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首页> 外文期刊>Corrosion Engineering, Science and Technology >High temperature oxidation mechanism of a 3 percent Ni cast stainless steel
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High temperature oxidation mechanism of a 3 percent Ni cast stainless steel

机译：3％镍铸不锈钢的高温氧化机理

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摘要

In this work, the high temperature oxidation mechanism of a high chromium (28 wt-percent) cast stainless steel containing 3 percent Ni, and with an austenitic-ferritic microstructure, has been studied and compared to that of aferritic stainless steel with similar chromium and carbon contents but without any nickel additions. Two different oxidation temperatures (800 and 970 deg C) were selected for both the as cast and annealed (600 deg C for 2200 h) conditions. The oxidation mechanism of the Ni-containing duplex alloy has been found to involve the ' formation of four successive layers: (i) the external scale exhibiting the crystalline structure of Cr_2O_3 (ii) a single phase metal layer in contact with the oxide and consisting of austenite (iii) a decarburised zone exhibiting a two phase structure of ferrite and austenite (iv) the initial alloy microstructure consisting of ferrite, austenite and alloy carbides. The oxidation resistance of the austenitic-ferritic alloy is in all cases 50-100 percent higher than that of the ferritic alloy, while that of the annealed samples (all other experimental conditions remaining constant) is ten times higher than that of the as cast samples.
机译：在这项工作中，已经研究了含有3％Ni且具有奥氏体-铁素体显微组织的高铬（28 wt％）铸造不锈钢的高温氧化机理，并将其与类似铬和碳含量，但不添加任何镍。对于铸态和退火态（600摄氏度，持续2200小时），选择了两种不同的氧化温度（800和970摄氏度）。已发现含Ni的双相合金的氧化机理涉及'形成四个连续层：（i）表现出Cr_2O_3晶体结构的外部氧化皮（ii）与氧化物接触并由下列成分组成的单相金属层：奥氏体（iii）的脱碳区呈现出铁素体和奥氏体的两相结构（iv）初始合金微观结构由铁素体，奥氏体和合金碳化物组成。在所有情况下，奥氏体-铁素体合金的抗氧化性均比铁素体合金高50-100％，而退火样品（所有其他实验条件保持不变）的抗氧化性比铸态样品高十倍。 。

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