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首页> 外文会议>2003 ASME(American Society of Mechanical Engineers) Turbo Expo; Jun 16-19, 2003; Atlanta, Georgia >FACTORS AFFECTING CORROSION RESISTANCE OF RECUPERATOR ALLOYS
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FACTORS AFFECTING CORROSION RESISTANCE OF RECUPERATOR ALLOYS

机译：影响再生合金耐蚀性的因素

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摘要

As microturbine recuperators are needed to operate at higher temperatures in order to achieve higher engine operating efficiencies, a recurring problem encountered is a severe degradation in environmental resistance of type 347 stainless steel. Above 600℃, stainless steels can experience accelerated attack caused by water vapor, which is often present as a combustion product. Nickel-base alloys are less susceptible to this accelerated attack but their cost is prohibitive. In order to provide a clear, fundamental understanding of alloy composition effects on corrosion resistance of stainless steel components used in recuperators, the oxidation behavior of model alloys is being studied. A composition range of Cr and Ni contents has been identified with better corrosion resistance than type 347 stainless steel. Finer-grained alloys showed improved corrosion resistance compared to coarse-grained alloys with the same composition. It also has been demonstrated that minor alloy additions of Mn and Si are beneficial to corrosion resistance in these environments. This type of information will aid in the development of a corrosion-resistant and cost-effective recuperator material for operation at 650°-700℃.
机译：由于需要微型涡轮换热器在更高的温度下运行以实现更高的发动机运行效率，因此反复出现的问题是347型不锈钢的耐环境性严重降低。高于600℃，不锈钢会因水蒸气而加速腐蚀，而水蒸气通常作为燃烧产物存在。镍基合金不太容易受到这种加速侵蚀的影响，但其成本高得令人望而却步。为了清楚，基本地了解合金成分对换热器中使用的不锈钢组件的耐腐蚀性的影响，正在研究模型合金的氧化行为。已确定Cr和Ni的成分范围比347型不锈钢具有更好的耐腐蚀性。与具有相同成分的粗晶粒合金相比，细晶粒合金显示出更高的耐腐蚀性。还已经证明，在这些环境中添加少量的Mn和Si合金有助于提高抗腐蚀性。此类信息将有助于开发一种耐腐蚀且具有成本效益的换热器材料，以便在650°-700℃下运行。

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