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feedstock microstructure

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Book Chapter

By Justin Heimsch
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005273
EISBN: 978-1-62708-187-0
... Abstract This article provides an overview of the thixocasting process and discusses the concepts that are important to the practical application of this technology. The thixocasting process involves two casting processes. The first casting process is required to make the feedstock that must be...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005275
EISBN: 978-1-62708-187-0
... cost-effective ways. In contrast to many other SSP processes that require a relatively costly precast billet as a starting material, the process uses feedstock granules in particle sizes of 2 to 5 mm (0.08 to 0.2 in.) as chipped from as-cast ingots. The particulate feedstock is conveyed from a...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003112
EISBN: 978-1-62708-199-3
... Scanning electron micrograph of water-atomized iron particles exhibiting a fair degree of irregularity or roughness on the surface (note particle indicated by arrows). 190× Iron powder may also be produced by water atomizing a high-carbon-content feedstock. In one process, a high-carbon...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003120
EISBN: 978-1-62708-199-3
... methods. The article also describes the properties, microstructure, and thermal exposure of superalloys. It further discusses the effects of environmental factors on superalloys, including oxidation and hot corrosion. Protective coatings are also discussed. The article provides information on the...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006465
EISBN: 978-1-62708-190-0
... significantly from the feedstock. The impact on microstructure and bulk material properties must be taken into account and perhaps avoided by altering feedstock powder composition in anticipation of varying final part chemical composition due to volatility variation among alloy constituents. While chemical...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.9781627082907
EISBN: 978-1-62708-290-7
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005266
EISBN: 978-1-62708-187-0
..., with a globular microstructure comprised of solid spheroids suspended in the melted portion to produce the consistency shown. There are three types of SSM processes: thixocasting, rheocasting, and thixomolding. Feedstock for SSM was originally prepared in specially cast billets produced on continuous...
Book Chapter

By P.S. Grant
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005225
EISBN: 978-1-62708-187-0
... carbide distribution (Danspray, Denmark) Spray cast thick steel coatings on dissimilar steel feedstock preforms for reinforcing bar applications (CMC, United States). Preforms are spray cast with up to a 6 mm (0.2 in.) thick outer layer (cladding) of stainless steel at up to 16 tonnes/h (18 tons/h), as...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.9781627081719
EISBN: 978-1-62708-171-9
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003052
EISBN: 978-1-62708-200-6
... and silicon tetrachlorides that are then separated by distillation. The zirconium tetrachloride produced can be used to prepare zirconia directly or as a feedstock for other zirconium chemicals. Calcining with alkali or alkaline earth oxides is also used to decompose zircon. Silica is leached from...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003817
EISBN: 978-1-62708-183-2
... hydrocarbon feedstock at a high temperature. In the regeneration section, the air nozzles suffer erosion from catalyst particles in high-temperature steam, and here, cobalt alloys offer a longer service life than the stainless steels. In thermowells used to protect thermocouples from attack by process streams...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009006
EISBN: 978-1-62708-185-6
... made). Rather, this discussion focuses on testing that can reveal relative degrees of workability from one sampling of feedstock to the next. Of course, pertinent results from these tests can always be correlated with observed processing limitations to allow empirical projections of absolute...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005331
EISBN: 978-1-62708-187-0
... thixocasting (electromagnetically or mechanically stirred direct-chill-cast (DC-cast) billet that is reheated until the eutectic is liquefied) to slurry-on-demand processes that create SSM slugs directly from liquid in the case of rheocasting. The resultant semisolid metal slugs serve as feedstock to either...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003147
EISBN: 978-1-62708-199-3
... alloy series has also found extensive use in high-temperature petrochemical environments, where sulfur-containing feedstocks (naptha and heavy oils) are cracked into component distillate parts. Not only are they resistant to chloride-ion SCC, but they also offer resistance to polythionic acid cracking...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003131
EISBN: 978-1-62708-199-3
... or manganese additions) the alloys are heat treatable for added strength. Depending on the section thickness and cooling rate of the casting, as well as the alloy composition and heat treatments, the microstructures can be rather complex. The aluminum-bronzes can be annealed completely or partially...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005955
EISBN: 978-1-62708-166-5
...). Aerospace titanium specifications are increasingly lowering the parts per million (ppm) hydrogen levels allowed in feedstock. The presence of even minor hydrogen levels in titanium increases embrittlement risks and part failure, which is unacceptable in the aerospace industry. Vacuum annealing furnaces...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005682
EISBN: 978-1-62708-198-6
... power) is focused on the substrate to create a melt pool into which the powder feedstock is delivered via an inert gas flowing through a multinozzle assembly. The powder-feeder system of the LENS system consists of multiple hoppers. By controlling the deposition rates from individual hoppers, it is...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001304
EISBN: 978-1-62708-170-2
... shape The deoxidation practice , such as killed, semikilled, capped, or rimmed steel The microstructure , such as ferritic, pearlitic, and martensitic The required strength level , as specified in ASTM standards The heat treatment , such as annealing, quenching and tempering, and...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005932
EISBN: 978-1-62708-166-5
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005294
EISBN: 978-1-62708-187-0
... also described for compacted graphite irons and high-alloy irons. Fig. 2 Flow chart of cast iron processing with sand molding. (a) Annealing required for malleable irons. Adapted from Ref 2 Feedstock for cast irons includes a mix of pig iron, steel, and scrap iron. Various types of...