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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2020.1
- 수록면
- 14 - 24 (11page)
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In this study, variations in the tensile behavior and Bauschinger effect with the applied loading direction in an AmericanPetroleum Institute (API) X70 steel sheet are investigated by conducting tensile and strain-reversal tests along the rollingdirection (RD), the transverse direction (TD), and a direction inclined at an angle of 45° from the RD to the TD (45D). Themicrostructure of the rolled steel sheet consists of polygonal ferrite and acicular ferrite, and it has a rolling texture that istypical of body-centered cubic metal materials. During tensile deformation, the yield-point phenomenon, which involvesoccurrence of discontinuous yielding and development of Lüders strain, occurs in all the loading directions. However, thematerial shows a lower yield strength and larger Lüders strain under tension along the 45D than under tension along the RDand TD. The Bauschinger effect, which occurs under subsequent reversal tension after compression, is also more pronouncedunder loading along the 45D. These results are attributed to the fact that dislocation slips are activated more easily underdeformation along the 45D, which is evidenced by the lower Taylor factor and larger number of active slip systems underloading along the 45D. Furthermore, results of viscoplastic self-consistent simulation reveal that along all the directions, the{112} < 111 > slip system is vigorously activated during tensile and compressive deformations and that its activation playsan important role in the deformation behavior and yield strength of the material.
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