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Research Papers: Gas Turbines: Structures and Dynamics

HAYNES NS-163 Alloy: A Novel Nitride Dispersion-Strengthened CO-Base Alloy

[+] Author and Article Information
Michael G. Fahrmann

Research and Technology Department,
Haynes International, Inc.,
1020 West Park Avenue,
Kokomo, IN 46904-9013
e-mail: mfahrmann@haynesintl.com

Vinay P. Deodeshmukh

Research and Technology Department,
Haynes International, Inc.,
1020 West Park Avenue,
Kokomo, IN 46904-9013
e-mail: vdeodeshmukh@haynesintl.com

S. Krishna Srivastava

Research and Technology Department,
Haynes International, Inc.,
1020 West Park Avenue,
Kokomo, IN 46904-9013
e-mail: ksrivastava@haynesintl.com

1Corresponding author.

2HAYNES, 230, and NS-163 are registered trademarks of Haynes International, Inc.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 18, 2014; final manuscript received December 13, 2016; published online February 28, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(7), 072505 (Feb 28, 2017) (7 pages) Paper No: GTP-14-1412; doi: 10.1115/1.4035625 History: Received July 18, 2014; Revised December 13, 2016

HAYNES® NS-163® alloy was developed by Haynes International Inc., Kokomo, IN, for high-temperature structural applications by pursuing a dual manufacturing approach: the fabrication of components in the readily weldable and formable mill-annealed condition, and their subsequent strengthening by means of a gas nitriding process.ff2 The latter process results in dispersion-strengthening by virtue of formation of internal nitrides. Since this process is diffusion-controlled, component section thicknesses are limited to approximately 2.0 mm (0.080 in.). Microstructures and mechanical properties of nitrided sheet samples are presented. Oxidation resistance and the need for coatings at temperatures exceeding 980 °C (1800 °F) are addressed as well.

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Figures

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Fig. 2

Typical microstructure of the un-nitrided (as bright-annealed) NS-163 feedstock

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Fig. 3

Typical microstructure of nitrided NS-163 alloy

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Fig. 1

Nitrogen uptake of 0.5 mm (0.020 in.) thick sheet samples as a function of nitridation time at 2100 °F (1149 °C)/100 Torr N2

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Fig. 4

Room temperature tensile yield strength of NS-163 alloy as a function of nitrogen uptake. All sheet thicknesses.

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Fig. 5

Elevated 982 °C (1800 °F) temperature tensile yield strength of NS-163 alloy as a function of nitrogen uptake. All sheet thicknesses.

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Fig. 6

Plot of various measures of attack due to static oxidation at 871 °C (1600 °F) for 1008 h

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Fig. 7

Plot of various measures of attack due to static oxidation at 982 °C (1800 °F) for 1008 h

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Fig. 8

Plot of various measures of attack due to static oxidation at 1093 °C (2000 °F) for 1008 h

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Fig. 9

Cross section of the uncoated NS-163 alloy sample cycled every 10 h at 1063 °C (2000 °F) for 1000 h total

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Fig. 10

Cross section of the coated NI 343/NS-163 alloy sample cycled every 10 h at 1063 °C (2000 °F) for 1000 h total. The top surface was uncoated.

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Fig. 11

Larson–Miller plot of 1% creep lives of NS-163 alloy, 230 alloy, and ODS alloy MA 956 [8]

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