Oxidation Induced Stresses in High-Temperature Oxidation of Steel: A Multiphase Field Study
Oxidation Induced Stresses in High-Temperature Oxidation of Steel: A Multiphase Field Study
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DOI：
10.3390/met10060801
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发表时间：
2020-06
期刊：
影响因子：
2.9
通讯作者：
Alireza Toghraee;M. A. Zaeem
中科院分区：
文献类型：
--
作者：
Alireza Toghraee;M. A. Zaeem
用多相场模型研究了钢高温氧化过程中氧化物的生长和诱导应力。该模型结合了化学能和弹性能来捕获耦合的氧化物动力学和产生的应力。在850 °C和1180 °C两个高温下，研究了平面和尖角的氧化，考察了几何形状和温度升高对氧化物形状演变和诱导应力的影响。结果表明，该模型能够捕捉到氧化层厚度及其向外生长，与实验相当。此外，它表明，有氧化物的演变和所产生的应力之间的相互作用，和氧化物层的演变，以减少应力集中，通过圆化的几何形状中的尖角。提高温度可以增加或降低应力水平，这取决于本征应变在氧化期间产生的弹性应变能中的贡献。
Oxide growth and the induced stresses in the high-temperature oxidation of steel were studied by a multiphase field model. The model incorporates both chemical and elastic energy to capture the coupled oxide kinetics and generated stresses. Oxidation of a flat surface and a sharp corner are considered at two high temperatures of 850 °C and 1180 °C to investigate the effects of geometry and temperature elevation on the shape evolution of oxides and the induced stresses. Results show that the model is capable of capturing the oxide thickness and its outward growth, comparable to the experiments. In addition, it was shown that there is an interaction between the evolution of oxide and the generated stresses, and the oxide layer evolves to reduce stress concentrations by rounding the sharp corners in the geometry. Increasing the temperature may increase or decrease the stress levels depending on the contribution of eigen strain in the generated elastic strain energy during oxidation.