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11394 Damage Mechanisms in Creep Strength Enhanced Ferritic (CSEF) Steels (T91 and T23)

Picture for 11394 Damage Mechanisms in Creep Strength Enhanced Ferritic (CSEF) Steels (T91 and T23)
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Product Number: 51300-11394-SG
ISBN: 2011 11394 CP
Author: Catherine A. Noble and Ronald E. Munson
Publication Date: 2011
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The use of Creep Strength Enhanced Ferritic Steels (CSEFs), such as T91 and T23, is becoming more prevalent as boilers are used in cycling service and at higher steam temperatures. The service experience of these materials has presented some unpleasant surprises. There are several damage mechanisms that are commonly found in these types of materials that will be discussed. These mechanisms include both anodic and cathodic stress corrosion cracking (SCC), brittle fracture induced by improper processing, creep, and service-induced hydrogen cracking. Examples of several of these failures are included.

Key words: CSEF steels, tube damage mechanisms, SCC, hydrogen cracking, brittle fracture, T91, T23, creep
The use of Creep Strength Enhanced Ferritic Steels (CSEFs), such as T91 and T23, is becoming more prevalent as boilers are used in cycling service and at higher steam temperatures. The service experience of these materials has presented some unpleasant surprises. There are several damage mechanisms that are commonly found in these types of materials that will be discussed. These mechanisms include both anodic and cathodic stress corrosion cracking (SCC), brittle fracture induced by improper processing, creep, and service-induced hydrogen cracking. Examples of several of these failures are included.

Key words: CSEF steels, tube damage mechanisms, SCC, hydrogen cracking, brittle fracture, T91, T23, creep
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