13. Analysis of Brittle Crack Propagation in TMCP Steel Rolled at Temperature in Austenite-Ferrite Region

概要

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It is well known that the TMCP steel rolled in the temperature of austenite-ferrite region has high brittle crack arrestability (K_<ca>). The cause is generally considered to be related with the generation of separations on the brittle fracture surfaces for TMCP steel plate with high K_<ca>. In this paper, the authors carried out not only the double tension tests but also the CTOD tests and the Charpy impact tests with various test directions by using two TMCP steel plates, which are produced from same slab but are rolled at the different finishing temperature. Thus leads to different maximum separation index. By analyzing these test results, it is understood that high K_<ca> value comes from zigzag path of brittle crack which is caused by anisotropy of fracture toughness of steel plates.
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