발간논문

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Vol.38, No.5, 675 ~ 681, 2000
Title
Pesearch Paper / Mechanical Behavior : The Effects of the Local Fracture Stress and Carbides on the Cleavage Fracture Characteristics of Mn-Mo-Ni Low Alloy Steels in the Transition Region
양원준Won Jon Yang,허무영Moo Young Huh,노성주Sung Joo Roh,이봉상Bong Sang Lee,오용준Yong Jun Oh,홍준화Jun Hwa Hong
Abstract
In the ductile-brittle transition temperature region of SA508 Cl.3 Mn-Mo-Ni low alloy steels, the relationship of the local fracture stress and carbides influencing the cleavage fracture behavior was investigated. Based on the ASTM E1921-97 standard method, the reference transition temperatures were determined by three point bending fracture toughness tests. A local fracture stress, σ^*_f, was determined from a theoretical stress distribution in front of crack tip using the cleavage initiation distance measured in each fractured specimen surface. The local fracture stress values showed a strong relationship with toughness characteristics of the materials and those were larger in the materials of smaller carbide size. Quantitative analysis of carbides showed that carbides larger than a certain size are mainly responsible for the cleavage fracture in the ductile-brittle transition temperature region.
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