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eutectic modification

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140039
EISBN: 978-1-62708-335-5
...; dendrite arm spacing; grain size and shape; and eutectic modification and primary phase refinement. This chapter discusses the effects of these microstructural features on properties and methods for controlling them. The chapter concludes with a detailed examination of the refinement of hypereutectic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2016
DOI: 10.31399/asm.tb.ascaam.t59190001
EISBN: 978-1-62708-296-9
... castings and its effect on properties and processing characteristics. It discusses the faceted nature of primary Si crystals and the modification techniques used to optimize their shape. It also describes the morphology of the (alpha-Al + Si) eutectic, which can be lamellar or rodlike in shape...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2016
DOI: 10.31399/asm.tb.ascaam.t59190089
EISBN: 978-1-62708-296-9
..., before and after modification. The chapter also provides composition data and includes callouts identifying various phase constituents in the interdendritic eutectic microstructure. cast aluminum-silicon alloys microstructure phase constituents MICROSTRUCTURE IMAGES represent...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140007
EISBN: 978-1-62708-335-5
... low strength and poor machinability. Ductility, which can be exceptional, is a function of low impurity concentrations and microstructural features. The strength, ductility, and castability of hypoeutectic aluminum-silicon alloys can be further improved by modification of the aluminum-silicon eutectic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170351
EISBN: 978-1-62708-297-6
... and 319 Fig. 24 As-cast Al-7Si ingots showing the effects of grain refinement. (a) No grain refiner. (b) Grain-refined. Both etched using Poulton’s etch; both 2x Hypoeutectic aluminum-silicon alloys can be improved by inducing structural modification of the normally occurring eutectic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2016
DOI: 10.31399/asm.tb.ascaam.t59190vii
EISBN: 978-1-62708-296-9
... technical conditions). B Refinement of the primary microstructure Nb Refinement of the primary microstructure P Morphology modification and refinement of the primary Si crystals Sr Morphology modification of the eutectic Si crystals Ti Refinement of the primary microstructure V...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060085
EISBN: 978-1-62708-261-7
... are made in a variety of ways, so that the resulting part will possess the correct shape and dimensions required for the finished form. Many foundry alloys have compositions that are based on eutectic compositions (see Chapter 2, “Structure of Metals and Alloys,” in this book) that possess a lower...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2016
DOI: 10.31399/asm.tb.ascaam.9781627082969
EISBN: 978-1-62708-296-9
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170107
EISBN: 978-1-62708-297-6
... Abstract This article discusses the production, properties, and uses of high-alloy white irons. It explains how the composition and melt are controlled to produce a large volume of eutectic carbides, making these irons particularly hard and resistant to wear, and how the metallic matrix...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240487
EISBN: 978-1-62708-251-8
... is extremely important in the production and processing of aluminum alloys. Important microstructural features include constituent particles and dispersoids. Constituent particles are coarse intermetallic compounds that form by eutectic decomposition during ingot solidification. Some are soluble, while others...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560005
EISBN: 978-1-62708-291-4
... prepared. Other adjectival modifications have been used in attempts to convey such information as the influence of thermal treatment (carbon-enriched austenite, homogenized austenite , and stabilized austenite) , the origin of the phase ( primary austenite, precipitated austenite , and eutectic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420087
EISBN: 978-1-62708-310-2
... Abstract This chapter begins by presenting a generic eutectic phase diagram and identifying critical points, lines, and features. It then describes the composition and properties of aluminum-silicon and lead-tin eutectic systems, the characteristics of eutectic morphologies, the solidification...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240075
EISBN: 978-1-62708-251-8
... to modify the eutectic structure, producing more rounded particles. If the alloy is rapidly cooled, such as in a die casting, modification is not necessary since rapid cooling produces a fine structure. In hypereutectic alloys that are used for engine blocks because of their high-silicon contents and thus...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140061
EISBN: 978-1-62708-335-5
.... Metallurgical considerations such as chemical segregation, phase size and distribution, grain and dendrite cell sizes, and the modification or degree of refinement of eutectic and hypereutectic structures alter properties. For heat treated and aged tempers, variables include solution time and temperature...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280025
EISBN: 978-1-62708-267-9
...). Initial microstructures of all superalloys contained some amount of carbide, dependent on the carbon content of the material, with cobalt alloys showing substantial amounts of carbide phases. However, except for modifications in the amount of carbides, cobalt alloy microstructures have not evolved much...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240453
EISBN: 978-1-62708-251-8
... cast iron malleable cast iron compacted graphite cast iron IRON-CARBON ALLOYS with a carbon content of less than 2 wt% are normally classified as steels, while alloys with greater than 2 wt% C are classified as cast irons. The carbon content of the eutectic in the Fe-Fe 3 C system is 4.3 wt...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170003
EISBN: 978-1-62708-297-6
... changing the chemical composition of the surface of a part by such processes as plating, cladding, nitriding, ion implantation, carburizing, and hot dip galvanizing, this book is limited to only those alloying processes that affect the bulk of the material, while surface modification is discussed in other...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140021
EISBN: 978-1-62708-335-5
... as approximately 0.25%. These efforts focus on process refinements, design modifications, and improved die lubrication. At higher iron concentrations, there is a risk of exceeding solubility limits of coarse Al-Fe-Cr-Mn segregate at molten metal temperatures. Sludging or precipitation of segregate is prevented...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220583
EISBN: 978-1-62708-259-4
... compacted graphite iron ductile cast iron gray cast iron malleable cast iron microstructure mottled cast iron white cast iron Cast irons are iron-based alloys with chemical compositions close to that of the eutectic point in the iron-carbon phase diagram (see Fig. 17.1 ). The classical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410029
EISBN: 978-1-62708-280-8
... ratios, unlike forging), it is essential to ensure that the cast material preform has high integrity. The crack propagation slows down if the product does not contain oxides, is of acceptable grain size (less than 500 μm), has a good modification rating, and has an acceptable refined structure (DAS...