2 1/4Cr-1Mo鋼のクリープき裂成長挙動の評価

概要

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Creep crack growth behavior of 2 1/4 Cr-1 Mo steel at 550C was investigated by energy rate line integral, C*under conventional constant load control and deflection rate control. The same relation Ship of da/dt versus C*-integral was obtained by both of the control methods. The increasing deflection rate control test proposed in this paper was found to be a very efficient method because a wide range of creep crack growth data can be obtained stably on a single specimen. Various formulae to experimentally determine C*一integral of CT specimens were compared. Equation (3) considering the axial force as well as the bending effect agreed with the analytical results by the finiteelement method in the range Of a/W≧0.5. The result of C*-intergral estimation using the fully plastic solution, agreed with the experimental results in steady state creep conditions, when the plane strain solution was applied. Although the C*-integral approach with the fully plastic solution seems prospective for practical creep crack growth prediction, more investigations are needed various conditions.
社団法人日本材料学会の論文
1986-03-15