Journal ArticleDOI
The formation and control of Laves phase in superalloy 718 welds
Ch Radhakrishna,K Prasad Rao +1 more
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TLDR
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.Abstract:
Weld heat input/cooling rate (affected by welding process, parameters, technique, tooling, etc.) was found to influence the microstructural characteristics and segregational features in alloy 718 welds, with low heat inputs proving beneficial. Laves phase formed in the interdendritic regions of the weld metals as a result of segregation. The morphology and composition of Laves phase depended strongly on heat input/cooling rate and influenced its response to subsequent homogenization post-weld heat treatment. The various factors affecting the formation and control of Laves phase in alloy 718 welds are highlighted.read more
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Effect of heat treatment on the microstructure and mechanical properties of Inconel 718 processed by selective laser melting
TL;DR: The microstructural and mechanical properties of Inconel 718 were determined on the specimens manufactured by selective laser melting (SLM) of prealloyed powder as mentioned in this paper, showing that columnar grains of supersaturated solid solution with internal microsegregation of Nb and Mo, demonstrated by fractions of Laves eutectic or its divorced form in interdendritic regions.
Journal ArticleDOI
Microstructure and hardness studies of Inconel 718 manufactured by selective laser melting before and after solution heat treatment
TL;DR: The microstructure of AM Inconel 718 in general and Selective Laser Melting (SLM) in particular is different from the material produced by conventional methods due to the rapid solidification process associated with the former as mentioned in this paper.
Journal ArticleDOI
Studies of Standard Heat Treatment Effects on Microstructure and Mechanical Properties of Laser Net Shape Manufactured INCONEL 718
TL;DR: In this paper, the laser deposition process is optimized through a set of designed experiments to reduce the porosity to less than 0.03 pct, and failure modes of the tensile specimens were analyzed with fractography.
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
Effect of IN718 Recycled Powder Reuse on Properties of Parts Manufactured by Means of Selective Laser Melting
L.C. Ardila,F. Garciandia,J. B. González-Díaz,P. Alvarez,A. Echeverria,M.M. Petite,R. Deffley,J. Ochoa +7 more
TL;DR: In this article, the effect of powder reuse on its quality and on the mechanical properties of the resulting melted parts is studied via self-developed recycling methodology, and the results obtained in this work will help to validate powder recycling methodology for its use in current industrial Selective laser melting manufacturing.
References
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Journal ArticleDOI
A Model for the Formation and Solidification of Grain Boundary Liquid in the Heat-Affected Zone (HAZ) of Welds
B. Radhakrishnan,R. G. Thompson +1 more
TL;DR: In this article, a model for the formation of grain boundary liquid during the heating cycle and its solidifiction during the cooling cycle is presented to predict liquation cracking susceptibility of an alloy under a given welding condition, both the microstructural evolution which centers around grain boundary liquation and the stress generation have been modeled.
Journal ArticleDOI
Heat affected zone cracking in cast inconel 718
TL;DR: In this paper, it was shown that travel speed was the most significant factor in influencing heat-affected zone cracking behavior by modifying the thermal gradient(s) and subsequently the stress state in the HAZ.
Journal ArticleDOI
Studies on creep/stress rupture behaviour of superalloy 718 weldments used in gas turbine applications
Ch. Radhakrishna,K. Prasad Rao +1 more
TL;DR: In this paper, a superalloy 718 in the solution-treated condition was welded autogenously by electron beam welding and gas tungsten are welding processes and the weldments after suitable heat treatment were subjected to creep/stress rupture testing at 650°C and 690 MPa.