Effect of Thermal Cycle and Nitrogen Content on the Hot Ductility of Boron-bearing Steel

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概要

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• Hot ductility of Boron (B)-bearing steel has been examined in view of slab corner cracking problem. Addition of B to the low carbon steel reduced its hot ductility under a thermal cycle in which samples were cooled directly to the test temperature before straining. The change in hot ductility of B-bearing steel with deformation temperature showed one trough in the temperature range of 800–1000°C, which covered the lower temperature region of austenite single phase (region (I)), and near the austenite/ferrite transformation temperature (Ae3) (region (II)). An abrupt temperature decrease and reheating before straining heavily deteriorated the hot ductility of B-bearing steel in the region (I). In all steels, the strain concentration in the film-like ferrite primarily reduced hot ductility in region (II) regardless of the addition of B and the thermal cycles before straining. The ductility reduction of B-bearing steel is caused by the distribution and amount of BN precipitation, which is determined by the thermal cycles and the N content. Increase in the N content remarkably reduced hot ductility of B-bearing steel in region (I), where the behavior of BN precipitates controlled hot ductility. The results shows that the improvement of hot ductility in B-bearing steel can be attained by decreasing the N content and by avoiding an abrupt temperature decrease in the secondary cooling stage of the slab after solidification.

• 社団法人 日本鉄鋼協会の論文

著者

• CHO Kyung

  Department of Internal Medicine, Chonnam National University Hospital

• Koo Yang

  Graduate Inst. Of Ferrous Technol. Pohang Univ. Of Sci. And Technol.

• Mun Dong

  Graduate Institute of Ferrous Technology, Pohang University of Science and Technology

• Kang Myeong

  Graduate Institute of Ferrous Technology, Pohang University of Science and Technology

• Lee Jae

  Graduate Institute of Ferrous Technology, Pohang University of Science and Technology

• Park Joong

  POCAST Research & Development Project Department, POSCO

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