Estimate of the Residual Stress after Plasma Nitriding of Low Carbon Steel

Welding is a reliable and efficient joining process in which the coalescence of metals is achieved by fusion. Welding is widely employed in diverse structures such as ships, aircraft, marine structures, bridges, ground vehicles, pipelines and pressure vessels. When two dissimilar plates are joined by welding process, a very complex thermal cycle is applied to the weldment, which further causes inhomogeneous plastic deformation and residual stress in and around fusion zone and heat affected zone (HAZ). Presence of residual stresses may be beneficial or harmful for the structural components depending on the nature and magnitude of residual stresses. In this study, a finite element analysis has been carried out to analyze the thermo-mechanical behaviour and effect of residual stress state in butt-welded in low carbon steel plates. A coupled thermal mechanical three dimension finite element model was developed. Finite element method based software SolidWorks Simulation, was then used to evaluate transient temperature and residual stress during butt welding of two plates. Plate thickness of 8 mm were used which are normally joined by multi-pass operation by Manual Metal Arc Welding (MMAW) process. During each pass, attained peak temperature and variation of residual stresses in plates has also been studied. The results obtained by finite element method agree well with those from X-ray diffraction method as published by Murugan et al. for the prediction of residual stresses.

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RESEARCH ON INFLUENCE OF MAGNETIC TREATMENT ON THE DISTRIBUTION OF WELDING RESIDUAL STRESS OF LOW CARBON STEEL

Journal of Mechanical Engineering ◽

10.3901/jme.2006.05.208 ◽

2006 ◽

Vol 42 (05) ◽

pp. 208 ◽

Cited By ~ 1

Author(s):

Jian LIN

Keyword(s):

Residual Stress ◽

Carbon Steel ◽

Low Carbon Steel ◽

Magnetic Treatment ◽

Welding Residual Stress ◽

Low Carbon

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Development of residual stress and surface cracks in laser treated low carbon steel

Scripta Metallurgica et Materialia ◽

10.1016/0956-716x(91)90224-o ◽

1991 ◽

Vol 25 (4) ◽

pp. 779-784 ◽

Cited By ~ 16

Author(s):

B.A. Van Brussel ◽

H.J. Hegge ◽

J.Th.M. De Hosson ◽

R. Delhez ◽

Th.H. de Keijser ◽

...

Keyword(s):

Residual Stress ◽

Carbon Steel ◽

Low Carbon Steel ◽

Surface Cracks ◽

Low Carbon

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Effects of Cr-Mo Infiltration Source Cathode Different Mixing Proportion on the Thickness of Alloy Layer

Materials Science Forum ◽

10.4028/www.scientific.net/msf.704-705.1006 ◽

2011 ◽

Vol 704-705 ◽

pp. 1006-1010

Author(s):

Jing Chun Zhang ◽

Jin Yong Xu ◽

Yong Yong Deng ◽

Ya Juan Liu ◽

Cheng Gao

Keyword(s):

Carbon Steel ◽

Plasma Nitriding ◽

Low Carbon Steel ◽

Alloy Layer ◽

Work Piece ◽

Composition Analysis ◽

Low Carbon ◽

Technological Parameters ◽

Plasma Surface ◽

Microstructure Observation

Based on the plasma nitriding technique, the double glow plasma surface metallurgy (DG-PSM) technology was developed. This technology is also known as the Xu-Tec Process which utilizes solid metallic elements such as Ni, Cr, Mo, W, Ti, Al, Nb, Zr and their combinations to accomplish plasma surface alloying. Mo-Cr strengthened coating was prepared on the surface of low carbon steel Q235 by this technology. This coating is used to high wear resistant cold die LD steel. By experiment of the three different prescriptions in source cathode, the effect of source cathode composition on the coating has been studied. The technological parameters were as follows: The ratio of Mo and Cr were 2:1, 4:1 and 6:1. The work-piece material is Q235 low carbon steel. Holding time is 4h. Holding temperature 1050°C.Source cathode structure was threadiness. The consequences of composition analysis and microstructure observation results show that, most approaches the purpose of this research is the ratio of Mo and Cr is 6:1, and the alloyed layer has stronger adhesion with substrate.

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