Effect of Reversion Heat treatment on Duplex Stainless Steels - Couverture souple

Vasantha Kumar, Shamanth; Shankar K. S., Ravi

 
9786139952359: Effect of Reversion Heat treatment on Duplex Stainless Steels
Couverture souple
ISBN 10 : 6139952352 ISBN 13 : 9786139952359
Editeur : LAP LAMBERT Academic Publishing, 2018

Synopsis

The thermal aging embrittlement of duplex stainless steels is one of the key material property degradation that would limit their industrial applicability. In this investigation, we study the effect of reversion heat treatment on the mechanical properties of the thermally embrittled steels. The samples were solutionized, aged, reversion heat treated and re-aged. The tensile strength of the aged sample had increased with respect to the solutionized condition because in aged condition, the ferrite phase was spinodally decomposed into iron rich alpha (α) and chromium rich alpha-prime (αˈ) precipitates and also the chromium nitride precipitates was found along with these precipitates. The 60 minutes reversion heat treated samples showed a maximum recovery in tensile strength of upto 92% with respect to the solutionized condition because the temperature of 550 ⁰C is above the (α + αˈ) miscibility gap, the ferritic phase was homogenized again. In other words, Ferich α and Cr-rich αˈ prime precipitates which were formed during ageing become thermodynamically unstable and dissolve inside the ferritic phase.

Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.

Présentation de l'éditeur

The thermal aging embrittlement of duplex stainless steels is one of the key material property degradation that would limit their industrial applicability. In this investigation, we study the effect of reversion heat treatment on the mechanical properties of the thermally embrittled steels. The samples were solutionized, aged, reversion heat treated and re-aged. The tensile strength of the aged sample had increased with respect to the solutionized condition because in aged condition, the ferrite phase was spinodally decomposed into iron rich alpha (α) and chromium rich alpha-prime (αˈ) precipitates and also the chromium nitride precipitates was found along with these precipitates. The 60 minutes reversion heat treated samples showed a maximum recovery in tensile strength of upto 92% with respect to the solutionized condition because the temperature of 550 ⁰C is above the (α + αˈ) miscibility gap, the ferritic phase was homogenized again. In other words, Ferich α and Cr-rich αˈ prime precipitates which were formed during ageing become thermodynamically unstable and dissolve inside the ferritic phase.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
LAP LAMBERT Academic Publishing
Date d'édition
2018
Langue
anglais
ISBN 10 
6139952352
ISBN 13 
9786139952359
Reliure
Broché
Nombre de pages
136
Coordonnées du fabricant
non disponible
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