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Phase relations in the Fe-Ni-Cr-S system and the sulfidation of an austenitic stainless steelThe stability fields of various sulfide phases that form on Fe-Cr, Fe-Ni, Ni-Cr and Fe-Cr-Ni alloys were developed as a function of temperature and the partial pressure of sulfur. The calculated stability fields in the ternary system were displayed on plots of log P sub S sub 2 versus the conjugate extensive variable which provides a better framework for following the sulfidation of Fe-Cr-Ni alloys at high temperatures. Experimental and estimated thermodynamic data were used in developing the sulfur potential diagrams. Current models and correlations were employed to estimate the unknown thermodynamic behavior of solid solutions of sulfides and to supplement the incomplete phase diagram data of geophysical literature. These constructed stability field diagrams were in excellent agreement with the sulfide phases and compositions determined during a sulfidation experiment.
Document ID
19780009204
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Jacob, K. T. (Calif. Univ. Berkeley, United States)
Rao, D. B. (Calif. Univ. LBL Berkeley, Calif., United States)
Nelson, H. G. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1977
Subject Category
Chemistry And Materials (General)
Report/Patent Number
A-7309
NASA-TM-78465
Accession Number
78N17147
Funding Number(s)
PROJECT: RTOP 505-01-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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