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Wide gap brazing of inconel 738lc nickel-based superalloy: metallurgical and mechanical characteristics
, Article Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science ; Volume 51, Issue 12 , 2020 , Pages 6283-6293 ; Farzadi, A ; Marashi, P ; Pouranvari, M ; Sharif University of Technology
Springer
2020
Abstract
This paper addresses the microstructure properties relationship of wide gap brazed Inconel 738LC. Amdry 718 and a Ni-Cr-Fe-Si-B alloy were used as high melting particles (HMPs) and low melting particles (LMPs), respectively. The effect of the amount of LMPs, 30, 40, and 50 pct, on the microstructure and the shear strength of the joint, was investigated. The microstructure in the brazing zone consists of Ni-based solid solution and eutectic-type microconstituents that is nickel-rich and chromium-rich borides. Nickel-rich borides only observed in the presence of the high amount of LMPs, because of the low Cr-B ratio in the filler alloy. At the brazing/base metal interface, high diffusion of...
Theoretical and experimental study of microstructures and weld pool geometry during GTAW of 304 stainless steel
, Article International Journal of Advanced Manufacturing Technology ; Volume 42, Issue 11-12 , 2009 , Pages 1043-1051 ; 02683768 (ISSN) ; Farzadi, A ; Serajzadeh, S ; Kokabi, A. H ; Sharif University of Technology
2009
Abstract
In this work, temperature field and weld pool geometry during gas tungsten arc welding of 304 stainless steel are predicted by solving the governing equations of heat transfer and fluid flow under quasi-steady state conditions. The model is based on numerical solution of the equations of conservation of mass, momentum, and energy in the weld pool. Weld pool geometry, weld thermal cycles, and various solidification parameters are then calculated by means of the model predictions. The model considers the effects of various process parameters including welding speed and heat input. It is found that the weld pool geometry, predicted by the proposed model, is in reasonable agreement with the...