Journal ArticleDOI
Control of Laves phase in Inconel 718 GTA welds with current pulsing
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TLDR
In this paper, an attempt was made to control the formation of Laves phase in alloy 718 gas tungsten arc welds using pulsed current, and the results show that the use of current pulsing refines the fusion zone microstructure, reduces the amount of laves phase and exerts a favourable influence on its morphology and improves the response of the fusion zones to post-weld heat treatment and weld tensile properties.Abstract:
The presence of Nb rich Laves phase in Inconel 718 weld fusion zones is known to be detrimental to weld mechanical properties. In the present study, an attempt was made to control the formation of Laves phase in alloy 718 gas tungsten arc welds using pulsed current. Welds were produced in 2 mm thick sheets of the alloy with constant current and pulsed current and were subjected to post-weld solution treatment at 980°C followed by aging. Detailed microstructural studies and tensile tests at 650°C were conducted. The results show that the use of current pulsing (i) refines the fusion zone microstructure, (ii) reduces the amount of Laves phase and exerts a favourable influence on its morphology and (iii) improves the response of the fusion zone to post-weld heat treatment and weld tensile properties.read more
Citations
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Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice
TL;DR: In this article, a unified equation to compute the energy density is proposed to compare works performed with distinct equipment and experimental conditions, covering the major process parameters: power, travel speed, heat source dimension, hatch distance, deposited layer thickness and material grain size.
Journal ArticleDOI
Numerical modeling of microstructure evolution during laser additive manufacturing of a nickel-based superalloy
TL;DR: In this paper, a multi-scale model that combines the finite element method and stochastic analysis is developed to simulate the evolution of the microstructure of an Nb-bearing nickel-based superalloy during laser additive manufacturing solidification.
Journal ArticleDOI
Microstructure and tensile properties of Inconel 718 pulsed Nd-YAG laser welds
TL;DR: Pulsed Nd-YAG laser welding characteristics of Inconel 718 sheet material (2.mm thick) were investigated in this article, where Weld microstructures and room temperature tensile properties were evaluated.
Journal ArticleDOI
Characterization of heat affected zone liquation cracking in laser additive manufacturing of Inconel 718
TL;DR: In this paper, the authors investigated the effect of grain boundary misorientation on susceptibility to liquation cracking in laser additive manufactured Inconel 718, and the results showed that the tendency of liquation film to crack increased with grain boundary angle, which was considered to be attributed to the higher stability of liquid at larger grain boundary during the last stage of solidification.
Journal ArticleDOI
Microstructural Evolution and Mechanical Properties of Inconel 625 Alloy during Pulsed Plasma Arc Deposition Process
TL;DR: In this paper, the microstructures and mechanical properties of Ni-based superalloy Inconel 625 components were investigated by scanning electron microscopy (SEM), optical microscopy, optical microscope, and transmission electron microscope with energy dispersive spectrometer (EDS), microhardness and tensile testers.
References
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Journal ArticleDOI
Progress in joining of advanced materials
Gürel Çam,Mustafa Koçak +1 more
TL;DR: In this article, diffusion bonding and laser welding are considered for joining a wide range of materials of interest in the aerospace industry, as well as in many other industrial applications, and offer remarkable advantages over conventional fusion welding processes.
Journal ArticleDOI
The formation and control of Laves phase in superalloy 718 welds
Ch Radhakrishna,K Prasad Rao +1 more
TL;DR: In this article, the microstructural characteristics and segregational features in alloy 718 welds, with low heat inputs proving beneficial, were found to form in the interdendritic regions of the weld metals as a result of segregation.
Journal ArticleDOI
Microstructure and tensile properties of Inconel 718 pulsed Nd-YAG laser welds
TL;DR: Pulsed Nd-YAG laser welding characteristics of Inconel 718 sheet material (2.mm thick) were investigated in this article, where Weld microstructures and room temperature tensile properties were evaluated.
Journal Article
A review on particulate-reinforced titanium matrix composites
TL;DR: The current status of particulate-reinforced titanium matrix composites is reviewed in this paper, where different types of reinforcements are used, together with the alternative processing routes, and the mechanical properties of these composites are influenced by a wide range of factors.
Journal ArticleDOI
Microstructural refinement of weld fusion zones in α-β titanium alloys using pulsed current welding
TL;DR: In this paper, gas tungsten-arc welds were produced in two α-β titanium alloys under a variety of conditions including direct current (d.c.) pulsing and alternating current (a.c.).