脆性き裂伝播停止性能の優れた表層超細粒鋼板

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The present study is related to a steel plate with remarkably improved fracture propagation arrest capability (crack arrestability) to minimize damage to a steel structures by preventing the propagation of cracks which may initiate due to unexpected accidents or the like. The steel plate is a hybrid-type steel plate (with multi-layer structure in its thickness direction) whose surface layer has remarkably high resistance to brittle fracture. The surface layer consists of ultra fine grains of 1 to 3μm. The level of grain size has realized on an industrial basis for the first time in the world, and crystal orientation which is resistant to brittle fracture. Even if a brittle crack propagates in the plate, the surface layers may not fracture or fracture in a ductile manner absorbing crack propagation energy (forming so-called "shear-lip") so that the brittle crack arrestability is remarkably improved. As a new technology for producing this steel plate economically on an industrial basis, a "metallurgical phenomenon in which the microstructure of steel is refined to ultra fine grains by rolling during temperature rise" was found : When an accelerated cooling is applied interrupting rolling the plate, the surface layer of the plate is once cooled, but subsequently re-heated by internal heat in the mid-thickness of the plate. If rolling is carried out during the re-heated process, the metallurgical phenomenon described above can be realized in the commercial manufacturing process.
社団法人日本鉄鋼協会の論文

脆性き裂伝播停止性能の優れた表層超細粒鋼板

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