Ti 添加極低炭素鋼における Ti 系炭硫化物の析出挙動

概要

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Precipitation behaviour of titanium carbo-sulfide in extra-low-carbon titanium-added steels was studied in detail by Transmission Electron Microscopy (TEM). Co-precipitation of TiS and MnS was observed to form in chain-like groups at austenite grain boundaries during holding the specimen at 950℃ after reheating at 1250℃. This seemed to result from preferential precipitation at interfaces with the help of preceding grain boundary of S. On the other hand, hot working at 950℃ suppressed the co-precipitation of TiS and MnS at austenite grain boundaries through recrystallization, and enhanced the straininduced Ti_4C_2S_2 homogeneous precipitation within austenite grains. In the case of reheating at 1250℃ followed by holding at 950℃, and then keeping at 700℃, co-precipitated TiS and MnS at prior austenite grain boundaries gradually changed to Ti_4C_2S_2 with the keeping time, and also fine precipitation of Ti_4C_2S_2 additionally occurred within ferrite grains.
社団法人日本鉄鋼協会の論文
1995-03-01