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• W2321285877 abstract "A unique advantage of P/M processing is in producing near-net shape or even final shape products. This survey of a channel extrusion produced directly from a consolidated billet of P/M 718 reveals that excellent mechanical properties and uniform grain size are obtained. Tensile properties at ambient and at 650°C and stress rupture at 650°C exceed the internal specification for a rolled profile as well as the AMS specifications for cast and wrought 718. From a property and cost standpoint, the P/M near-net shape is superior to the rolled profile from conventional cast-wrought operations. Also, properties are compared with other special products of P/M 718 that were studied previously, and an SEM analysis of a stringer aggregate in the P/M 718 extrusion is provided. * At the time of this investigation, Supervisory Research Metallurgist, Universal-Cyclops Specialty Steel division (now Cytemp Powder Products Division), Bridgeville, PA. Superalloys 718,625 and Various Derivatives Edited by Edward A. Lmia The Minerals, Metals & Materials Society, 1991 905 Introduction The advantages cited for the use of powder metallurgy include the ability to make complex alloys not possible with conventional techniques, freedom from segregation, finer grain size, superplastic forming and hot consolidation processes to produce near-net shapes. Developed initially for advanced materials that could only be made this way, the technology can be applied equally well to high volume superalloys. The structure and properties of P/M Alloy 718 have been shown to be at least comparable and in some instances superior to the conventionally produced wrought counterpart. * Although the replacement has been slow because of the extensive experience built up for the latter, the P/M approach is being explored for specific products. Heavy wall tubing has been produced from P/M 718 tube hollows via successive cold reductions on a Pilger mill and lighter wall tubing has been produced by radial cold forging of P/M 718 tube hollows in a Grotnes machine.2 Even cross rolled plate has been examined from solid P/M 718 billet. Also, P/M 625 billet has been extruded and then hot and cold rolled to coil product for redraw-stock welding wire. 3 In all cases, the powders were consolidated by atmospheric pressure in glass molds, the CAP process.1 To add to these exploratory studies, this paper provides results obtained on an L-shaped channel produced by extrusion of P/M 718 which could be a replacement of a rolled profile that is fabricated into an aircraft turbine component. Figure 1. End views and flow line contours produced during extrusion of P/M 718 billet into an L-shaped channel. ExDerimental Procedure The extruded shape was produced from a 5 in. round by 30 in. long P/M CAP718 billet derived from a heat whose principal composition was 53.2Ni, 18.3Cr, 18.6Fe, 5.4Nb, 3.0M0, 0.94Ti and 0.55Al in wt.pct. The remaining residual elements were O.lOMn, O.llSi, O.O05P, 0.002s and 0.058C. The L-shaped channel was extruded at 1100°C by a proprietary process employing optimum extrusion flow stress for P/M 718 derived from the billet section, the optimum extrusion ratio and the alloy’s high temperature flow stress. The dimensions of the extruded profile were 2 l/8 in. height with 13/16 in. thickness and 1 3/4 in. base with 5/B in. thickness, 906 per Figure 1. The macrostructure appeared uniform both visually and under binoculars. Metal flow lines in various parts of the extrusion are seen in Figure 1 and the clean contours are important aspects of the successful processing of this very stiff alloy. Longitudinal specimens were cut from the base and vertical of the extruded channel and subjected to metallography, tensile and stress rupture testing after the specified heat treatments. Results The grain size of the extruded channel was uniform ASTM7 as seen in the longitudinal views of Figure 2. The presence of stringers, dispersed throughout the microstructure, would not be of any concern to mechanical properties which Figure 2. Microstructure in longitudinal direction of P/M Alloy 718 extruded shape. (a) XLOO. (b) X200. . would only be requisite in the longitudinal direction for the component fabricated from the channel. Room temperature tensile test results for the two specific heat treatments listed in Table I exceed the specification for rolled profiles from castwrought practice. The 995OC or 990°C solution treatments provided higher values than as extruded or as extruded plus direct aged product. It is somewhat surprising that the latter did not maximize tensile strength which is the usual case. Also, the values obtained for the two solution treatments exceed the specified 185 ksi ultimate, 150 ksi yield, 12 pet elongation and 15 pet reduction of area in AMS5662B and 5663B for bars, forgings and rings and AMS5589 for seamless tubing produced by conventional CW processing. The tensile test results at 65O”C, per Table II, reveal that either heat treatment on the extruded channel provided values that exceed the internal specification established for a rolled profile. Again, the results are well above the requirements of the above AMS specs for other CW products which are 145 ksi ultimate, 125 ksi yield with 12 pet elongation and 15 pet reduction of area. Finally, the stress rupture results at 650°C under a stress of 100 ksi, listed in Table III, exceed the requirements of the internal specification as well as the above AMS spec requirements of 23 hours and 4 pet elongation for a stress of 100 ksi at 650°C." @default.
• W2321285877 created "2016-06-24" @default.
• W2321285877 creator A5021144674 @default.
• W2321285877 date "1991-01-01" @default.
• W2321285877 modified "2023-10-03" @default.
• W2321285877 title "Evaluation of an L-Shaped Extrusion of P/M Alloy 718" @default.
• W2321285877 doi "https://doi.org/10.7449/1991/superalloys_1991_905_912" @default.
• W2321285877 hasPublicationYear "1991" @default.
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