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Modeling High-Alloy Chromium-Nickel Alloy Nanostructuring with Treatment by Highly-Concentrated Energy Sources

Authors
  • Krivonosova, E. A.1
  • 1 Perm National Research Polytechnic University, Perm, Russia , Perm (Russia)
Type
Published Article
Journal
Metallurgist
Publisher
Springer US
Publication Date
Sep 01, 2016
Volume
60
Issue
5-6
Pages
478–482
Identifiers
DOI: 10.1007/s11015-016-0318-3
Source
Springer Nature
Keywords
License
Yellow

Abstract

A mathematical model is provided for phase transformation thermodynamics making comprehensive study possible for the equilibrium phase composition of chromium-nickel welded joints at different temperatures. According to the model, with a chromium content of more than 22 wt.% the temperature for the start of intermetallic precipitation exceeds the solidus temperature for Cr–Ni alloy, i.e., in this case precipitation of primary Ni3Al intermetallic is thermodynamically possible. Primary Ni3Ti precipitates are probable with a chromium content of more than 36 wt.%. Model calculations are confirmed by microstructural studies. In order to improve welded joint strength for the alloy in question, slow joint cooling in the range below 1000°C is recommended, depending on welded structure operating temperature, and ageing in the range of intense γ′-phase precipitation, i.e., 900–600°C. The mathematical model developed for phase transformation thermodynamics may be used for studying the phase composition of other chromium-nickel alloys.

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