2205雙相不銹鋼之低溫時效脆性與相變態研究
Date Issued
2004
Date
2004
Author(s)
DOI
922216E002031
Abstract
The effect of isothermal treatment (at
temperatures ranging between 400 and 500℃)
on the embrittlement of a 2205 duplex stainless
steel (with 45 ferrite–55 austenite, vol%) has
been investigated. The impact toughness and
hardness of the aged specimens were measured,
while the corresponding fractography was
studied. The results show that the steel is
susceptible to severe embrittlement when
exposed at 475 ℃; this aging embrittlement is
analogous with that of the ferritic stainless
steels, which is ascribed to the degenerated
susceptible to severe embrittlement when
exposed at 475 ℃; this aging embrittlement is
analogous with that of the ferritic stainless
steels, which is ascribed to the degenerated
ferrite phase. High-resolution transmission
electron microscopy reveals that an isotropic
spinodal decomposition occurred during aging
at 475 ℃ in the steel studied; the original
δ-ferrite decomposed into a nanometer-scaled
modulated structure with a complex
interconnected network, which contained an
iron-rich BCC phase (α) and a
chromium-enriched BCC phase (α΄). It is
suggested that the locking of dislocations in the
modulated structure leads to the severe
embrittlement.
Subjects
Duplex stainless steel
Embrittlement
Impact toughness
Hardness
Spinodal decomposition
Publisher
臺北市：國立臺灣大學材料科學與工程學研究所
Type
report
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