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Phase Transformations in an Austenitic Stainless Steel Weld During Postweld Heat Treatment

Published online by Cambridge University Press:  02 July 2020

M. G. Burke  and
N. T. Nuhfer
M. G. Burke
Affiliation:
Bechtel Bettis, Inc., West Mifflin, PA, 15122-0079
N. T. Nuhfer
Affiliation:
Department of Materials Science and Engineering, Carnegie-Mellon University, Pittsburgh, PA, 15213
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Abstract

The microstructural development in a Type 309 stainless steel weldment associated with a post-weld heat treatment of 30 h at 580°C has been studied using analytical electron microscopy (AEM). The purpose of post-weld thermal treatments is generally to relieve stresses within the weld, thereby improving performance. Microstructural stability during these thermal treatments is important for the weld; i.e., no deleterious phases should form. in this example, detailed microstructural analyses of a weldment in the as-welded and postweld heat-treated condition have been performed. Microstructural analyses were performed using Philips CM 12 and CM300-FEG analytical electron microscopes equipped with Oxford Instruments ISIS analyzers and LZ5 energy dispersive x-ray spectrometers, and a CM200-FEG analytical electron microscope equipped with a Gatan Image Filter (GIF).

As-Welded Condition:The microstructure of the weld was characterized by the presence of dislocated austenite (γ) and a network of delta (δ) ferrite.

Type
Microscopy in the Real World: Alloys and Other Materials
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 548 - 549
Copyright
Copyright © Microscopy Society of America 2001

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References

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