Journal ArticleDOI
Effect of thermal conditions on microstructural features during spray forming
TLDR
In this article, the evolution of fine-grained microstructure during spray forming is a noteworthy feature and it is achieved by properly designed parameters such as the thermodynamic properties of the gas and the material and the important process variables like superheat temperature, gas pressure, metal flow rate and flight distance.Abstract:
The evolution of fine-grained microstructure, during spray forming is a noteworthy feature and it is achieved by properly designed parameters. These parameters include the thermodynamic properties of the gas and the material and the important process variables like superheat temperature, gas pressure, metal flow rate and flight distance. In the present investigation, fundamental characteristics of droplet dynamics and heat flow pattern have been analysed during the process. It has been indicated that the heat transfer coefficient at the droplet–gas interface is strongly influenced by the size of the droplets and their relative velocity with the gas stream. The droplet dynamics and the thermal state during deposition accordingly govern the microstructure evolution in the deposit. The solidification structure along peripheral to central regions of spray deposits, obtained using a spray atomization and deposition facility available at NPL in conical and flat disc shapes, has been evaluated. On the basis of preliminary observations, the analysis of process parameters during atomization and deposition and their consequences on the scale of microstructure in atomized droplets and spray deposits has been compared and discussed.read more
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Journal ArticleDOI
Microstructural features induced by spray processing and hot extrusion of an Al–18% Si–5% Fe–1.5% Cu alloy
TL;DR: In this paper, an inert gas atomization technique was employed to produce spray deposits of an Al-18Si-5Fe 1.5Cu (wt.%) alloy, and the spray-deposited alloy was subsequently hot extruded with a reduction ratio of 6:1 and extrusion temperature of 480 °C.
Journal ArticleDOI
Heat transfer - A review of 2001 literature
Richard J Goldstein,E. R. G. Eckert,W. E. Ibele,Suhas V. Patankar,Terrence W. Simon,Thomas H. Kuehn,Paul J Strykowski,Kumar K. Tamma,Joachim Heberlein,Jane H. Davidson,John C. Bischof,Francis A Kulacki,Uwe Kortshagen,Sean C. Garrick +13 more
TL;DR: In this paper, contact conduction and contact resistance were investigated. But contact conuction with convection, phase change, and phase change was not one of the main issues in this paper.
Journal ArticleDOI
Microstructure and tensile properties of large-size 7055 aluminum billets fabricated by spray forming rapid solidification technology
Hongchun Yu,Mingpu Wang,Xiaofei Sheng,Zhou Li,Libao Chen,Qian Lei,Chang Chen,Yanglin Jia,Zhu Xiao,Wei Chen,Haigen Wei,Hao Zhang,Xi Fan,Yangguo Wang +13 more
TL;DR: In this article, high-quality large billets of 7055 aluminum alloy were successfully fabricated by spray forming rapid solidification technology, and the results revealed that yield strength, tensile strength and elongation rate of the alloy reached 667MPa, 667 MPa and 10% respectively.
Journal ArticleDOI
Finite element modeling of coating formation and transient heat transfer in the electric arc spray process
TL;DR: In this article, simulation of the coating formation and analysis of the transient heat transfer were performed based on a newly developed finite element model, in which the dynamic stochastic multiple particles deposition characteristic of the process was taken into account.
Journal ArticleDOI
Microstructure and mechanical properties of spray deposited and extruded/heat treated hypoeutectic Al–Si alloy
L.A. Bereta,Cleyton Fernandes Ferrarini,C.S. Kiminami,Walter José Botta,Claudemiro Bolfarini +4 more
TL;DR: In this article, the microstructure and the tensile properties of an Al-8.9 ¼ ¼ Zn alloy processed by spray forming was investigated, where the alloy was gas atomized with argon and deposited onto a copper substrate, extruded at 623 K and heat treated to the T6 temperature Mg was added to some heats.
References
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Book
Fluid flow phenomena in metals processing
TL;DR: Szekely et al. as discussed by the authors presented Fluid Flow Phenomena in Metals Processing, which outlines the fundamentals of fluid flow theory, emphasizing the potential applications of fluidflow concepts that are illustrated by actual problems drawn from the metallurgical literature.
Journal ArticleDOI
Modelling of droplet dynamic and thermal histories during spray forming—I. individual droplet behaviour
TL;DR: In this article, a computer model has been developed to describe the in-flight dynamic and thermal histories of gas atomised droplets as a function of distance during spray forming, and modifications of the model have been used to evaluate the relative importance of different physical assumptions in controlling droplet cooling and solidification behaviour, and ultimately the evolution of spray formed billet microstructures.
Book
Processing and Fabrication of Advanced Materials for High Temperature Applications
V.A. Ravi,T.S. Srivatsan +1 more
TL;DR: In this article, the volume is divided into the following sections: (1) processing and fabrication of intermetallics; (2) intermetallic and metal matrix composites; (3) ceramics and SHS processing; (4) carbon-carbon composites and high temperature coatings; and (5) novel processing routes.
Journal ArticleDOI
Microstructure and mechanical properties of spray-deposited Al-17Si-4.5Cu-0.6Mg wrought alloy
TL;DR: In this paper, an Al-17Si-4.5Cu-0.6Mg (referred to hereafter as AS17) was synthesized using spray deposition to modify the Si phase.
Journal ArticleDOI
Microstructural features and heat flow analysis of atomized and spray-formed Al-Fe-V-Si alloy
TL;DR: In this article, microstructural features of rapidly solidified powders and preforms of Al80Fe10V4Si6 alloy produced by spray forming process have been studied.