ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Life Extension of Creep Damaged Low Alloy Steel Welds by Regenerative Heat Treatment
Masashi OzakiFumitoshi SakataMasaru KodamaNobuhiko Nishimura
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JOURNALS FREE ACCESS

2010 Volume 50 Issue 8 Pages 1217-1223

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Abstract

Weldments in high-energy piping of fossil power plants are known to suffer extensive creep damage over the course of long-term operations. This damage appears in the form of macro cracks, which result from the formation and linkage of creep cavities at the grain boundaries. It has been reported that creep cavities become sintered when subjected to compressive stress at high temperatures, and, if they could be eliminated before they develop into macro cracks, it was considered that this would enable life extension of components. This paper presents a process of regenerative heat treatment for the life extension of low alloy steel weldments by means in localized high-temperature heating of deteriorated locations. It is shown that recovery of creep life is attained as a result of high temperature compression tests and heat cycles around the A3 transformation temperature.

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© 2010 by The Iron and Steel Institute of Japan
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