2.25Cr1Mo鋼溶接継手部のクリープ損傷予測と超音波ノイズ分析による損傷評価

概要

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For evaluating the creep damage of 2.25Cr1Mo steel(JIS STPA24)welded joint, degradation mechanism and non-destructive analytical methods(Ultrasonic test noise analysis methods:UT noise analysis)were studied on the welded joint creep specimens interrupted at various test periods. Degradation of the heat affected zone(HAZ) prior to the base metal degradation was calculated from the simplified computation formulae simulating the stress relaxation curve. Creep void formation was remarkable in the middle of HAZ of the specimen, rather than near the surface, followed by the formation of linkage called Type IV cracking. UT noise analysis method, especially effective for detecting fine defects, could be used to measure the degradation of the welded joint HAZ. The measured results of welded joint in fossil power plant indicated the usefulness of UT noise analysis method.
社団法人日本材料学会の論文
1996-03-15