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首页> 外文会议>International Symposium on High Temperature Corrosion and Protection of Materials pt.2; 20040516-21; Les Embiez(FR) >Oxidation Kinetics and Scale Spallation of Iron-Chromium Alloys with Different Titanium Contents
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Oxidation Kinetics and Scale Spallation of Iron-Chromium Alloys with Different Titanium Contents

机译：不同钛含量的铁铬合金的氧化动力学和尺度剥落

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摘要

The influence of 0.2 and 0.4 wt.% Ti additions in 17%Cr ferritic stainless steels was investigated between 850 and 1 050℃ in terms of isothermal and cyclic oxidation resistance in oxygen or air. In isothermal tests, titanium was shown to increase the parabolic rate constant of chromia scale formation. Activation energies measured on k_p were similar for 17Cr steel without Ti and 17Cr steel with 0.2%Ti. In the case of 0.4%Ti, a marked reduction of the activation energy was noted, probably due to a doping saturation effect. During cyclic oxidation tests, parabolic-type behavior was maintained at 850 and 950℃, but mass loss was observed at 1 050℃. Scale adhesion energy estimations using room temperature forced spallation by tensile loading in the SEM chamber revealed very high adhesion on the 0.4%Ti steel but much lower on the 0.2% and Ti-free steels. These results agreed with observed spallation after 150 oxidation cycles where spallation was shown to be markedly reduced at all temperatures for the highest Ti level. The size and repartition of the TiO_2 internal precipitates could explain the adhesion results.
机译：就在氧气或空气中的等温和循环抗氧化性而言，在850至1050℃之间研究了添加0.2和0.4 wt％的Ti对17％Cr铁素体不锈钢的影响。在等温测试中，钛显示出增加了氧化铬垢形成的抛物线速率常数。对于不含Ti的17Cr钢和含0.2％Ti的17Cr钢，在k_p上测得的活化能相似。在0.4％Ti的情况下，注意到活化能显着降低，这可能是由于掺杂饱和效应所致。在循环氧化试验中，抛物线型行为在850和950℃保持不变，但在1050℃观察到质量损失。使用室温强制剥落，通过在SEM室中进行拉伸载荷，对氧化皮的附着力进行估算，发现在0.4％Ti钢上的附着力非常高，而在0.2％Ti和不含Ti的钢上的附着力低得多。这些结果与在150次氧化循环后观察到的散裂相吻合，其中在最高Ti含量的所有温度下，散裂均被显着降低。 TiO_2内部沉淀物的大小和重新分配可以解释粘附结果。

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