Segregation and Precipitation Behavior of Phosphorus in a Ni-Fe-Cr Base Wrought Superalloy

Abstract:

The segregation and precipitation behavior of phosphoruswas studied in aNi-Fe-Cr base wroughtsuperalloy. The precipitation behavior of phosphides in the alloy contained 0.025% Pwas examined after soaking at 750-1080°C to determine the precipitation temperature range of MNP-type phosphide. The microstructuresunder these various conditions wereinvestigated by scanning electron microscope(SEM) and energy dispersive spectroscopy (EDS). The precipitation temperature of the phosphide in the alloy was determined to be in the range of 850-1040 °C and the precipitation peak temperature was around 980°C.In addition, the melting temperatureof the phosphide was determined to be between 1200 °C and 1250 °C. The current results indicate the tendency of phosphorus segregated at grain boundaries.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 150-156
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.150
• Online since: February 2018
• Authors: Sha Zhang*, An Wen Zhang, Wei Yang Wang, Xin Xin, Kai Zhang
• Keywords: Grain Boundary Segregation, Phosphide, Phosphorus, Precipitation, Wrought Superalloy

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