Effect of microstructure on the cleavage fracture strength of low carbon Mn-Ni-Mo bainitic steels
SCIE
SCOPUS
- Title
- Effect of microstructure on the cleavage fracture strength of low carbon Mn-Ni-Mo bainitic steels
- Authors
- Im, YR; Lee, BJ; Oh, YJ; Hong, JH; Lee, HC
- Date Issued
- 2004-01-01
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- The effects of the microstructure on the cleavage fracture strength of low carbon Mn-Ni-Mo bainitic steels were examined. A four-point bend test and double-notched bend specimens were used to measure the cleavage fracture strength of the alloys and identify the cleavage initiating micro-cracks, respectively. The cleavage fracture strength and DBTT of Mn-Ni-Mo bainitic steels were strongly affected by the alloy carbon content. The decrease in the alloy carbon content resulted in a decrease in the inter-lath cementite-crowded layers and higher cleavage fracture strength. Microcracks that formed across the inter-lath cementite-crowded layers were observed to initiate cleavage fracture. The width of these inter-lath cementite-crowded layers was accepted as a cleavage initiating micro-crack size in the micromechanical modeling of the cleavage fracture, and the measured cleavage strength values of the bainitic Mn-Ni-Mo steels were well represented by the modified Griffith relationship. (C) 2003 Elsevier B.V. All rights reserved.
- Keywords
- PRESSURE-VESSEL STEEL; BRITTLE-FRACTURE; HYDROSTATIC TENSION; WELD METAL; TOUGHNESS; INITIATION; STRESS; STRAIN
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/108145
- DOI
- 10.1016/j.jnucmat.2003.09.003
- ISSN
- 0022-3115
- Article Type
- Article
- Citation
- JOURNAL OF NUCLEAR MATERIALS, vol. 324, no. 1, page. 33 - 40, 2004-01-01
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