Prediction model of oxide film peeling-off of austenitic heat-resistant steel for ultra-supercritical power unit
A prediction model of oxide film peeling-off of austenitic heat-resistant steel for an ultra-supercritical power unit is provided. A double-layer oxide film is formed on the surface of the alloy during service; when the inner layer is FeCr2O4 and the outer layer is Fe3O4, and the ratio of the defect...
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| Main Authors | , , , , , |
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| Format | Patent |
| Language | Chinese English |
| Published |
11.01.2019
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| Subjects | |
| Online Access | Get full text |
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| Summary: | A prediction model of oxide film peeling-off of austenitic heat-resistant steel for an ultra-supercritical power unit is provided. A double-layer oxide film is formed on the surface of the alloy during service; when the inner layer is FeCr2O4 and the outer layer is Fe3O4, and the ratio of the defect spacing l to the size a of the double-layer oxide film satisfies the following conditions: 0.2 <= l/a <= 6, the peeling-off behavior of the oxide film under different thermal stresses can be predicted by the change curves of the critical temperature difference versus l/a. For the observation results of the size and the distribution of the interface defects of the material commonly used for the superheater/reheater of the 600-degree-of-freedom ultra-supercritical thermal power unit in the service process at present, the invention can predict the peeling-off behavior of the double-layer oxide film formed on the surface of the alloy.
超超临界火电机组用奥氏体耐热钢氧化膜剥落预测模型，合金在服役过程中表面形成双层氧化膜，内层为FeCrO及外层为FeO，并且双层氧化膜界面缺陷间距l与尺寸a之比满足如下条 |
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| Bibliography: | Application Number: CN201811269929 |