Favorable Modulation of Microstructural Constituents in Governing Low Temperature Toughness Induced Through a Three-Stage Cooling Trajectory

Y. Tian; X. N. Xu; Q. B. Ye; R. D. K. Misra; Z. D. Wang

doi:10.1007/s12540-020-00714-9

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자료유형: 학술저널

저자정보: Y. Tian (Northeastern University) X. N. Xu (Northeastern University) Q. B. Ye (Northeastern University) R. D. K. Misra (University of Texas at El Paso) Z. D. Wang (Northeastern University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10

발행연도: 2021.10

수록면: 4,152 - 4,167 (16page)

DOI: 10.1007/s12540-020-00714-9

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Low temperature toughness continues to be a major challenge and significant efforts are being made in this regard. Weaddress the challenge of scientific and technological gap through the design of a novel process involving a three-stage coolingtrajectory during thermo-mechanical controlled processing to process high strength low alloy heavy plates with highlow temperature toughness. Interestingly, in contrast to the conventional continuous cooling process, the three-stage coolingtrajectory enabled us to obtain a favorable acicular ferrite toughening enhancing microstructure. On the other hand, martensite?austenite islands were characterized by small dot morphology in the three-stage cooling trajectory that restrict cracknucleation and prevent debonding from the matrix. The low temperature impact toughness at ? 80 °C exceeded ~ 500% inrelation to the conventional process. The mechanism of formation of acicular ferrite and its impact on toughness is criticallyanalyzed experimentally via electron microscopy and electron back scattered diffraction analysis and theoretically discussedin the context of toughening and crack arresting mechanism.

#High strength steel plates #Thermo-mechanical controlled processing #Toughness #Microstructure

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참고문헌 신청

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H. J. Pan / 2017 / Microstructure evolution and enhanced performance of a novel Nb-Mo microalloyed medium Mn alloy fabricated by low-temperature rolling and warm stamping / Mater. Des 134:352~360

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