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The relationship between duplex oxidation and structural stability in austenitic stainless steels

✍ Scribed by I. R. McLauchlin; R. Hales

Publisher
John Wiley and Sons
Year
1978
Tongue
German
Weight
520 KB
Volume
29
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

Samples of austenitic stainless steels from various sources have been thermally cycled. Many materials exhibited a volume expansion on cooling superimposed on the normal thermal contraction, as a result of an austenite β†’ ferrite phase transformation. Samples of materials which exhibited the ferrite transformation also show a period of rapid oxidation on re‐exposure after cooling during the first autoclave shutdown of an oxidation test. It is proposed that the local volume expansion accompanying the formation of ferrite on cooling disrupts the initial protective oxide scale thereby allowing oxidation to proceed more rapidly.

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