Effect of long-term thermal aging on the mechanical properties of casting duplex stainless steels

2012 ◽  
Vol 551 ◽  
pp. 116-121 ◽  
Author(s):  
Y.H. Yao ◽  
J.F. Wei ◽  
Z.P. Wang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steels ◽  
Thermal Aging ◽  
Duplex Stainless Steels

Prediction Method of Tensile Properties and Fracture Toughness of Thermal Aged Cast Duplex Stainless Steel Piping

2005 ◽  
Author(s):  
Seiichi Kawaguchi ◽  
Takeharu Nagasaki ◽  
Koji Koyama
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Stainless Steels ◽  
Thermal Aging ◽  
Power Plants ◽  
True Strain ◽  
Prediction Method ◽  
Strain Curve ◽  
Duplex Stainless Steels

Cast duplex stainless steels of CF8M and CF8 are used in major components because of their superior characteristics, such as corrosion resistance, weldability, and so on. However, these stainless steels are known to have tendency of thermal aging embrittlement after long term service. Therefore, the mechanical properties have been investigated using tensile test specimens and fracture toughness specimens aged at 300 to 450°C for up to 40,000 hours. From the results, the effects of thermal aging on the mechanical properties of these cast duplex stainless steels were identified. The true stress-true strain curve prediction method (TSS model) and fracture toughness prediction method (H3T model) after long term service were established. These prediction methods are used for the evaluation on the plant life management of nuclear power plants in Japan.

Hardening of Aged Duplex Stainless Steels by Spinodal Decomposition

2004 ◽  
Vol 10 (3) ◽  
pp. 349-354 ◽  
Author(s):  
F. Danoix ◽  
P. Auger ◽  
D. Blavette
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Spinodal Decomposition ◽  
Stainless Steels ◽  
Aging Process ◽  
Atom Probe ◽  
Duplex Stainless Steels ◽  
Detailed Knowledge ◽  
Iron Chromium

Mechanical properties, such as hardness and impact toughness, of ferrite-containing stainless steels are greatly affected by long-term aging at intermediate temperatures. It is known that the α-α′ spinodal decomposition occurring in the iron–chromium-based ferrite is responsible for this aging susceptibility. This decomposition can be characterized unambiguously by atom probe analysis, allowing comparison both with the existing theories of spinodal decomposition and the evolution of some mechanical properties. It is then possible to predict the evolution of hardness of industrial components during service, based on the detailed knowledge of the involved aging process.

Effects of long-term thermal aging on bulk and local mechanical behavior of ferritic-austenitic duplex stainless steels

2018 ◽  
Vol 720 ◽  
pp. 130-139 ◽  
Author(s):  
Samuel C. Schwarm ◽  
Sarah Mburu ◽  
R. Prakash Kolli ◽  
Daniel E. Perea ◽  
Sreeramamurthy Ankem
Keyword(s):  
Mechanical Behavior ◽  
Stainless Steels ◽  
Thermal Aging ◽  
Duplex Stainless Steels

scholarly journals Thermal Aging Phenomena in Cast Duplex Stainless Steels

JOM ◽  
2015 ◽  
Vol 68 (2) ◽  
pp. 507-516 ◽  
Author(s):  
T. S. Byun ◽  
Y. Yang ◽  
N. R. Overman ◽  
J. T. Busby
Keyword(s):  
Stainless Steels ◽  
Thermal Aging ◽  
Duplex Stainless Steels ◽  
Aging Phenomena

Mechanical Properties of Epoxy Adhesive Under Thermal Aging and Their Chemical Degradation Behavior

2021 ◽  
Vol 21 (8) ◽  
pp. 4444-4449
Author(s):  
Bongjin Chung ◽  
Shin Sungchul ◽  
Jaeho Shim ◽  
Seongwoo Ryu
Keyword(s):  
Mechanical Properties ◽  
Thermal Aging ◽  
Photoelectron Spectroscopy ◽  
Thermal Exposure ◽  
Chain Scission ◽  
Epoxy Adhesive ◽  
Chemical Degradation ◽  
Adhesive Properties ◽  
Noticeable Reduction

Epoxy adhesive was analyzed under long term thermal aging and mechanical properties and chemical degradation were observed by X-ray photoelectron spectroscopy (XPS). Long term thermal exposure of epoxy causes a noticeable reduction in adhesive properties. We developed a predictive model of temperature and time dependent aging. The temperature dependent aging behavior of epoxy adhesive shows good agreement with conventional Arrhenius equations. Using XPS analysis, we also discovered a correlation between chemical degradation and the adhesive properties. Decay of C–C bonding ratio induced chain-scission of epoxy adhesive; increase of total numbers of C–O and C═O induced oxidation of epoxy adhesive during thermal exposure.

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