| Title |
Research Papers / Mechanical Behaviors : Analysis of Fracture Toughness in Transition Temperature Region of a Mn-Mo-Ni Low - Alloy Steel |
| Authors |
김상호(Sang Ho Kim),황병철(Byoung Chul Hwang),이성학(Sung Hak Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Mn-Mo-Ni low - alloy steel ; ASTM E1921 stand test method ; Elastic - plastic cleavage fracture toughness ; Weibull distribution ; Critical distance ; Stretch zone width |
| Abstract |
This study is concerned with the analysis of fracture toughness in the transition region of a Mn-Mo-Ni low-alloy steel according to ASTM E1921 standard test method. Elastic-plastic cleavage fracture toughness, K_Jc was determined by 3-point bend tests, using precracked Charpy V-notch (PCVN) specimens, and then the measured K_Jc, values were interpreted by the 3-parameter Weibull distribution with a theoretical slope of 4. Fractographic observation indicated that the critical distance from a precrack tip to a cleavage initiation site linearly increased with increasing the critical J(J_c) value, and that the stretch zone width had a good correlation with K_Jc value, irrespective of testing temperature. Relationship between J_c and critical distance, local fracture stress, and plane strain fracture toughness were discussed on the basis of the cleavage fracture behavior in the transition temperature region. |