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采用热力学方法对含钛合金焊丝钢中氧化铝和氧化钛夹杂物的形成进行了理论计算。利用扫描电镜对钢中夹杂物的性质进行了分析。结果表明:TiO2-Al2O3和Ti2O3-Al2O3竞争氧化反应的临界条件分别为[%Ti]/[%Al]4/3=84.49和[%Ti]/[%Al]=7.46;当[%Ti]/[%Al]4/3<84.49和[%Ti]/[%Al]<7.46时,钢中优先生成Al2O3,反之生成Ti2O3或TiO2。当钢中w(Alt)由0.036 0%降至0.004 6%,钢中夹杂由Al2O3向Al2O3.TiOx、TiOx型转变,与理论计算相符。通过控制钢中w(Alt)<0.005 0%和软吹工艺参数,可有效减少Al2O3夹杂数量,连浇炉数提高至6炉。
The formation of alumina and titanium oxide inclusions in titanium alloy wire steel was theoretically calculated by thermodynamic method. The properties of inclusions in steel were analyzed by scanning electron microscopy. The results show that the critical conditions for the competitive oxidation reaction between TiO2-Al2O3 and Ti2O3-Al2O3 are [% Ti] / [% Al] 4/3 = 84.49 and [% Ti] / [% Al] /[%Al]4/3<84.49 and [% Ti] / [% Al] <7.46, the steel preferentially forms Al2O3, and vice versa to form Ti2O3 or TiO2. When the w (Alt) in the steel decreased from 0.036 0% to 0.004 6%, the inclusions in the steel changed from Al 2 O 3 to Al 2 O 3 .TiOx and TiOx, which accorded with the theoretical calculation. By controlling the steel w (Alt) <0.005 0% and soft blowing process parameters, the amount of Al2O3 inclusions can be effectively reduced, and the number of continuous casting furnaces can be increased to 6 furnaces.