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Metals 2019, 9(3), 301; https://doi.org/10.3390/met9030301

Mechanical Behavior of Inconel 625 at Elevated Temperatures

1
Center for Materials Science and Technology, Instituto de Pesquisas Energéticas e Nucleares, São Paulo 05508-000, Brazil
2
Department of Mechanical Engineering, Instituto Federal de Educação, Ciência e Tecnologia de São Paulo—IFSP, São Paulo 01109-010, Brazil
3
Department of Materials Engineering and Nanotechnology, Universidade Presbiteriana Mackenzie, São Paulo 01302-907, Brazil
4
Science and Technology Department, Universidade Federal de São Paulo—UNIFESP, São José dos Campos 12231-280, Brazil
5
Department of Aeronautical and Mechanical Engineering, Instituto Tecnológico de Aeronáutica—ITA/DCTA, São José dos Campos 12228-900, Brazil
6
Department of Production Engineering, São Paulo State University (UNESP), Campus of Itapeva, Itapeva 18409-010, Brazil
*
Author to whom correspondence should be addressed.
Received: 27 December 2018 / Revised: 5 February 2019 / Accepted: 9 February 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Alloys for High-Temperature Applications)
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Abstract

Inconel 625 is a nickel-based alloy that is mainly used in high-temperature applications. Inconel 625 exhibits an unstable plastic flow at elevated temperatures characterized by serrated yielding, well-known as the Portevin-Le Chatelier effect. The evaluation of the mechanical properties of Inconel 625 at high temperatures is the aim of this work. The tensile tests were executed in temperatures ranging from room temperature to 1000 °C with strain rates of 2 × 10−4 to 2 × 10−3 s−1. The creep tests were executed in the temperature range of 600–700 °C and in the stress range of 500–600 MPa in a constant load mode. The optical and scanning electron microscopes were used for surface fracture observation. In the curves obtained at 200–700 °C the serrated stress-strain behavior was observed, which was related to the dynamic strain aging effect. The yield strength and the elongation values show anomalous behavior as a function of the test temperature. An intergranular cracking was observed for a specimen tensile tested at 500 °C that can be attributed to the decohesion of the carbides along the grain boundaries. The fracture surface of the specimen tensile tested at 700 °C showed the predominance of transgranular cracking with tear dimples with a parabolic shape. View Full-Text
Keywords: Inconel; high temperature; tensile test; creep; serrated; dynamic strain aging Inconel; high temperature; tensile test; creep; serrated; dynamic strain aging
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de Oliveira, M.M.; Couto, A.A.; Almeida, G.F.C.; Reis, D.A.P.; de Lima, N.B.; Baldan, R. Mechanical Behavior of Inconel 625 at Elevated Temperatures. Metals 2019, 9, 301.

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