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unsintered particles

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Published: 01 December 2004
Fig. 21 Unsintered iron powder. Surface of part, which had been contacted by the upper punch at 275 MPa (20 tsi). Arrow shows the particle boundaries that will disappear during proper sintering. SEM. 750× More
Image
Published: 01 December 2004
Fig. 28 Fracture surface of a heat treated P/M steel where the fracture occurred in the unsintered state. Top arrow shows the compacted surface. Right arrow points to rounded particle surfaces with no indication of ductile cups and cones that would be typical of a fracture in the sintered More
Image
Published: 01 December 2004
Fig. 29 Same material as Fig. 28 but a fracture surface deliberately created in the sintered and heat treated state. Arrow points to sharp asperities where the particles were torn away from the adjacent material on the opposite fracture surface. Such asperities are not created when a P/M More
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
... green strength hardness lubrication metal powders particle shape particle size Rattler test transverse bend test COMPRESSIBILITY AND COMPACTIBILITY are terms that define the ability to form “green” (unsintered) compact from the die pressing of powders. In general terms, compressibility...
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
..., meant to preserve pore structures and keep them open for analysis. The article compares and contrasts the microstructures of nearly 50 powder metal alloys, using them to illustrate the effect of consolidation and compaction methods as well as particle size, composition, and shape. It discusses imaging...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002126
EISBN: 978-1-62708-188-7
... shaped into a green (unsintered) body, which is then sintered to achieve the necessary densification. In hot pressing, the shaping is performed during sintering. Hot Pressing Hot pressing involves heating the powder in a die, along with the simultaneous application of a high uniaxial pressure...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006074
EISBN: 978-1-62708-175-7
... Molded parts are designated as being in the “green” or unsintered state following common terminology used for die-compacted metal powder parts. The usual next step is sintering to increase density to a maximum value close to theoretical or to a designed lower value for intentionally porous structures...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006109
EISBN: 978-1-62708-175-7
... composition cohesive strength compressibility flow rate frictional properties green strength metal powders particle morphology powder segregation rectangular test bar springback tap density POWDER METALLURGY (PM), metal injection molding, and additive manufacturing have grown considerably...
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
... Abstract This article focuses on the significant fundamental powder characteristics, which include particle size, particle size distribution, particle shape, and powder purity, followed by an overview of general and individual powder production processes such as mechanical, chemical...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002193
EISBN: 978-1-62708-188-7
... and cutting tool parameters as well as some P/M material and production process parameters. These parameters discussed include the particle size, part geometry, porosity, compaction and sintering methods. In addition, the article presents guidelines for the various machining processes, namely, turning...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002486
EISBN: 978-1-62708-194-8
... the powders. Because a die or mold provides the container for the consolidation step, the ease of manufacture of the container and the ability to remove a green compact (unsintered) from the container, in most cases, determines the allowable shape complexity of a given part. Tolerances Control...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001044
EISBN: 978-1-62708-161-0
... to produce green compacts. These are then sintered, or diffusion bonded, at elevated temperatures in a furnace with a protective atmosphere. During sintering, the constituents usually do not melt, and the compacts become substantially strengthened by the development of bonds between individual particles...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006111
EISBN: 978-1-62708-175-7
... longer times. Figure 9 illustrates how microstructure is influenced by sintering time at 1120 °C (2050 °F). Figure 9(a) , a microstructure of an unsintered bar, shows the individual particles, grains within particles, and graphite located primarily at the pores formed between particles. Figure 9(b...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006019
EISBN: 978-1-62708-175-7
... and tests for such properties as particle size, apparent density, tap density, flow rate, compressibility, and green strength. Powder characteristics are directly related to the method used to produce the powder, and properties such as reactivity, shape, and hardness of the powder particles influence...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003065
EISBN: 978-1-62708-200-6
..., are particularly detrimental. Rather than melting, they form discrete defects, which necessitates the scrapping of any glass containing them. The preferred size distribution of sand contains no more than 5 to 10% of particles retained on 40 mesh, and no more than 5 to 10% can pass 140 mesh. Particle size...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003988
EISBN: 978-1-62708-185-6
... particle inspection mechanical properties metallographic analysis nondestructive testing powder characteristics powder forging quality assurance tests tool design POWDER FORGING is a process in which an unsintered, presintered, or sintered powder metal preform is forged in a confined or trapped...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006112
EISBN: 978-1-62708-175-7
... Abstract Powder forging is a process in which unsintered, presintered, and sintered powder metallurgy preforms are hot formed in confined dies. This article provides information on the basic forms of powder forging and describes the material considerations, process considerations...
Series: ASM Handbook
Volume: 23A
Publisher: ASM International
Published: 12 September 2022
DOI: 10.31399/asm.hb.v23A.a0006859
EISBN: 978-1-62708-392-8
... for Cellular Responses to Particles In Vitro” ASTM International F 1904-14 “Standard Practice for Testing the Biological Responses to Particles In Vivo” ASTM International F 1983-14 “Standard Practice for Assessment of Compatibility of Absorbable/Resorbable Biomaterials for Implant Applications...
Series: ASM Handbook
Volume: 23A
Publisher: ASM International
Published: 12 September 2022
DOI: 10.31399/asm.hb.v23A.9781627083928
EISBN: 978-1-62708-392-8
Book Chapter

Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004031
EISBN: 978-1-62708-185-6
... the growth is limited by particle pinning. Also log [ln(1/(1 À X versus log t (or log e) and neutral plane is in compression; the rest of known as secondary recrystallization. are used to determine the so-called Avrami the bend is in tension. See also bending stress. exponent n in the relation X = 1 À exp...