Yongfeng Shen
Northeastern University (China)
Ultimate tensile strengthFerrite (iron)Deformation (engineering)Strain rateDislocationComposite materialMartensiteMetallurgyGrain sizeMaterials scienceDeformation mechanismAlloyElongationNanoscopic scaleGrain boundaryDuctilityVolume fractionCrystal twinningAnnealing (metallurgy)PlasticityMicrostructureAustenite
79Publications
24H-index
5,665Citations
Publications 66
Newest
#1Zhou Jinhua (Northeastern University (China))H-Index: 2
#2Yongfeng Shen (Northeastern University (China))H-Index: 24
Last. N. Jia (Northeastern University (China))H-Index: 15
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Abstract null null The static recrystallization and MX precipitation of a low activation martensitic (LAM) steel processed by different compression temperatures were studied. The result shows that at an identical duration of 200 s, the static recrystallization degree of steel decreases continuously from 96% to 62% and 25 % with decreasing compression temperature from 1050℃ to 950℃ and 850℃, respectively. Analysis shows that, with the decrease of compression temperature, the reduced recrystalliza...
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#1Zhao Zhanyong (North University of China)H-Index: 13
#2Ren-Guo Guan (Dalian Jiaotong University)H-Index: 13
Last. Peikang Bai (North University of China)H-Index: 15
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Abstract We elucidate the effect of lanthanum (La) on the grain refinement of Mg-3Sn-1Mn alloy during accumulative hot rolling. The lath-shaped Mg2Sn phase in the Mg-3Sn-1Mn alloy is firstly broken and spheroidized, and then the size increases and coarsens with the increase of rolling reduction, most of Mg2Sn move from grain boundary to grain and are homogeneously distributed within the matrix. However, the plate-shaped MgSnLa compound in Mg-3Sn-1Mn-1La gradually becomes fine, spheroidized, and ...
9 CitationsSource
#1Wen-ying Xue (Northeastern University (China))H-Index: 4
#2H.F. Zhang (MOE: Chinese Ministry of Education)
Last. Jia Nan (MOE: Chinese Ministry of Education)H-Index: 2
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Abstract null null A Fe-10.5Mn-0.06C steel consisting of austenite and ferrite dual phases with a volume fraction ratio of 7:3 was fabricated via the quenching and partitioning (Q&P) processing. Tensile tests at various temperatures and strain rates were performed to reveal the mechanical properties of the steel, and the deformation microstructures were characterized by using TEM, t-EBSD and APT techniques. At a constant strain rate of 0.1 s−1, yield strength, tensile strength increase as the te...
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#1Zhufeng He (NU: Northeastern University)H-Index: 2
#2N. Jia (MOE: Chinese Ministry of Education)H-Index: 15
Last. Yongfeng Shen (NU: Northeastern University)H-Index: 24
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Abstract High-entropy alloys (HEAs) have attracted great research interest owing to their good combination of high strength and ductility at both room and cryogenic temperatures. However, expensive raw materials are always added to overcome the strength-ductility trade-off at low temperatures, leading to an increased production cost for the cryogenically used alloys. In this work, a series of nitrogen-doped FeMnCoCr HEAs have been processed by homogenization annealing, cold rolling and recrystal...
3 CitationsSource
#1J.W. Liang (Northeastern University (China))H-Index: 1
#2Yongfeng Shen (NU: Northeastern University)H-Index: 24
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Abstract 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 Fe3C carbides in situations that involve combination of various strain rates and high temperature. In 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 deformat...
2 CitationsSource
#1Xiuping Dong (MOE: Chinese Ministry of Education)H-Index: 18
#2Sheng Liu (MOE: Chinese Ministry of Education)H-Index: 2
Last. N. Jia (MOE: Chinese Ministry of Education)H-Index: 15
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The determining significance of isothermal holding on microstructure and mechanical properties of a transformation-induced plasticity steel (Fe-1.67Mn-1.32Al-0.55Si-0.47C) was studied with multiple techniques including x-ray diffraction, scanning electron microscopy and transmission electron microscopy. The objective was to design an optimal isothermal holding treatment for medium-carbon TRIP steels with ultrahigh strength and high elongation. A critical analysis of the experimental observations...
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#1Jin-hua ZhouH-Index: 1
#2Yongfeng Shen (NU: Northeastern University)H-Index: 24
Last. Nan JiaH-Index: 1
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This review summarizes the strengthening mechanisms of reduced activation ferritic/martensitic (RAFM) steels. High-angle grain boundaries, subgrain boundaries, nano-sized M23C6, and MX carbide precipitates effectively hinder dislocation motion and increase high-temperature strength. M23C6 carbides are easily coarsened under high temperatures, thereby weakening their ability to block dislocations. Creep properties are improved through the reduction of M23C6 carbides. Thus, the loss of strength mu...
5 CitationsSource
#1Jian-Jun Wang (Northeastern University (China))H-Index: 10
#2Yongfeng Shen (NU: Northeastern University)H-Index: 24
Last. R.D.K. Misra (UTEP: University of Texas at El Paso)H-Index: 32
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Abstract The study of toughening mechanism associated with the heat-affected zone (HAZ) continues to be of significant interest for improving the low temperature (−40 °C) toughness. In this study, the effect of different heat input on microstructure, hardness and low temperature impact toughness of coarse-grained HAZ (CGHAZ) in a high-strength low-alloy (HSLA) plate steel was explored by using welding thermal simulations. After different welding thermal cycles with heat input of 60, 90, 120, and...
3 CitationsSource
#1X. X. Dong (NU: Northeastern University)H-Index: 1
#2Yongfeng Shen (NU: Northeastern University)H-Index: 24
Last. N. Jia (Northeastern University (China))H-Index: 15
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Abstract In this study, the microstructure and mechanical properties of the 0.56 wt. % C transformation-induced plasticity (TRIP) steel are investigated by conducting tensile tests at a wide span of deformation temperatures (25 – 400 °C) and strain rates (0.001 – 1 s-1). The target is to explore the stability of retained austenite (RA) at various temperatures and strain rates, and the influence of the RA stability on the TRIP effect. Tensile strength decreases with the increasing deformation tem...
1 CitationsSource
#1J.H. Zhou (NU: Northeastern University)H-Index: 2
#2Yongfeng Shen (NU: Northeastern University)H-Index: 24
Last. R.D.K. MisraH-Index: 32
view all 5 authors...
Abstract In sequel to our previous study (Mater. Sci. Eng. A, 769 (2020) 138,471), we elucidate here the determining role of alloying with Ti and tempering effect on tensile and creep properties in low activation martensitic steel (LAM) and compare with the coarse-grained (CG) LAM steel. When the tempering temperature was decreased from 760 °C to 730 °C, while maintaining time constant at 30 min, grain size and MX carbide density was constant at ~7.0 ± 0.5 μm and (8.20 ± 0.05) × 1024 m−3 in 0.1 ...
3 CitationsSource