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In the present study, the tensile properties and dynamic strain aging of an Fe-24.5Mn-4Cr-0.45C alloy were investigated in terms of strain rate. During tensile testing at room temperature, all the stress-strain curves exhibited serrated plastic flows related to dynamic strain aging, regardless of the strain rate. Serration appeared right after yield stress at lower strain rates, while it was hardly observed at high strain rates. On the other hand, strain-rate sensitivity, indicating a general relationship between flow stress and strain rate at constant strain and temperature, changed from positive to negative as the strain increased. The negative strain-rate sensitivity can be explained by the Portevin Le Chatelier effect, which is associated with dynamic strain aging and is dependent on the strain rate because it is very likely that the dynamic strain aging phenomenon in high-manganese steels is involved in the interaction between moving dislocations and point-defect complexes.
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참고문헌 (19)
참고문헌 신청
Y. N. Dastur / 1981 / Metall. Mater. Trans. A 12A:749
H. K. Yang / 2014 / Mater. Sci. Eng. A 607:551
Joong Eun Jung / 2014 / Temperature Effect on Twin Formation Kinetics and Deformation Behavior of Fe-18Mn-0.6C TWIP Stee / Metals and Materials International 20(1):27~34
Jung-Su Kim / 2014 / Effect of Deformation Induced Transformation of ε-Martensite on Ductility Enhancement in a Fe-12 Mn Steel at Cryogenic Temperatures / Metals and Materials International 20(1):41~47
Daeho Jeong / 2015 / Fatigue Crack Propagation Behavior of Fe24Mn Steel Weld at 298 and 110 K / Metals and Materials International 21(1):22~30
H. K. Yang / 2014 / Mater. Sci. Eng. A 607:551
Joong Eun Jung / 2014 / Temperature Effect on Twin Formation Kinetics and Deformation Behavior of Fe-18Mn-0.6C TWIP Stee / Metals and Materials International 20(1):27~34
Jung-Su Kim / 2014 / Effect of Deformation Induced Transformation of ε-Martensite on Ductility Enhancement in a Fe-12 Mn Steel at Cryogenic Temperatures / Metals and Materials International 20(1):41~47
Daeho Jeong / 2015 / Fatigue Crack Propagation Behavior of Fe24Mn Steel Weld at 298 and 110 K / Metals and Materials International 21(1):22~30
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