Effect of Small and Large Amounts of Prestrain at 295K on Tensile Properties at 77K of 304 Stainless Steel

概要

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Small amounts of prestrain at 295K (0.005<ε_<295><0.08) decrease the yield strength σ_<0.2> at 77K. When ε_<295>=0.01, σ_<0.2> is 〜60MPa lower than that with no prestrain. X-ray diffraction analysis showed that the decrease of σ_<0.2> is due to more formation of ε martensite just at and after yield in the prestrained specimen. Large amounts of prestrain (0.1<ε_<295><0.454) increase σ_<0.2> and cause the yield plateau of the load-elongation curve. The yield plateau is attributed to the existence of a transition zone (3-8mm long, depending on prestrain) in the gauge length, where deformation occurs and a burst of α martensite transformation takes place. The transition zone propagates through the gauge length during the yield plateau. An explanation is given for the surface upheaval in a machined flange which has been cryogenically serviced.
一般社団法人日本機械学会の論文
1992-07-15