scholarly journals DE-NE0000724 - Research Performance Final Report - Investigation of Thermal Aging Effects on the Evolution of Microstructure and Mechanical Properties of Cast Duplex Stainless Steels

2017 ◽  
Author(s):  
Sreeramamurthy Ankem ◽  
Daniel E. Perea ◽  
R. Prakash Kolli ◽  
Sarah Mburu ◽  
Samuel C. Schwarm
Keyword(s):  
Mechanical Properties ◽  
Stainless Steels ◽  
Thermal Aging ◽  
Research Performance ◽  
Duplex Stainless Steels ◽  
Final Report ◽  
Aging Effects ◽  
Microstructure And Mechanical Properties ◽  
Evolution Of Microstructure

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.

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