Abstract
Flow curves of 15Kh2MFA, Sv 08Kh19N10G2B and 08Kh18N10T steels used for fabrication of WWER-440 nuclear reactor pressure vessel and core internals were obtained using the automated ball indentation (ABI) test technique and compared with flow curves evaluated from the same measured load-displacement data and widely used Oliver-Pharr method. Differences in results obtained by both studied methods do not exceed 12 % and are attributed to the amount of material pile-up.
Highlights
Perhaps the most important test of a material’s mechanical response is the tensile test
The instrumented spherical indentation was used for characterization of tensile properties of base metal (15Kh2MFA steel) and cladding (Sv 08Kh19N10G2B steel) of WWER-440 reactor pressure vessel and of main structural material of reactor core internals in two deformation states
The aim of the study was to evaluate true stress/strain curves of all studied materials and to compare two methods of their evaluation: more complex automated ball indentation (ABI) test iterative procedure proposed by Haggag and the relatively simple and available method of Oliver-Pharr mainly used for determination of elastic modulus and hardness of materials
Summary
Perhaps the most important test of a material’s mechanical response is the tensile test. For estimation of a stress-strain curve from indentation data, a spherical indenter has advantage among others with e.g. conical or pyramidal shapes. Contact angle of spherical indenter changes with loading (contrary to conical or pyramidal indenters), which allows determination of more than one point of the stress-strain curve. There are numerous models available to reduce the spherical indentation data to uniaxial stress-strain behavior of the test material They differ in the level of physical simplification and in the computational complexity The accuracy of such models relies substantially on proper determination of the contact area between the indenter and test material
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