Small punch tests to estimate the mechanical properties of steels for steam power plant: I. Mechanical strength

摘要

Small punch test techniques have been used to evaluate the mechanical properties of componentsfrom miniature-sized specimens. Correlations between mechanical characteristics determined fromsmall punch tests and uniaxial tensile tests have been obtained on low alloy steels. Analyticalformulations, with an appropriate description of the uniaxial stress-strain behavior, have been used tomodel the elastic bending, plastic bending and membrane stretching regimes of small punch load-deflection curves. These equations have been applied to austenitic 12Cr- 1Mo steel in the temperaturerange 25-600℃, and have been verified on ferritic 1Cr-0.5Mo steel at ambient temperature. Theseformulations have also been used to estimate the uniaxial tensile stress-strain behavior of ferritic2.25Cr- 1Mo and AISI 403 steels from experimental small punch load-deflection curves.