Ti 添加 IF 鋼における析出物高精度分析

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A more precise quantitative analysis of precipitates in Ti-bearing Interstitial-Free (IF) steel is made through the combination of both a Field-Emission Transmission Electron Microscope (FE-TEM) analysis and an analysis based upon chemical extraction and isolation. The non-stoichiometry of precipitates is precisely determined using either Energy Dispersive X-ray spectroscopy (EDX) or a new method by plasmon energy in Electron Energy-Loss Spectroscopy (EELS) attached to FE-TEM. The non-stoichiometric compositions of each precipitate are taken into consideration in the quantitative analysis. The precise quantitative method is applied to both the hot-rolled and the annealed steels in the process condition : the reheating temperature : 1220 deg. C, the finishing hot-rolling temperature : 890 deg. C, the hot-rolling coiling temperature : 680 deg. C and the annealing temperature : 770 deg. C. The precipitates are quantitatively analyzed from the viewpoint of the interstitial elements ; nitrogen, sulfur and carbon. All the nitrogen is precipitated as TiN when hot-rolling is completed. Most of the sulfur-related precipitate is TiS_<1.25> in the hot-rolled steel. The rest are Ti_4C_2S_2 and (Mn, Fe)S_<1.25>. After annealing, TiS_<1.25> decreases, while Ti_4C_2S_2 increases significantly and (Mn, Fe)S_<1.25> slightly increases. Not all the carbon is combined with Ti in the hot-rolled steel and a lot of "free carbon" still remains even after the hot-rolling process is finished. After the annealing process, both TiC_<0.85> and Ti_4C_2S_2 increase in quantity dramatically.
社団法人日本鉄鋼協会の論文
1997-08-01

Ti 添加 IF 鋼における析出物高精度分析

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