B-15 ガスタービン高温部品劣化診断へのスモールパンチ/スモールパンチクリープ試験の適用性について(材料・構造,一般講演)

概要

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For the purpose of remaining life and degradation assessment of metal parts subjected to elevated temperature and steady state loading, miniature sample creep tests are frequently conducted using test sample specimens taken from actual parts experiencing actual services. Some hot gas path parts in heavy duty gas turbines, particularly 1st stage buckets, contain complex cooling paths, and are difficult to provide test samples of sufficient dimensions. To address this need, smaller uni-axial creep test specimens and small disc specimens as more simpler alternative may be used for the destructive remaining life assessment. Small punch test at room temperature may also provide useful information for ductility changes. This article describes the status of test techniques, particularly standardization of the test method, for small punch creep tests together with some test examples using samples taken from disposed gas turbine blades, and implies some points to keep in mind in applying this technology to the degradation assessment of gas turbine hot gas path parts.
2010-10-20