Effect of Composition and Thermo-Mechanical Processing on Microstructure Development in Ni-30Fe-Nb-C Model Alloys

Abstract:

The unavoidable phase transformation upon cooling makes a direct observation of austenite microstructure impossible. One of the methods to investigate the high temperature condition of austenite is to use a model alloy, which would not transform to martensite on quenching. In the present work the recrystallisation and grain growth of austenite during thermo-mechanical processing (TMP) were studied for three Ni-30Fe-Nb-C alloys containing 0.33, 0.85 and 1.42 wt% Nb. The austenite microstructures were characterised using optical and scanning electron microscopy, and energy dispersive X-ray spectroscopy. The austenite recrystallisation kinetics was investigated with respect to the precipitate distribution variations. A relative strength of the grain boundary pinning effect from solute Nb and precipitated particles is discussed.

• Periodical: Advanced Materials Research (Volume 922)
• Pages: 475-480
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.922.475
• Online since: May 2014
• Authors: Parvez Mannan*, Andrii G. Kostryzhev, Elena V. Pereloma
• Keywords: Grain Growth, Nb Precipitation, Recrystallization, Thermo-Mechanical Processing

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