Study on the High Temperature Oxidation of René 142 Directionally Solidified Superalloy
碩士 === 義守大學 === 機械與自動化工程學系碩士班 === 98 === High temperature oxidation resistance of turbine blade materials is very important, because turbine blades operated in the long-term high temperature condition can have spallations of surface protective coatings, in this case turbine blades need to rely on th...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/97453477822107989609 |
| Summary: | 碩士 === 義守大學 === 機械與自動化工程學系碩士班 === 98 === High temperature oxidation resistance of turbine blade materials is very important, because turbine blades operated in the long-term high temperature condition can have spallations of surface protective coatings, in this case turbine blades need to rely on the oxidation resistance of the material itself. In particular the recyclic oxidation of turbine blade materials is of particular importance to address the effect of thermal fatigue.
The objective of this research is to discuss the difference of the oxidation resistance between directional solidification and conventional cast of René 142 superalloy. Firstly, cyclic oxidation and isothermal oxidation tests have been conducted by observing mass change and oxide grow. In addition, an interrupted creep testpiece subjected to rejuvenation heat treatment has been tested for oxidation behaviour.
In summary, the oxidation resistance of directional solidified samples performed better than conventional cast of René 142 superalloy in the 1150℃ high temperature oxidation test. Oxides of directional solidification samples are more continuous and compact comparing to that of conventional cast. Oxide structure of René 142 superalloy consists of mainly Al2O3 and HfO2 with internal oxidations.
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