scholarly journals Evaluation of Plane-Strain Fracture Toughness in the Ductile-Brittle Transition Temperature Region. 2nd Report. Effects of Plate Thickness on Both the Cleavage Crack Initiation Point and Fracture Toughness.

1991 ◽  
Vol 57 (544) ◽  
pp. 2916-2923 ◽  
Author(s):  
Kotoji ANDO ◽  
Kiichi TSUJI ◽  
Kiichi KITA
Keyword(s):  
Fracture Toughness ◽  
Transition Temperature ◽  
Plate Thickness ◽  
Cleavage Crack ◽  
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.

Evaluation of the Ductile-Brittle Transition Behaviour of Aging Specimens by the Fracture Toughness Test

2006 ◽  
Vol 321-323 ◽  
pp. 536-540
Author(s):  
Hyung Ick Kim ◽  
Yong Huh ◽  
Jae Sil Park ◽  
Chang Sung Seok
Keyword(s):  
Fracture Toughness ◽  
Low Temperatures ◽  
Fracture Toughness Test ◽  
Evaluation Technique ◽  
Brittle Transition ◽  
Ductile Brittle Transition Temperature ◽  
Specimen Test ◽  
Safety And Reliability ◽  
Brittle Transition Temperature ◽  
Transition Behaviour

The safety and reliability of industrial machineries and structures used in various, and severe conditions has become an increasing concern. This study proposes ductile-brittle transition temperature (DBTT) evaluation technique by the sub-sized specimen test to prevent cleavage fracture. Four classes of the thermally aged 1Cr-1Mo-0.25V specimens were prepared. The fracture toughness tests were performed on sub-sized specimens both at room and low temperatures. The results of the fracture toughness tests were analyzed to obtain the DBT behaviours of the specimen materials

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