900∿600℃温度域における鋼の脆化特性 : 連鋳々片の表面横割れに関連して(<特集>鋼の連続)

概要

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The embrittlement of carbon steels in the temperature range from 900 to 600℃ was studied by the hotstage tensile test as well as fractographic analyses, and the mechanism of formation of transverse facial cracks in the continuously cast steels was discussed in terms of this embrittlement. Factors affecting the embrittlement are the austenite grain size, the precipitates such as sulfide and oxide and the film-like proeutectoid ferrite formed along the austenite grain boundary. Thus, lowering the impurity content, refinement of the austenite grain and also slower rate of cooling are effective to minimize this embrittlement. However, the best way to have sound slabs is to avoid this poor ductility temperature region at the bending point.
社団法人日本鉄鋼協会の論文
1981-06-01