Modeling of growth stress gradient effect on the oxidation rate at high temperature

作     者：Fan YANG Bin LIU Dai-ning FANG 

作者机构：Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Beijing 100084 China State Key Laboratory for Turbulence and Complex Systems College of Engineering Peking University Beijing 100871 China 

出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)

年 卷 期：2010年第11卷第10期

页      面：789-793页

核心收录：

学科分类：0810[工学-信息与通信工程] 080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Project supported by the National Basic Research Program (973) of China (No 90505015) the National Natural Science Foundation of China (Nos 90816006 and 10732050) 

主　　题：氧化速率 应力梯度 高温氧化 生长应变 效应模型 反应动力学模型 抛物线规律 反应速度 

摘      要：A new oxidation kinetics model is established for high-temperature oxidation. We assume that the interface reaction is fast enough and the oxidation rate is controlled by diffusion process at high temperature. By introducing the growth stress gradient we modify the classical oxidation parabolic law. The modified factor of the oxidation rate constant is a function of growth strain, environment oxygen concentration, and temperature. The modeling results show that the stress gradient effect on the oxidation rate cannot be ignored. Growth strain will dominate whether the stress gradient effect promotes or slows down the oxidation process. The stress gradient effect becomes weaker at higher temperature. This effect is amplified at higher concentrations of environmental oxygen. Applied mechanical loads do not affect the oxidation rate. This model is available for high temperature oxidation of metals and alloys.