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RESEARCH PAPERS

A New Correlation Between MC Precipitate Size, Aging Time and Temperature for an Advanced Austenitic Steel

[+] Author and Article Information
J. A. Todd

Department of Metallurgical and Materials Engineering, Illinois Institute of Technology, Chicago, IL 60616

J. C. Ren

Chung Shan Institute of Science and Technology, Taiwan

J. Pressure Vessel Technol 114(3), 364-368 (Aug 01, 1992) (5 pages) doi:10.1115/1.2929053 History: Received March 22, 1991; Revised March 23, 1992; Online June 17, 2008

Abstract

The MC precipitate size distributions have been measured for times of 1, 10, 100, 300 and 1000 hr at 700 and 900° C in a 16Ni-14Cr advanced austenitic steel. A new correlation between the mean precipitate size, aging time and temperature has been developed. The new correlation is compatible with a solute exhaustion mechanism, which may explain why (i) the MC precipitates formed on matrix dislocations resist coarsening for up to 3000 hr at 900°C; and (ii) the degree of cold work (i.e., the dislocation density), which determines the number of MC nucleation sites, controls the limiting precipitate size.

Copyright © 1992 by The American Society of Mechanical Engineers
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