直接焼入れ-焼もどし法における 80kgf/mm^2 級高張力厚鋼板の焼入性とボロン分布の関係

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In the production of 80 kgf/mm^2 grade steel plate with high toughtness by direct-quenching and tempering (DQ-T) process, optimum amounts of B in steel plate is indispensable. Because, if the plate does not contain that, the tensile strength of plate is not necessarily higher than that of reheat-quenched and tempered plate. And, optimum amounts of B are changed by parameters of DQ-T process such as slab reheat, and finish-rolling temperatures and plate chemistry. In this paper, an investigation has been made on the effect of B behavior and change in γ-grains during the period between finish-rolling and quenching on the plate tensile strength. In particular, existing state and distribution of B were observed by using modified autoradiography (modified FTE technique) which can clearly show B-distribution at the γ-grain boundary and γ-grain matrix. Boron-distribution and γ-grain structure dynamically change depending on the time from finish of rolling to quenching, and this results in change in the hardenability of plate. Enough segregation of solute B at recrystallized γ-grain boundaries increases the hardenability of plate. Whereas the formation of fine precipitate of B conpounds within recrystallized γ-grain and at grain boundaries lowers the hardenability of plate. The model showing relationships between γ-grain structure, B-distribution and hardenability of plates are schematically represented on the basis of experimental results.
社団法人日本鉄鋼協会の論文
1988-01-01

直接焼入れ-焼もどし法における 80kgf/mm^2 級高張力厚鋼板の焼入性とボロン分布の関係

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