Creep rupture properties of heat resistant alloys with carbide or carbide and gamma prime precipitates were investigated in the temperature range from 900 degree C to 1050 degree C in He and reducing gas atmospheres. The degradation of the rupture strengths took place in the alloys, which have carbide as a strengthener, due to decarburization in He atmosphere at temperature higher than 1000 degree C. In the alloy which was strengthened mainly by gamma prime , the dissolution of gamma prime led to the degradation of the rupture strengths, but to the restoration of the rupture ductilities in greater extent. A new method to predict the rupture life, steady state creep rate, etc. from 0. 2% proof stress was proposed. In most cases, the method was found to be satisfactory in the sense that it represents the degradation behavior of the alloys according to various causes.
|Number of pages||8|
|Journal||Transactions of National Research Institute for Metals (Tokyo)|
|Publication status||Published - 1985 Dec 1|
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