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利用高分辨同步輻射Micro-CT定量三維表征含Ti鐵素體不銹鋼鑄坯中氧化物夾雜
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-10-16
采用高分辨同步輻射計算機微斷層掃描技術(Micro-CT)對含Ti鐵素體不銹鋼鑄坯中氧化物夾雜進行了三維檢測, 定量分析了氧化物夾雜數量、體積和尺寸等特征在鑄坯厚度方向的分布規律, 并與自動掃描電鏡 ASPEX 的二維檢測結果對比.
利用高分辨同步輻射Micro-CT定量三維表征含Ti鐵素體不銹鋼鑄坯中氧化物夾雜QUANTITATIVE 3D CHARACTERIZATION ON OXIDE INCLUSIONS IN?SLAB OF Ti BEARING FERRITIC STAINLESS STEEL USING HIGH?RESOLUTION SYNCHROTRON MICRO-CT
采用高分辨同步輻射計算機微斷層掃描技術(Micro-CT)對含Ti鐵素體不銹鋼鑄坯中氧化物夾雜進行了三維檢測, 定量分析了氧化物夾雜數量、體積和尺寸等特征在鑄坯厚度方向的分布規律, 并與自動掃描電鏡 ASPEX 的二維檢測結果對比. 結果表明, Micro-CT 能夠更準確地實現鋼中夾雜物的無損檢測. Micro-CT 檢測到的氧化物基本都為球形, 各位置夾雜物數量隨著尺寸的增加而減少. 氧化物數量密度和體積分數整體上在鑄坯厚度中心最大, 并隨著距厚度中心的距離增加而減小, 在鑄坯表層附近達到最小值. 而氧化物平均等效直徑在鑄坯表層附近最大, 在內弧 1/4 厚度附近最小.
Non-metallic inclusions especially oxides are detrimental to the quality of ferritic stainless steel?products. Accurate characterization on inclusions is conducive to further research on the inclusion control. There ?are some disadvantages in traditional 2D or 3D inclusion detection methods, tomography is thus employed to?characterize inclusions in steel in the current work. Oxide inclusions in the slab of Ti bearing ferritic stainless steel?were characterized 3 dimensionally using high resolution synchrotron micro computed tomography (Micro-CT),?and the variations of quantity, volume and size of oxide inclusions along the thickness of continuous casting slab?were analyzed quantitatively and compared with the 2-dimensional results detected by ASPEX, an automated?scanning SEM. It was found that non-destructive detection could be well done by Micro-CT more accurately. The?detected oxides by Micro-CT were mainly global, and the number of inclusions decreased with increasing size. In?general, the number density and volume fraction of oxides were largest in the center of slab thickness, and?decreased with the distance from center, reached the smallest value near the surface of slab. Contrarily, the?average of equivalent diameter of oxide inclusions was largest near slab surface, and was smallest near quarter of?thickness on the loose side.?
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