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Kokomo, IN, United States

Haynes International Inc. is a manufacturer of metal alloys employing more than 1,070 employees worldwide with sales of $434.4 million in 2007 with 8 plants around the world. The corporation is headquartered in Kokomo, Indiana. The company specializes in corrosion resistant, and high-temperature alloys for the aerospace, chemical, and gas turbine industries. Wikipedia.

Gamma-prime strengthened Ni-based superalloys comprise a family of critical construction materials for modern gas turbines used in land-based powergeneration applications and aviation applications. Strain-age cracking during postweld heat treatment (PWHT) remains a critical issue in the widespread use of higher-strength members of this alloy family. Previous work (Ref. 1) focused on development of a simple, Gleeble ®-based controlled heating rate test method and specimen configuration that was used to compared the relative strain-age cracking susceptibility of several gamma-prime and gamma-double-prime forming alloys, especially in terms of their composition and total hardening phase precipitation capacity (volume fraction). This study, in contrast, investigated the effects of test temperature, strain rate, and alloy composition on strain-age cracking susceptibility using classic, response-surface DOE methods in temperature/strainrate space, combined with elements of this previously developed experimental method. Observed results were rationalized in terms of known gamma-prime precipitation kinetics.

The hot corrosion behavior of high-temperature alloys is critically important for gas turbine engine components operating near the marine environments. The two test methods—Two-Zone and Burner-Rig—used to evaluate the hot corrosion performance of high-temperature alloys are illustrated by comparing the Type I hot corrosion behavior of selected high-temperature alloys. Although the ranking of the alloys is quite comparable, it is evident that the two-zone hot corrosion test is significantly more aggressive than the burner-rig test. The effect of long-term exposures and the factors that influence the hot corrosion performance of high-temperature alloys are briefly discussed. © 2015 The Minerals, Metals & Materials Society

Water vapor present in an environment is known to limit long-term usage of thin metallic components due to accelerated oxidation attack. This paper is focused on the comparative long-term cyclic oxidation resistance of several high-temperature foil alloys in air plus 10 vol.% water vapor exposed for 360 days at 760 and 871 C. Alloy performance was ranked by assessing weight-change behavior, metal recession measurements, and a special oxidation attack parameter designed to take into account original foil thickness. It was found that the oxidation attack parameter was quite useful in discerning the alloy performances. The types of internal and external oxide scales evolved during oxidation reaction were studied using SEM equipped with EDS and an attempt was made to correlate the alloy performance with type of scale(s) formed during oxidation exposure. © 2012 Springer Science+Business Media New York.

Haynes International | Date: 2014-03-14

NiCrCoMoAl based alloys are disclosed which contain 15 to 20 wt. % chromium, 9.5 to 20 wt. % cobalt, 7.25 to 10 wt. % molybdenum, 2.72 to 3.9 wt. % aluminum, along with typical impurities, a tolerance for up to 10.5 wt. % iron, minor element additions and a balance of nickel. These alloys are readily fabricable, have high creep strength, and excellent oxidation resistance up to as high as 2100 F. (1149 C.). This combination of properties is useful for a variety of gas turbine engine components, including, for example, combustors.

Haynes International | Date: 2013-04-26

A nickel-chromium-molybdenum-copper alloy resistant to 70% sulfuric acid at 93 C. and 50% sodium hydroxide at 121 C. for acid and alkali neutralization in the field of waste management; the alloy contains, in weight percent, 27 to 33 chromium, 4.9 to 7.8 molybdenum, greater than 3.1 but no more than 6.0 copper, up to 3.0 iron, 0.3 to 1.0 manganese, 0.1 to 0.5 aluminum, 0.1 to 0.8 silicon, 0.01 to 0.11 carbon, up to 0.13 nitrogen, up to 0.05 magnesium, up to 0.05 rare earth elements, with a balance of nickel and impurities. Titanium or another MC carbide former can be added to enhance thermal stability of the alloy.

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