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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 12/2010

01-12-2010

Structure and Composition of Nanometer-Sized Nitrides in a Creep-Resistant Cast Austenitic Alloy

Authors: Neal D. Evans, Philip J. Maziasz, John P. Shingledecker, Michael J. Pollard

Published in: Metallurgical and Materials Transactions A | Issue 12/2010

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Abstract

The microstructure of a new and improved high-temperature creep-resistant cast austenitic alloy, CF8C-Plus, was characterized after creep-rupture testing at 1023 K (750 °C) and 100 MPa. Microstructures were investigated by detailed scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy (EDS). Principal component analysis of EDS spectrum images was used to examine the complex precipitate morphology. Thermodynamic modeling was performed to predict equilibrium phases in this alloy as well as the compositions of these phases at relevant temperatures. The improved high-temperature creep strength of CF8C-Plus over its predecessor CF8C is suggested to be due to the modified microstructure and phase stability in the alloy, including the absence of δ-ferrite in the as-cast condition and the development of a stable, slow-growing precipitation hardening nitride phase—the tetragonal Z-phase—which has not been observed before in cast austenitic stainless steels.
previous article A Conversional Model for Austenite Formation in Hypereutectoid Steels
next article Dissolution and Interface Reactions between Palladium and Tin (Sn)-Based Solders: Part I. 95.5Sn-3.9Ag-0.6Cu Alloy

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Metadata
Title
Structure and Composition of Nanometer-Sized Nitrides in a Creep-Resistant Cast Austenitic Alloy
Authors
Neal D. Evans
Philip J. Maziasz
John P. Shingledecker
Michael J. Pollard
Publication date
01-12-2010
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 12/2010
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-010-0321-4

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