Evaluation of Plane Strain Fracture Toughness in the Ductile-Brittle Transition Temperature Region. 1st Report. Plane Strain Condition considered with the Crack Initiation Point.

1991 ◽  
Vol 57 (542) ◽  
pp. 2568-2574
Author(s):  
Kazunari MOGAMI ◽  
Kotoji ANDO ◽  
Nobukazu OGURA
Keyword(s):  
Fracture Toughness ◽  
Transition Temperature ◽  
Plane Strain ◽  
Strain Condition ◽  
Plane Strain Fracture Toughness ◽  
Initiation Point ◽  
Brittle Transition ◽  
Ductile Brittle Transition Temperature ◽  
Strain Fracture ◽  
Brittle Transition Temperature

Evaluation of Ductile-Brittle Transition of Fracture Toughness by Material Degradation

2005 ◽  
Vol 297-300 ◽  
pp. 2465-2470 ◽  
Author(s):  
Chang Sung Seok ◽  
Hyung Ick Kim ◽  
Dae Jin Kim ◽  
Bong Kook Bae ◽  
Sang Pil Kim
Keyword(s):  
Fracture Toughness ◽  
Transition Temperature ◽  
Nuclear Power ◽  
Power Plants ◽  
Test Method ◽  
Fracture Toughness Test ◽  
Brittle Transition ◽  
Ductile Brittle Transition Temperature ◽  
Specimen Test ◽  
Brittle Transition Temperature

When huge energy transfer systems like nuclear power plants and steam power plants are operated for long times at high temperatures, mechanical properties change and ductile-brittle transition temperature increases by degradation. So we must estimate the degradation in order to assess safety, life expectancy, and other operation parameters. The sub-sized specimen test method using the surveillance specimen, and BI (Ball Indentation) method were developed for evaluating the integrity of metallic components. In this study, we will present the evaluation of the ductile-brittle transition temperature using the BI test and the sub-sized specimen test. The four classes of the thermally aged 1Cr-1Mo-0.25V specimens were prepared using an artificially accelerated aging method. The tensile test, the fracture toughness test, and the BI test were performed. The results of the fracture toughness tests using the sub-sized specimens were compared with those of the BI test. The evaluation technique of the ductile-brittle transition temperature using the BI test was also discussed. Our results show that the ductile-brittle transition temperatures rose as the aging time increased. We suggested that the fracture toughness results of the sub-sized specimen test and the IEF results of the BI test could be used in the estimation of the ductile-brittle transition temperature as material degrades.

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