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spherical prealloyed powder

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Published: 30 September 2015
Fig. 4 Spherical powder particles. (a) Prealloyed Ti-6Al-4V produced by gas atomization (GA). (b) Plasma rotating electrode powder (PREP) processing More
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006094
EISBN: 978-1-62708-175-7
... prime. This article provides a discussion on the conventional processing, compositions, characteristics, mechanical properties, and applications of powder metallurgy (PM) superalloys. The conventional processing of PM superalloys involves production of spherical prealloyed powder, screening...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006095
EISBN: 978-1-62708-175-7
...) and (f) The powder in (d) milled down to –100 mesh, uniform size TiH 2 powder for master alloy blending, cold isostatic pressing (CIP), and vacuum sintering into titanium powder billets Prealloyed PM This category of powder-based titanium was originally based on hot consolidation of spherical...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003135
EISBN: 978-1-62708-199-3
..., pressure, and flow rate. Gas atomization produces spherical particles while the shape of water-atomized powder particles can be controlled from almost spherical to irregular by controlling the interaction between the water jet and the metal stream ( Fig. 1 ). Higher pressures and lower flow rates favor...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006081
EISBN: 978-1-62708-175-7
... and low-alloy steels are classified into three general types depending on the alloying process ( Fig. 2 ). Prealloyed powders are produced by melting and subsequent atomization, so powder particles are of similar alloy composition. In contrast, admixed powders are alloyed during sintering, which requires...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006139
EISBN: 978-1-62708-175-7
..., the phosphorus oxidizes preferentially and forms protective gaseous phosphorus pentoxide (P 2 O 5 ). Table 1 lists the properties of typical commercial atomized copper powders. The specific surface areas of these powders are from 0.02 m 2 /g for coarse, spherical, gas-atomized powder to 0.2 m 2 /g for fine...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001070
EISBN: 978-1-62708-162-7
... powder characteristics of commercial copper powders made by various production processes. These powders are used in all major P/M copper-base products mentioned above except for brass and nickel silver structural parts, which are made exclusively from atomized prealloyed powders. Characteristics...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006032
EISBN: 978-1-62708-175-7
... in the compressibility of prealloyed steel powders, while significantly higher compaction pressures are required for chromium, copper, and manganese. The reduction in compressibility from chromium and manganese is attributed not only to solid-solution strengthening, but also to the strong oxidation tendency of chromium...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006084
EISBN: 978-1-62708-175-7
... Abstract Atomization is the dominant method for producing metal and prealloyed powders from aluminum, brass, iron, low-alloy steels, stainless steels, tool steels, superalloys, titanium alloys, and other alloys. The general types of atomization processes encompass a number of industrial...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003112
EISBN: 978-1-62708-199-3
... and tool steels) and will not be described further here. Both iron-carbon and some prealloyed powders are produced by water atomization. They are used for higher-stress, higher-performance applications. For the production of iron powder by water atomization of low-carbon iron, molten carbon steel...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003789
EISBN: 978-1-62708-177-1
... reactivity). Gas-atomized powders, on the other hand, generally are more spherical or rounded in shape and, if atomized by an inert gas, generally have lower oxygen (oxide) contents. There are, of course, exceptions in each type. For high-volume, low-cost production, water atomization generally is preferred...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003113
EISBN: 978-1-62708-199-3
... the mechanical property data for copper and graphite powders mixed with an iron powder base to produce materials that generally contain 2″ Cu, including tensile, impact, and fatigue properties. Heat treatment procedures used in developing the properties of the prealloyed powder forged materials are also covered...
Book Chapter

By Erhard Klar
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003185
EISBN: 978-1-62708-199-3
... compact prior to sintering. Spherically shaped powders have the lowest green strength characteristics and for that reason are generally not usable for room temperature die compaction. Conversely, such powders are often preferred in other P/M processes (i.e., hot isostatic pressing, powder extrusion...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006140
EISBN: 978-1-62708-175-7
... powder metallurgy process modeling titanium components THE PREALLOYED (PA) powder metallurgy (PM) approach involves use of prealloyed powder, generally spherical in shape, which has been produced by melting. Either a technique such as the plasma rotating electrode processing (PREP) or gas...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001083
EISBN: 978-1-62708-162-7
... Abstract This article focuses on the mechanical properties, production of titanium powder metallurgy (P/M) compacts, namely, blended elemental (BE) compacts and prealloyed (PA) compacts. It explains the postcompaction treatments of titanium P/M compacts, including heat treatment...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006134
EISBN: 978-1-62708-175-7
... mechanical strength ( Ref 9 ). Bearings can be produced from preblended elemental powder mixes or prealloyed powders. These 89/11 or 90/10 bronze powders can be produced by any of three main processes. Gas or air atomization of prealloyed bronze yields fine, spherical particles that can be processed to low...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003119
EISBN: 978-1-62708-199-3
... and sintering prealloyed stainless powders. High-density materials are produced by hot isostatic pressing, cold isostatic pressing followed by extrusion, or metal injection molding. The comparison of mechanical properties of these P/M stainless steels is represented graphically. The article contains a table...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006088
EISBN: 978-1-62708-175-7
... systems in PM. Important three- and four-component systems include iron-carbon-lubricant, copper-tin-lubricant, iron-copper-carbon-lubricant, and copper-tin-carbon-lubricant. The widespread use of powder mixtures, rather than prealloyed powders, is attributable to both economic and technical factors...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006122
EISBN: 978-1-62708-175-7
... Total 34,000 Types of Carbonyl Nickel Powders Two distinct types of carbonyl nickel powders are commercially available: (1) a discrete spherical-like particle with a spiky morphology and average particle size (laser methodology) of 8 to 10 microns ( Fig. 2 ) and (2) a filamentary three...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006042
EISBN: 978-1-62708-175-7
.... The article describes the available process routes for fabricating products using HIP and the steps involved in the production of a part via direct HIP of encapsulated gas-atomized spherical powder. It concludes with information on the microstructures of 316L stainless steel HIP powder metallurgy valve body...