in the FZ. Therefore, the compatibility of deformation at grain boundary and grain interior was improved. Finally, Mo2C distributing at the grain boundary can inhibit the crack propagation during the deformation. As a result, the tensile strength of carburized weld joints rose by 426% compared with that of uncarburized weld joints, meanwhile the above results provide a new idea for the method for strengthening the Mo fusion weld joints. Keywords: Molybdenum, Carbon, Laser beam welding, Grain boundary embrittlement
- Subjects :
- Materials science
Mechanical Engineering
Alloy
Laser beam welding
02 engineering and technology
Welding
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Carburizing
law.invention
Fusion welding
Mechanics of Materials
law
Ultimate tensile strength
engineering
lcsh:TA401-492
General Materials Science
Grain boundary
lcsh:Materials of engineering and construction. Mechanics of materials
Composite material
Deformation (engineering)
0210 nano-technology
Subjects
Details
- Language :
- English
- ISSN :
- 02641275
- Volume :
- 181
- Database :
- OpenAIRE
- Journal :
- Materials & Design
- Accession number :
- edsair.doi.dedup.....1df214033ef588a7bf981aaae8181419