Evolution of microstructure and properties of internal nitride dispersion strengthened alloy before nitriding |
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Authors: | JU Quan ZHANG Yong- lu TONG Jin- tao MA Hui- ping |
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Affiliation: | 1.High Temperature Materials Institute, Central Iron and Steel Research Institute, Beijing 100081, China ;2. Beijing Key Laboratory of Advanced High Temperature Materials, Beijing 100081, China?? |
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Abstract: | Internal nitride dispersion strengthened superalloy is a new type of high performance superalloy for combustion chamber. The background and development of this alloy were firstly introduced. And then the microstructure and properties of NS163 which is a typical internal nitride dispersion strengthened alloy were investigated. The results show that the microstructure of NS163 is simple in the temperature range of 900??1250??, which is composed of austenite matrix and MC carbide. The recrystallization behavior of the cold- rolled sheet under the test condition was studied systematically. It is found that the solid solution temperature of the finished product should be 1200??, and after solid solution at 1200??, the sheet has 5 grade average grain size, excellent cold workability and low tensile strength at high temperature. The above results can help to optimize the microstructure of NS163 alloy sheet before nitriding and provide a basis for the evaluation of the strengthening effect of the alloy after internal nitriding. |
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Keywords: | recrystallization internal nitride superalloy combustion chamber |
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