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High strength-superplasticity combination of ultrafine-grained ferritic steel:The significant role of nanoscale carbides

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Journal of Materials Science & Technology 2021年第24期83卷 131-144页

作者： J.W.Liang Y.F.Shen R.D.K.Misra P.K.Liaw Key Laboratory for Anisotropy and Texture of Materials(MOE) School of Materials Science and EngineeringNortheastern UniversityShenyang110004China The State Key Lab of Rolling&Automation Northeastern UniversityShenyang110819China Laboratory for Excellence in Advanced Steel Research University of Texas at El PasoTX79968USA Department of Materials Science and Engineering University of TennesseeKnoxvilleTN37996USA

There is currently a gap in our understanding of mechanisms that contribute to high strength and high plasticity in high strength UFG ferritic steel with nano-size Fe3 C carbides in situations that involve combination of various strain rates and high *** this regard,we describe the mechanistic basis of obtaining high strength-high plasticity combination in an ultrafine-grained(UFG)(~500±30 nm)ferritic steel with nano-size carbides,which sustained large plastic deformation,exceeding 100%elongation at a temperature significantly below 0.5 of the absolute melting point(Tm).To address the missing gap in our knowledge,we conducted a series of experiments involving combination of strain rate and temperature effects in conjunction with electron microscopy and atom probe tomography(APT).Strain rate studies were carried out at strain rates in the range of 0.0017-0.17 s^(-1)and at different temperatures from 25℃to 600℃.Dynamic recrystallization occurred at 600℃,resulting in a significant decrease in yield and tensile ***,the UFG ferritic steels had an advantage in tensile strength(UTS)and elongation-to-failure(εf)at 600℃,especially at strain rate of 0.0017 s^(-1),with high UTSof 510 MPa and excellent low temperature(superplasticity(εf=110%).These mechanical properties are significantly superior compared to similar type of steels at identical temperature.A mechanistic understanding of mechanical behavior of UFG ferritic steels is presented by combining the effect of strain rate,temperature,and nano-size carbides.

关键词： UFG ferritic steel Strain rate temperature Nano-size precipitate low temperature superplasticity

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Superplastic Properties of Al_2O_3/Ni-Mn Nanocomposite Fabricated by Electrodeposition

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Journal of Materials Science & Technology 2010年第7期26卷 625-628页

作者： Guofeng Wang Kaifeng Zhang National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Harbin 150001 China

Ni-Mn nanocomposite reinforced by Al2O3 particles was fabricated by pulse electrodeposition. The average grain size is 60 nm and the content of Mn and Al2O3 particles is 0.3 and 0.6 wt pct, respectively. The superplastic deformation behavior was further studied at the temperatures ranging from 673 to 873 K. A maximum elongation of 530% is obtained in the tension test at a temperature of 773 K and at a strain rate of 1.67×10^-3 s^-1. The curves of the flow stress vs strain rate have features similar to the trend of conventional superplastic materials. The test temperature （773 K） equals to 0.35Tin, which means the material obtains low temperature superplasticity. The microstructures of the composite were examined and grain growth was observed during deformation.

关键词： Electrodeposition Nanocomposites low temperature superplasticity Microstructure

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