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首页> 外文期刊>Revista de metalurgia >Carburization of austenitic and ferritic alloys in hydrocarbon environments at high temperature
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Carburization of austenitic and ferritic alloys in hydrocarbon environments at high temperature

机译：碳氢化合物环境中高温下奥氏体和铁素体合金的渗碳

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摘要

The technical and industrial aspects of high temperature corrosion of materials exposed to a variety of aggressive environments have significant importance. These environments include combustion product gases and hydrocarbon gases with low oxygen potentials and high carbon potentials. In the refinery and petrochemical industries, Austenitic and ferritic alloys are usually used for tubes in fired furnaces. The tempera tore range for exposure of austenitic alloys is 800-1100 deg C, and for ferritic alloys 500-700 deg C, with carbon activities a_c>1 in many cases. In both applications, the carburization process involves carbon (coke) deposition on the inner diameter, carbon absorption at the metal surface, diffusion of carbon inside the alloy, and precipitation and transformation carbides to a depth increasing with service. The overall kinetics of the internal carburization are approximately parabolic, controlled by carbon diffusion and carbide precipitation. Ferritic alloys exhibit gross but uniform carburization while non-uniform intragranular and grain-boundary carburization is observed in austenitic alloys.
机译：暴露于各种侵蚀性环境下的材料的高温腐蚀的技术和工业方面具有重要意义。这些环境包括具有低氧势和高碳势的燃烧产物气体和碳氢化合物气体。在炼油和石化工业中，奥氏体和铁素体合金通常用于燃烧炉中的管子。奥氏体合金的暴露温度范围为800-1100℃，铁素体合金的暴露温度范围为500-700℃，在许多情况下碳活度a_c> 1。在这两种应用中，渗碳过程都涉及在内径上沉积碳（焦炭），在金属表面吸收碳，在合金内部扩散碳以及随着使用时间的增加而析出和转变碳化物的深度。内部渗碳的整体动力学近似于抛物线，受碳扩散和碳化物沉淀的控制。铁素体合金表现出粗大但均匀的渗碳，而在奥氏体合金中观察到不均匀的晶粒内和晶界渗碳。

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