Inclusions and Microstructure of Steel Weld Deposits with Nanosize Titanium Oxide Addition
Inclusions and Microstructure of Steel Weld Deposits with Nanosize Titanium Oxide Addition
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添加纳米氧化钛的钢焊缝夹杂物和显微组织
DOI：
10.1155/2014/138750
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发表时间：
2014-03
影响因子：
--
通讯作者：
Wang, Sixu
中科院分区：
文献类型：
--
作者：
Peng, Huifen;Yan, Liang;Zhi, Lei;Wang, Sixu
由于氧势和生产工艺参数难以精确控制，直接通过电极将纳米二氧化钛颗粒加入到焊接熔池中。分析了Fe-C-Mn-Si-Ti-O系和Fe-C-Mn-Si-TiO2系的相变特征和夹杂物的热行为。结果表明，添加的二氧化钛颗粒更有利于Mn-Ti-O复合夹杂物的形成，并能降低奥氏体向铁素体的相变温度。在冷却速度为293 K/S-373 K/S的连续冷却条件下，可获得晶内铁素体，钢焊缝中的夹杂物呈球形，主要由TiO2Ti3O5，Ti2O3Ti2O3，MnO和SiO2五种金属组成。夹杂物的平均尺寸为0.67 μm，这些复杂夹杂物在较高温度下可以为其析出提供大量的形核核心，这将干扰凝固过程中柱状晶的生长。此外，含锰钛氧化物还能促进奥氏体向晶内铁素体转变，从而在氧化物周围的钢焊缝中形成贫锰区。由此可见，直接在焊接熔池中加入纳米二氧化钛可以有效地控制相变，获得细小、良好的组织。
Nanosize TiO2 particles were added directly into welding molten pool through electrode for the difficulty of accurate control of oxygen potential and production processing parameters. The characteristics of phase transformation and thermal behavior of inclusions for Fe-C-Mn-Si-Ti-O system and Fe-C-Mn-Si-TiO2 system were analyzed. Results show that the added TiO2 particles are more helpful for the formation of Mn-Ti-O complex inclusion and can induce the decrease of phase transformation temperature of austenite to ferrite. Intragranular ferrite can be obtained under the condition of continuous cooling transformation with cooling rate of 293 K/s–373 K/s. The inclusions in steel welds are spherical in shape and mainly composed of TiO2, Ti3O5, Ti2O3, MnO, and SiO2. The mean size of inclusions is 0.67 μm. These complex inclusions can supply a large number of nucleating cores for their precipitation at higher temperature, which will disturb the growth of columnar crystal during solidification. Moreover, Mn-containing titanium oxides will promote the transformation of austenite to intragranular ferrite for the formation of manganese depleted zones in steel welds around oxides. So it can be concluded that nanosize titanium oxide added directly in welding molten pool can be effectively used to control phase transformation and achieve fine and favorable microstructure.
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影响因子：
1.5
作者：
J. Shields
通讯作者：
J. Shields
影响因子：
1.8
作者：
Hiroki Goto;K. Miyazawa;Kazuaki Tanaka
通讯作者：
Hiroki Goto;K. Miyazawa;Kazuaki Tanaka
影响因子：
2.2
作者：
Z. Yang;Fuming Wang;Sen Wang;B. Song
通讯作者：
Z. Yang;Fuming Wang;Sen Wang;B. Song
影响因子：
9.4
作者：
Shim, JH;Cho, YW;Lee, DN
通讯作者：
Lee, DN
DOI：
10.1016/s1005-8850(07)60004-8
发表时间：
2007-02
期刊：
Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material
影响因子：
--
作者：
Xiao-jun Zhuo;Xinhua Wang;Wan-jun Wang;Lee Hae-geon
通讯作者：
Xiao-jun Zhuo;Xinhua Wang;Wan-jun Wang;Lee Hae-geon