Evaluation of Stress-Strain Property Variation in API X65 Steel Weldment Using Advanced Indentation Technique(Mechanical Behavior of Materials 2)

概要

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The welded joint has a gradient of microstructure and mechanical properties from fusion line to the unaffected base metal. But, conventional mechanical tests, which require large specimen and complex testing sequences, have difficulties in evaluating the mechanical properties of local zones of the in-service pipeline. Therefore, a simple and non-destructive mechanical testing method using small specimen is needed. An advanced indentation test meets these requirements. The advanced indentation test measures indentation load and depth during indentation. Various mechanical properties related to deformation are evaluated through the quantification of indentation stress field and the analysis of the load-depth curve. In this study, we concerned with the variation of tensile properties within the weldment of API 5L X65 steel, generally used for natural gas pipeline. The macroscopic and microscopic change in tensile properties such as true stress-strain curve, yield and tensile strengths are evaluated using advanced indentation tests, and the results are discussed.
社団法人日本機械学会の論文
2001-10-20