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Evaluation of a Ni-20Cr Alloy Processed by Multi-Axis Forging

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Abstract:

This paper discusses the development of a novel processing route to produce ultra finegrain bulk alloy forgings; the microstructural response of these forgings to thermal exposure; and the comparison of mechanical properties to those from conventionally processed material. A Ni- 20Cr [wt%] alloy was processed by near-isothermal multi-axis forging to a grain size of approximately 1 μm. A heat-treatment study over the range 900 to 1200°C was conducted to determine the resultant grain size as a function of time and temperature. Tensile properties were measured at room temperature, 500°C, and 930°C. High-cycle fatigue properties were measured at room temperature. The room-temperature tensile strength was approximately 2.5 times greater than that of conventionally processed Ni-20Cr. Fatigue data showed that the room-temperature highcycle fatigue run-out stress was greater than 100% of the yield stress.

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Periodical:

Materials Science Forum (Volumes 503-504)

Pages:

793-798

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.503-504.793

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Online since:

January 2006

Authors:

R. DiDomizio, M.F.X. Gigliotti, J.S. Marte, P.R. Subramanian, Vener Valitov

Keywords:

Grain Growth, High Cycle Fatigue (HCF), Multi-Axis Forging, Nickel-Chromium

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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