scholarly journals Effective role of short time furnace heat treatment and laser treatment on the residual stress and mechanical properties of NiCrBSi–WC weldments produced using plasma transferred arc welding process

2021 ◽  
Vol 15 ◽  
pp. 3492-3513
Author(s):  
K. Deenadayalan ◽  
Vela Murali ◽  
A. Elayaperumal ◽  
S. Arulvel
Author(s):  
T. Tomita ◽  
K. Okita ◽  
Y. Taratani ◽  
Y. Harada

Abstract In order to improve the wear property of high Cr - high Ni overlay alloy coatings with dispersed NbC particles formed by PTA (Plasma Transferred Arc) welding process, the isothermal ageing at 773 ~ 1023K was carried out. The precipitation behavior and the wear property of the NbC-dispersed alloy were examined, compared with the NbC-free alloy, by using vickers hardness tester, SEM, TEM, EDX, XRD and Ohgoshi wear tester. It has been found that the hardness of the NbC-dispersed alloy increased by the isothermal ageing without a solution heat-treatmnet after PTA welding, its age-hardenability is higher than the NbC-free alloy and consequently the wear property is remarkbly improved. This is probably due to a continuous precipitaion of α '- phase. Namely, although, in the NbC-free alloy, both a nodular precipitation of α '-phase and a continuous precipitaion of α '-phase occurred, in the NbC dispersed alloy, any precipitation can't be observed except for the continuous precipitation of α '- phase. It is considered that such different precipitation behaviors have been caused by niobium atoms dissolved in the matrix of the NbC-dipersed alloy.


2011 ◽  
Vol 462-463 ◽  
pp. 593-598 ◽  
Author(s):  
Hong Xia Deng ◽  
Hui Ji Shi ◽  
Seiji Tsuruoka ◽  
Hui Chen Yu ◽  
Bin Zhong

The Plasma transferred arc welding (PTAW) is widely used for hardfacing components exposed to severe conditions. Without post welding heat treatments, large tensile residual stresses remain in the hardfacing coating, which is detrimental. In this paper, a set of post welding heat treatments was evaluated for the heat-resistant steel substrate – Co-based alloy hardfacing coating system. Microstructural and mechanical properties, including the chemical phases of coating surface, the microstructure of coating surface, the Vickers hardness and the residual welding stress, were investigated before and after the heat treatments. Results revealed that during the heat treatments, some elements reprecipitated and the secondary carbide Cr23C6 was formed. After the treatments, a more regular structure and a higher Vickers hardness were obtained. Moreover, the tensile residual stresses in the coating decreased significantly. Therefore, it can be inferred that the post welding heat treatments employed in this paper were proper for this material system.


Author(s):  
Ye Wang ◽  
Mi Zhao ◽  
Hongyu Xu ◽  
Maoliang Hu ◽  
Zesheng Ji

Metal inert gas arc welding process was implemented to join 6063T6 wrought alloy and ADC12 die-casting alloy using ER4047 filler metal. The microstructure of the weld seam and weld interface was investigated. The bonding strength of the butt joints was tested by Charpy U-notch impact test and tensile test. The results showed that a sound welding butt joint with finely silicon particles and excellent mechanical properties was formed, and the size of the silicon particles was nearly 2 μm. Compared with 6063T6 wrought alloy, the impact absorbing energies and the tensile strengths of the butt joint were higher and reached 1.173 kJ/cm2 and 205 MPa, respectively, and the fractures of all tensile specimens occur at the 6063T6 aluminum.


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