Tensile properties and fracture mechanism of IN-100 superalloy in high temperature range

  • Milan T. Jovanović Department of Materials Science, Institute of Nuclear Sciences "Vinča", University of Belgrade
  • Đorđe Drobnjak Faculty of Technology and Metallurgy, University of Belgrade
  • Ivana Cvijović‐Alagić Department of Materials Science, Institute of Nuclear Sciences "Vinča", University of Belgrade
  • Vesna Maksimović Department of Materials Science, Institute of Nuclear Sciences "Vinča", University of Belgrade
Keywords: Tensile strength, elongation, microstructure, microvoids, intergranular crystallographic fracture

Abstract

Tensile properties and fracture mechanism of a polycrystalline IN-100 superalloy have been investigated in the range from room temperature to 900°C. Optical microscopy (OM) and transmission electron microscopy (TEM) applying replica technique were used for microstructural investigation, whereas scanning electron microscopy (SEM) was utilized for fracture study. High temperature tensile tests were carried out in vacuumed chamber. Results show that strength increases up to 700°C, and then sharply decreases with further increase in temperature. Elongation increases very slowly (6-7.5%) till 500°C, then decreases to 4.5% at 900°C. Change in elongation may be ascribed to a change of fracture mechanism. Appearance of a great number of microvoids prevails up to 500°C resulting in a slow increase of elongation, whereas above this temperature elongation decrease is correlated with intergranular crystallographic fracture and fracture of carbides.

References

G. Bi, C.N. Sun, H.C. Chan, F.L. Ng, C.C. Ma, Mater. Design 60 (2014) 401-408.

A. Jafari, S. M. Abbasi, A. Rahimi, M. Morakabati, M. Seifollahi, Metall. Mater. Eng. 21 (2015) 167-181. LINK

R. Acharya, S. Das, Metall. Mat. Trans. A 46 (2015) 3864-3875.

A.M. Wusatowska-Sarneka. G.B. Olson, M.J. Blackburn, M. Aindow, J. Mater. Res. 7 (2003) 2653-2663.

W.W. Milligan, E.L. Orth, J.J. Schirra, M.F. Savage, Superalloys 2004, Eds. K.A. Green et al., TMS (The Minerals, Metals & Materials Society), Warrendale, Pennsylvania, 2004.

Metals Handbook, 9th Edition, Volume 9, Metallography and Microstructures, Eds. K. Mills et al., ASM (American Society for Metals), Metals Park, Ohio, 1985.

M.T. Jovanović, Metall. Mater. Eng. 22 (2016) 205-220.

J.L. Smialek, Exploratory Study of Oxidation-Resistant Aluminized Slurry Coatings for IN 100 and WI-52 Superalloys, Retrieved April 10, 2017, from https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19710015970.pdf

M. Cavacece, P. P. Valentini, L. Vita, Int. J Comput. Appl. T. 28 (2007) 275-280.

N. Ejaz,, I.N. Qureshi,S.A. Rizvi, Eng. Failure Anal. 18 (2011) 1407-1414.

X. Huang, Z. Zhang, Z. Liu, H. Zhuangqi, Metall. Mat. Trans. A 28 (1997) 2143-2147.

The Superallys, Eds. C. Sims, W. Hagel, John Wiley, New York, 1972.

R. Jensen, T. Tien, Met. Trans. A 16 (1985) 1049-1068.

J. King, Mat. Sci. Techn. 3 (1987) 750-764.

P. Hicks, C.J. Altsletter, Met. Trans. A 21 (1990) 365-380.

H.K.D.H. Bhadeshia, Nickel Based Superalloys, Retrieved April 10, 2017, from http://www.msm.cam.ac.uk/phase-trans/2003/Superalloys/superalloys.html

Published
2017-06-30
Section
Articles - archived