Effects of Temperature and Strain Rate on Tensile Properties in a Lean Duplex Stainless Steel

Abstract

緒言二相ステンレス鋼は，フェライト ・石丸 詠一朗3) ・髙橋 明彦3) Effects of Temperature and Strain Rate on Tensile Properties in a Lean Duplex Stainless SteelNoriyuki Tsuchida, Taiji KawahaTa, Eiichiro ishimaru and Akihiko TaKahashi Synopsis : Effects of temperature and strain rate on tensile properties in a lean duplex stainless steel S32101 were investigated. In the temperature dependence on tensile properties, the uniform elongation increased from 273 K to 283 K and indicated the maximum uniform elongation at 258 K.From the x-ray diffraction experiments in the S32101, austenite was transformed to stress-induced martensite at temperatures below 283 K. The stress-induced transformation behavior at 258 K, at which the maximum uniform elongation was obtained, had things in common with the case of metastable austenitic stainless steels. When the tensile properties were compared between the S32101 and the metastable austenitic stainless steels, the increase in the uniform elongation due to TRIP effect was almost the same. At low temperatures below about 250 K, the uniform elongations of the metastable austenitic steels were smaller than that of the S32101 because of the large amount of stress-induced martensite at small strains.

Influence of Martensite Fraction on Tensile Properties of Quenched and Partitioned (Q&P) Martensitic Stainless Steels

“…The schematic in Figure a represents the temperature dependence of tensile elongation in fully austenitic steels . The variation of tensile elongation in the three regimes delineated by vertical‐dashed lines is justified by the temperature dependence of deformation mechanisms, as described in the introduction section.…”

“…The schematic in Figure 9a represents the temperature dependence of tensile elongation in fully austenitic steels. [22,[32][33][34][35][36][75][76][77][78][79][80][81] The variation of tensile elongation in the three regimes delineated by vertical-dashed lines is justified by the temperature dependence of deformation mechanisms, as described in the introduction section. Alloy system [76] and compositional homogeneity of austenite [35] are among factors which determine the breadth of the elongation peak.…”