Development of an Advanced Ultrahigh Strength TRIP Steel and Evaluation of Its Unique Strain Hardening Behavior

N. Saeidi; M. Jafari; J. G. Kim; F. Ashrafizadeh; H. S. Kim

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자료유형: 학술저널

저자정보: N. Saeidi (Isfahan University of Technology) M. Jafari (Isfahan University of Technology) J. G. Kim (Pohang University of Science and Technology (POSTECH)) F. Ashrafizadeh (Isfahan University) H. S. Kim (Pohang University of Science and Technology (POSTECH))

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.2

발행연도: 2020.1

수록면: 168 - 178 (11page)

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A novel ferrite-53% austenite medium-Mn transformation induced plasticity (TRIP) steel with extraordinary combinationof 1420 MPa tensile strength and 27% elongation was produced by a simple designed thermomechanical treatment. Thedeformation and strain hardening behavior of this material were studied in detail using feld emission scanning electronmicroscopy and electron backscatter difraction examinations of diferent strained specimens. Exclusive strain hardeningbehavior observed in this new TRIP steel was found to be related to the severe grain refnement to less than 200 nm andaustenite grain disintegration within the frst 1% of applied strain. Moreover, it was shown that the deformation of highlyunstable retained austenite benefts the mechanical properties, since it could promote the severe grain refnement and subsequent uniform strain distribution within the microstructure of the TRIP steel. Finally, based on the strain hardening behavioranalysis a new and simple measurable criterion was introduced as a reliable replacement of traditional austenite stabilityparameter or the K value.

#Medium Mn TRIP steel · EBSD analysis · Strain hardening · Retained austenite stability · Nano scale grain size

참고문헌 (45)

참고문헌 신청

H. Lee / 2018 / Acta Mater 147:247~260

D. W. Suh / 2017 / Scr. Mater 126:63~67

N. Saeidi / 2017 / Mater. Sci. Eng. A 702:1~456

H. Song / 2017 / Acta Mater 135:215~225

Y. Bo Xu / 2017 / Mater. Sci. Eng. A 688:40~55

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