Results 261 to 270 of about 92,712 (315)
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1981
The development of nickel base alloys over the past 40 years from the simple nickel chromium matrix to the multi-element, multi-phase system of today is discussed under two main headings. The first deals with the metallurgy of the alloys and covers alloying practice, the phases present, strengthening mechanisms and heat treatment.
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The development of nickel base alloys over the past 40 years from the simple nickel chromium matrix to the multi-element, multi-phase system of today is discussed under two main headings. The first deals with the metallurgy of the alloys and covers alloying practice, the phases present, strengthening mechanisms and heat treatment.
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2005
Abstract Forging of nickel-base alloys results in geometries that reduce the amount of machining to obtain final component shapes and involves deformation processing to refine the grain structure of components or mill products. This article discusses the heating practice, die materials, and lubricants used in nickel-base alloys forging ...
D.U. Furrer, S.L. Semiatin
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Abstract Forging of nickel-base alloys results in geometries that reduce the amount of machining to obtain final component shapes and involves deformation processing to refine the grain structure of components or mill products. This article discusses the heating practice, die materials, and lubricants used in nickel-base alloys forging ...
D.U. Furrer, S.L. Semiatin
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Transpassive Dissolution of Nickel-Base Alloys
CORROSION 1993, 1993Abstract Nickel-base (Ni-Cr-Mo) alloy corrosion coupons experience transpassive corrosion thinning at rates as high as 44 mpy (1.12 mm/y) in near-neutral chlorine dioxide pulp bleaching environments. It is believed that the molybdenum in the passive films on these 8-16% Mo-containing alloys is not stable in near-neutral media in the ...
D.A. Wensley, D.C. Reid
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Thermal Stability of Nickel-Base Alloys
Volume 1: Aircraft Engine; Fans and Blowers; Marine, 2016The thermal stability of three Ni-base samples was assessed at 1850F (1010°C) and 2000F (1093°C) in ambient air as a function of exposure time ranging from 500 to 2000 hrs. Assessments of thermal stability of the samples were made using weight change, oxidation, microstructural evolution, and post-exposure mechanical properties such as Vickers ...
D. A. Shifler +5 more
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Hydrogen transport in nickel-base alloys
Metallurgical Transactions A, 1992The electrochemical permeation technique has been used to characterize hydrogen transport and trapping in pure nickel and in alloys 600, X-750, and 718 at a temperature of 80 °C. The “effective diffusivity” of hydrogen atoms in alloy 600 is reduced by a factor of about 5 compared to pure nickel.
A. Turnbull +5 more
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1987
The scope suggested by the title covers a multitude of widely divergent materials and it would be overly ambitious to attempt an exhaustive treatment in a relatively short paper. Instead, in the overall context of the various alloy families involved, a certain number of areas of potential progress are discussed in the lightof experience gained in the ...
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The scope suggested by the title covers a multitude of widely divergent materials and it would be overly ambitious to attempt an exhaustive treatment in a relatively short paper. Instead, in the overall context of the various alloy families involved, a certain number of areas of potential progress are discussed in the lightof experience gained in the ...
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Metal dusting of nickel-base alloys
Materials and Corrosion, 1998Nickel-base alloys are generally less susceptible to metal dusting than steels and the attack is slower. Exposures in strongly carburizing CO-H 2 -H 2 O mixtures at 650 °C and 750 °C have shown, however, gradually increasing attack on the alloys with lower Cr-content.
Klöwer, J. +2 more
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Aging of (nickel-base) alloy N35KT
Metal Science and Heat Treatment of Metals, 19611. The mechanism of decomposition of the solid solution during aging of a prestrained nickel-base alloy N35KT is similar to the mechanism of decomposition of the solid solution and alloys of the Ni-Ti and Ni-Cr-Ti systems. It proceeds in two stages: the first consists in a redistribution of the atoms of Ti, Ni and other elements in the lattice of ...
A. V. Smirnova, N. A. Solov'yeva
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Nickel-Base Alloys for Heat Exchangers
CORROSION 2006, 2006Abstract High temperature heat exchangers require the use of oxidation and creep-resistant alloys. Austenitic stainless steels are often specified for reasons of cost, availability, and ease of fabrication. Water vapor, present in the exhaust gas as a by-product of combustion, has been shown to be detrimental to the elevated temperature ...
J. M. Rakowski, C. P. Stinner
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Thermal Fatigue of a Nickel-Base Alloy
Journal of Basic Engineering, 1965The results of conventional (Coffin-type) thermal-fatigue tests of Hastelloy N are reported. The plastic-strains induced by thermal stresses ranged from a hundred micro-units to more than ten-thousand microunits and correlated well with fatigue life. The slope of the plastic-strain fatigue relationship differs from the conventional slope of minus one ...
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