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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.5; Jul 7-11, 2003; Leganes, Madrid, Spain >OXIDATION BEHAVIOUR AT HIGH TEMPERATURE OF FERRITIC STAINLESS STEELS MANUFACTURED BY POWDER METALLURGY
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OXIDATION BEHAVIOUR AT HIGH TEMPERATURE OF FERRITIC STAINLESS STEELS MANUFACTURED BY POWDER METALLURGY

机译：粉末冶金法制备的铁素体不锈钢在高温下的氧化行为

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摘要

High-temperature oxidation behaviour was studied for two ferritic stainless steels manufactured by powder metallurgy (P/M): AISI 409 Nb and AISI 434L. These steels find application in the manufacture of components exposed to high temperature in the automobile industry (exhaust pipes) and turbocompressors. Both steels were compacted at 700 MPa and sintered in vacuum at three different temperatures (1225, 1250 and 1275℃). In this way, materials with different densities were obtained and, therefore, with different properties associated to this magnitude. Dimensional change was evaluated. A complete microstructural study was carried out, evaluating also porosity. Oxidation rate was measured by mass gain in an isothermal experiment in air atmosphere at 800℃ for 48 hours. The oxidized samples were studied by X-ray diffraction and scanning electron microscopy to determine the influence of sintering temperature in the nature and structure of the scales. Obtained results make possible to see the important influence that the composition of the metal base and the porosity have in the oxidation behaviour at high temperatures of stainless steels manufactured by P/M.
机译：研究了两种通过粉末冶金（P / M）制造的铁素体不锈钢的高温氧化行为：AISI 409 Nb和AISI 434L。这些钢可用于汽车行业（排气管）和涡轮压缩机中暴露于高温的零部件的制造中。两种钢均在700 MPa下压实，并在三种不同温度（1225、1250和1275℃）下真空烧结。以这种方式，获得了具有不同密度的材料，因此具有与该幅度相关的不同特性。评估尺寸变化。进行了完整的微观结构研究，还评估了孔隙率。氧化速率是通过在空气中在800℃下进行48小时的等温实验中通过质量增加来测量的。通过X射线衍射和扫描电子显微镜对氧化后的样品进行研究，以确定烧结温度对水垢性质和结构的影响。所获得的结果使得有可能看到金属基质的组成和孔隙率对由P / M生产的不锈钢在高温下的氧化行为的重要影响。

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