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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 >Low-Temperature and High-Temperature Corrosion Behaviour of Powder Metallurgical Duplex Stainless Steels
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Low-Temperature and High-Temperature Corrosion Behaviour of Powder Metallurgical Duplex Stainless Steels

机译：粉末冶金双相不锈钢的低温和高温腐蚀行为

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摘要

The porosity, that is inevitable in stainless steels manufactured by powder metallurgy (P/M), conditions their corrosion resistance and leads to notable differences between their behaviour and that of wrought stainless steels of similar composition. This work presents results about the corrosion behaviour at low and high-temperatures of three duplex stainless steels obtained from three different mixtures of prealloyed austenitic and ferritic powders (25%316L+75%434L, 50% 316L+50%434L and 75%316L+25%434L). Specimens manufactured from 100% 316L and 100% 434L powders were also studied for comparison. Polarization curves in 3.5% NaCl solutions at room-temperature demonstrate that the corrosion rate of these materials increases as the austenite content in the base metal decreases. The high-temperature corrosion behaviour was studied in exposures to air at 600, 750 and 900℃. Results prove that the concentration of Ni in the base metal greatly decreases the oxidation resistance of sintered stainless steels, because this element changes the chemical nature and affects the protective properties of the formed oxides.
机译：在粉末冶金（P / M）制造的不锈钢中不可避免的孔隙度限制了其耐腐蚀性，并导致其性能与相似成分的锻造不锈钢之间存在显着差异。这项工作介绍了三种由三种不同的预合金奥氏体和铁素体粉末混合物（25％316L + 75％434L，50％316L + 50％434L和75％316L）获得的三种双相不锈钢在低温和高温下的腐蚀行为的结果。 + 25％434L）。还对由100％316L和100％434L粉末制成的样品进行了比较。室温下在3.5％NaCl溶液中的极化曲线表明，这些材料的腐蚀速率随母材中奥氏体含量的降低而增加。研究了在600、750和900℃下暴露于空气中的高温腐蚀行为。结果证明，母金属中Ni的浓度大大降低了烧结不锈钢的抗氧化性，因为该元素改变了化学性质并影响了所形成的氧化物的保护性能。

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