Topic
Spray forming
About: Spray forming is a research topic. Over the lifetime, 1153 publications have been published within this topic receiving 12869 citations. The topic is also known as: spray casting & spray deposition.
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TL;DR: In this article, a spray forming of an iron aluminide [Fe 12.5 Al-2.93 Ni 0.02 B (wt), containing 300 p.p.m. oxygen, followed by heat treatment for 24 h at 500°C, 18 h at 600°C and 20 min at 800°C.
Abstract: High velocity oxyfuel (HVOF) spray forming of an iron aluminide [Fe–12.5 Al–2.93 Ni–0.02 B (wt%), containing 300 p.p.m. oxygen], followed by heat treatment for 24 h at 500°C, 18 h at 600°C and 20 min at 800°C, and multipass hot rolling at 800°C has been studied. Three different thicknesses (0.43, 0.93 and 1.33 mm) of sprayed deposit were produced by spraying for different times (approximately 10, 20 and 30 min). The spray-deposited layers exhibited some oxide and some porosity. This porosity was reduced by heat treatment. The as deposited layer had a high degree of B2 order, and a B2 antiphase domain size of 4.5 nm. On hot rolling this material to a reduction of 38%, it was found to be more susceptible to edge cracking than similar material processed by an ingot–extrusion–hot rolling route. In heat treatment, the aluminide-sprayed layer formed a non-protective Fe2O3 oxide, rather than the usual Al2O3 that forms on the binary alloy. This is attributable to the Ni content of the iron aluminide powder employed. © 1998 Kluwer Academic Publishers
18 citations
TL;DR: In this paper, a novel technique in which TiC particulates are fabricated by an in situ reaction in molten aluminum is introduced for producing TiC/Al-20Si-5Fe composite.
18 citations
Patent•
14 Jan 2015
TL;DR: In this article, a high-hot-strength spray-formed hot work die steel and a preparation method belonging to the technical field of hot-work die steel is presented. And the preparation method comprises the process routes of spray forming, hot forging and heat treatment; different comprehensive mechanical properties are obtained by adjusting the quenching and tempering temperatures in a way of controlling process parameters and hot forging temperature in spray forming process, so that the requirements of different working conditions are met.
Abstract: The invention discloses high-hot-strength spray-formed hot work die steel and a preparation method thereof, belonging to the technical field of hot work die steel. The die steel comprises the following components of 0.3-0.5 of C, 3.0-5.0 of Cr, 1.5-3.5 of Mo, 0.4-1.0 of W, 0.3-0.8 of Si, 0.3-0.5 of Mn, 0.8-1.5 of V, 0.03-0.10 of Nb, less than or equal to 0.03 of S, less than or equal to 0.03 of P and the balance of Fe. The preparation method comprises the process routes of spray forming, hot forging and heat treatment; different comprehensive mechanical properties are obtained by adjusting the quenching and tempering temperatures in a way of controlling process parameters and hot forging temperature in the spray forming process, so that the requirements of different working conditions are met. The compatibility of alloy elements is reasonably optimized according to the characteristic of a spray forming process and the special requirement of the hot work die steel for high-temperature performance, so that the high-hot-strength spray-formed hot work die steel has favorable high-temperature performance, good heat stability and tempering resistance, relatively high impact toughness and excellent comprehensive performance, and the service life of the hot work die steel is greatly prolonged.
17 citations
18 Jun 2012
TL;DR: A number of analytical models predicting the size distribution of particles during atomization of Al-based alloys by N2, He and Ar gases were compared in this article, showing that the finer particles are located near the center of the spray cone.
Abstract: A number of analytical models predicting the size distribution of particles during atomization of Al-based alloys by N2, He and Ar gases were compared. Simulations of liquid break up in a close coupled atomizer revealed that the finer particles are located near the center of the spray cone. Increasing gas injection pressures led to an overall reduction of particle diameters and caused a migration of the larger powder particles towards the outer boundary of the flow. At sufficiently high gas pressures the spray became monodisperse. The models also indicated that there is a minimum achievable mean diameter for any melt/gas system.
17 citations
TL;DR: In this article, the wear behavior of spray formed Al-Si-Pb alloys was investigated using a pin on disk type wear testing machine, wear rate behavior with applied load was observed to depict three stages, in the second stage rate of increase in wear rate was the lowest and in the third stage it was the highest.
Abstract: Wear behavior of spray formed Al-Si-Pb alloys was investigated using a pin on disk type wear testing machine. Wear rate behavior with applied load was observed to depict three stages, in the second stage rate of increase in wear rate was the lowest and in the third stage it was the highest. The wear rate decreased with the increase in distance from center to periphery of the spray deposit. It decreased linearly with the increase in lead content and it was lower for 12% Si as compared to that of 6% Si in Al-Si-Pb alloys. The coefficient of friction decreased rapidly up to the load of 40 N and beyond this load the friction coefficient was almost constant. The coefficient of friction was lower for higher lead content.
17 citations