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cast cobalt alloys

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240563
EISBN: 978-1-62708-251-8
... Abstract Superalloys are nickel, iron-nickel, and cobalt-base alloys designed for high-temperature applications, generally above 540 deg C. This chapter covers the metallurgy, composition, and properties of cast and wrought superalloys. It provides information on melting, heat treating...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000009
EISBN: 978-1-62708-313-3
... Cobalt-base alloys are used for applications where hot corrosion is a major concern or for low-stress structural applications at moderate-to-high temperatures. Cast alloys are typified by X-40 and MAR-M 302, while Haynes 25 (L-605), Haynes 188, and S-816 are representative of wrought alloys. (Haynes 25...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170540
EISBN: 978-1-62708-297-6
... vanes and buckets. The harder grades are used for resistance to wear. Compositions of various cobalt-base alloys Table 3 Compositions of various cobalt-base alloys Alloy tradename UNS No. Nominal composition, wt% Co Cr W Mo C Fe Ni Si Mn Others Cast, P/M, and weld overlay...
Image
Published: 01 March 2002
Fig. 3.4 Typical operating microstructures of representative superalloys. (a) Cast cobalt-base alloy. 250×. (b) Cast nickel-base alloy. 100×. (c) Wrought (left, 3300×) and cast (right, 5000×) nickel-base alloys. (d) Two wrought iron-nickel-base alloys (left, 17,000×); IN-718 (right, 3300 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170614
EISBN: 978-1-62708-297-6
... such large amounts of cobalt make it possible to develop a preferred orientation by heat treating the material in a magnetic field. Less striking improvements in H c and B r are obtained in nonoriented samples. Compositions and properties of both cast and P/M Alnico alloys are listed in Tables 4...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280079
EISBN: 978-1-62708-267-9
... patterns, molds, and shells are produced, discusses the practice of directional solidification, and examines an assortment of turbine components cast from nickel- and cobalt-base alloys. The chapter also addresses casting problems such as inclusions, porosity, distortion, core shift, and leaching...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060315
EISBN: 978-1-62708-261-7
... are not strengthened by coherent, ordered precipitates. Rather, they are characterized by a solid-solution-strengthened austenitic (fcc) matrix in which a small quantity of carbide is distributed. Cast cobalt alloys rely on carbide strengthening to a much greater extent. Cobalt-base alloys are often designed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280211
EISBN: 978-1-62708-267-9
...-base alloys, although detrimental effects of carbide films have been reported. Cobalt-Base Alloys Studies of specific effects of grain-boundary carbides in cobalt-base alloys are even more sparse. The carbide distribution in cobalt-base alloys arises from the original casting or upon cooling...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280025
EISBN: 978-1-62708-267-9
... discussion of investment casting in Chapter 5 ). Wrought powder metallurgy alloys of the ODS class and cast alloys such as MAR-M-247 have demonstrated property improvements, owing to control of grain morphology by directional recrystallization or directional solidification. Cobalt-Base Superalloys...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170234
EISBN: 978-1-62708-297-6
... Standard grades 18Ni(200) 18 3.3 8.5 0.2 0.1 … 18Ni(250) 18 5.0 8.5 0.4 0.1 … Low-cobalt 18Ni(250) 18.5 2.6 2.0 1.2 0.1 0.1 18Ni(300) 18 5.0 9.0 0.7 0.1 … 18Ni(350) 18 4.2 (b) 12.5 1.6 0.1 … 18Ni(Cast) 17 4.6 10.0 0.3 0.1 … 12-5-3(180) (c) 12 3...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240547
EISBN: 978-1-62708-251-8
..., and, in the case of the cast and hardfacing materials, by chemical segregation in the microstructure. As a result of their homogeneous microstructures and lower carbon contents, the wrought cobalt-base high-temperature alloys, which typically contain tungsten rather than molybdenum, are even more resistant...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170290
EISBN: 978-1-62708-297-6
... with consecutive positions in the periodic table of elements. The iron-nickel-base superalloys are an extension of stainless steel technology and generally are wrought, whereas cobalt- and nickel-base superalloys may be wrought or cast, depending on the application/composition involved. The more highly alloyed...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280189
EISBN: 978-1-62708-267-9
..., but nevertheless they are more apt to react with iron-nickel- and cobalt-base workpieces. Consequently, SiAlON and SiC whisker-reinforced Al 2 O 3 are most effective when cutting wrought nickel-base alloys. The cast nickel-base alloys, because of their grain structure, chip even the tougher ceramics. Coated...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280011
EISBN: 978-1-62708-267-9
... alloys are called out in design. Because of a melting-point advantage, the PC cast cobalt-base superalloys are usually stronger than the nickel-base superalloys at temperatures above 2000 °F (1093 °C). This is not an absolute fact, because SCDS cast nickel-base alloys are capable of operation above...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060273
EISBN: 978-1-62708-355-3
... 40 Copper casting alloys( a ) 965 140 62 9 Stainless steels, standard austenitic grades; wrought, cold worked 965 140 517 75 Niobium and its alloys 931 135 241 35 Iron-base superalloys; cast, wrought 924 134 276 40 Cobalt-base superalloys, wrought 800 116 241 35...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280001
EISBN: 978-1-62708-267-9
... of the alloy but also to melting procedures, forging and working processes, casting techniques, and, above all, to heat treatment following forming, forging or casting. Iron-nickel-base (sometimes designated nickel-iron-base) superalloys such as IN-718 are less expensive than nickel-base or cobalt-base...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.9781627082679
EISBN: 978-1-62708-267-9
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000001
EISBN: 978-1-62708-313-3
...-Cr-W systems developed for environmentally aggressive applications, such as cutlery, machine tools, and wear-resistant surfaces ( Ref 5 ). By the time the United States had developed its first aircraft GTE in 1943, cobalt-base superalloys had been introduced, and Haynes Stellite 21 (a cast alloy...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000059
EISBN: 978-1-62708-313-3
... Abstract This chapter discusses the typical compositional ranges of superalloys, the role of major base metals (iron, cobalt, and nickel), and the effects of common alloying additions. It describes how chromium, aluminum, and titanium as well as refractory elements, grain-boundary elements...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280339
EISBN: 978-1-62708-267-9
... as wrought materials, new cobalt-base superalloys were invented and brought to market, while both wrought and cast nickel-base superalloys became the predominant alloys of choice for the most strength-critical applications. The development of vacuum melting technology for superalloys provided for a quantum...