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| 1 | Effect of Titanium Content on Microstructure and Wear Resistance of Hardfacing Alloy显示文摘The hardfacing alloys with different concentrations of titanium were deposited on carbon steel substrates by shielded metal arc welding, and the effect of titanium content on the microstructure characteristics of the hardfacing alloys was investigated. The wear resistance test of the hardfacing alloys was carried out by using a slurry rubber wheel abrasion test machine, and the wear behaviour was also studied. The results indicate that the addition of titanium can effectively promote the precipitation of the complex carbides of Nb and Ti due to the prior precipitation of titanium carbide which acts as nucleation sites for complex carbides. With the increase of titanium content, the wear resistance of the hardfacing alloys is increased gradually resulting from the refinement of microstructure and dispersive distribution of fine carbide precipitates. And the wear mechanism is mainly minimum plastic deformation with interrupted grooves due to the strengthening and protecting effects of carbide precipitates. | 杨可 JIANG Yongfeng BAO Yefeng | 2018 | Journal of Wuhan University of Technology(Materials Science)2018，33，3： | 5 |
| 2 | Microstructure and Corrosion Resistance of Arc Additive Manufactured 316L Stainless Steel显示文摘The gas tungsten arc welding based additive manufacturing (GTAW-AM) was carried out by printing 316L austenitic stainless steel on carbon steel substrate with different arc currents (140,160,180 A).Microstructure and corrosion resistance of additive manufactured components were investigated.The results show that the microstructure of the GTAW-AM austenitic stainless steel is obviously changed by the arc current.With arc current increasing from 140 to 180 A,the austenite grains become coarse due to the effect of welding heat input.Meanwhile,the quantity of ferrites in the austenite matrix is decreased and the morphology transforms from lath to skeleton.Moreover,σ phases are finally formed under the arc currents of 180 A owing to high welding heat input.Therefore,as the microstructure transform into coarse-grained austenites,low-quantity ferrites and new-generated σ phases,the GTAW-AM austenitic stainless steel presents a significantly decrease in corrosion resistance.And the reduction of corrosion resistance is mainly due to the formation of σ phase as a result from consuming the large amounts of Cr element from the matrix. | 杨可 WANG Qiuyu QU Yang JIANG Yongfeng BAO Yefeng | 2020 | Journal of Wuhan University of Technology(Materials Science)2020，35，5： | 2 |
| 3 | Effects of AlCoCrFeNiTi high-entropy alloy on microstructure and mechanical properties of pure aluminum显示文摘A new kind of AlCoCrFeNiTi high-entropy alloy(HEA)as a grain refiner was prepared by vacuum arc melting.In this work,the effects of HEA(1.0 wt.%,2.0 wt.%and 3.0 wt.%)on the microstructure and mechanical properties of pure aluminum were studied.The microstructure was characterized and examined by scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD),electron probe micro-analyzer(EPMA)and transmission electron microscopy(TEM)to indicate the refining abilities and mechanism of HEA on pure aluminum.Results show that the addition of HEA refined both the macrostructure and microstructure of pure aluminum.When 1.0 wt.%HEA was added,most coarse columnar grains were refined into equiaxed crystals,and as the amount of HEA increased to 2.0 wt.%and3.0 wt.%,aluminum grains were further refined,and the grain boundaries were nearly indistinguishable.Moreover,the morphology ofα-Al transformed from coarse columnar crystals to equiaxed grains,and the mean size ofα-Al grains decreased from 374μm to 27μm.The Al3Ti,Al3Ni,and nano-phase precipitated from the aluminum alloy with HEA in the solidification.The typical rod-like nano-phases distributed interdendritic regions ofα-Al.The average length of nano-phases is 2568 nm,4372 nm,and 6907 nm and the average diameter is 112 nm,103 nm,and 92 nm when 1.0 wt.%,2.0 wt.%and 3.0 wt.%HEA were added to the pure aluminum,respectively.The ultimate tensile strength(UTS)and yield strength(YS)were improved in all samples,whereas the elongation(El)was decreased with increasing HEA concentration.When 3.0 wt.%HEA was added into the aluminum melt,the UTS was improved by 145.2%from62 MPa to 152 MPa,the YS was increased by 173.8%from 42 MPa to 115 MPa,and the El was decreased by 33.3%from 39%to 26%. | Qinglin Li Shang Zhao Xuepeng Bao Yushi Zhang Yuqian Zhu Chuangzao Wang Yefeng Lan Yuxin Zhang Tiandong Xia | 2020 | Journal of Materials Science & Technology2020，52，17： | 2 |
| 4 | Surface Passivation and Energetic Modification Suppress Nonradiative Recombination in Perovskite Solar Cells显示文摘Surface passivation via post-treatment is an important strategy for improving power conversion efficiency and operational stability of perovskite solar cells.However,so far the interaction mechanisms between passivating additive and perovskite are not well understood.Here,we report the atomic-scale interaction of surface passivating additive 2,2-difluoroethylammonium bromine(2FEABr)on the MAPbI_(3).It is found that the bulky 2FEA+cations tend to distribute at film surface,while the Br−anions diffuse from surface into bulk.A combination of 19F,207Pb,and 2H solid-state NMR further reveal the Br−anions’partial substitution for the I−sites,the restricted motion of partial MA+cations,and the firmed perovskite lattices,which would improve charge transport and stability of the perovskite films.Optical spectroscopy and ultraviolet photoelectron spectroscopy demonstrate that the 2FEABr induced surface passivation and energetic modification suppress the nonradiative recombination loss.These findings enable the efficiency of the p-i-n structured PSC significantly increasing from 19.44 to 21.06%,accompanied by excellent stability.Our work further establishes more knowledge link between passivating additive and PSC performance. | Wei Dong Wencheng Qiao Shaobing Xiong Jianming Yang Xuelu Wang Liming Ding Yefeng Yao Qinye Bao | 2022 | Nano-Micro Letters2022，14，7： | 2 |
| 5 | High-temperature Tensile Behavior of Laser Welded Ti-22Al-25Nb Joints at Different Temperatures显示文摘The high-temperature tensile behavior of laser welded Ti-22Al-25Nb (at%) joints was investigated at 500,650,800,and 1 000 ℃.The temperatures for tensile tests were selected according to the phase transformation sequence of Ti2AlNb-based alloys.At temperatures lower than the B2+O phase field (500 ℃) and higher than the B2+O phase field (1 000 ℃),the joints fracture in the base metal in ductile fracture mode.By contrast,the joints exhibit obvious high-temperature brittleness in the B2+O phase field (650 °C and 800 ℃).Heat treatments were conducted with respect to the thermal history of tensile specimens.Intergranular microcracks along the grain boundary of B2 phase are found in the fusion zone after the heat treatments at 650 ℃ and 800 ℃.The high-temperature brittleness at 650 ℃ and 800 ℃ is attributed to the B2→O transformation along the grain boundary.The stress concentration caused by the volume change of B2→O transformation also contributes to the high-temperature brittleness of laser welded Ti-22Al-25Nb joints. | 张可召 雷正龙 CHEN Yanbin YAN Chunyan FU Qiang BAO Yefeng | 2020 | Journal of Wuhan University of Technology(Materials Science)2020，35，6： | 1 |
| 6 | Sliding wear behaviour of plasma electrolytic oxidation coating on pure aluminium显示文摘 | Yongfeng Jiang Yingyue Zhang Yefeng Bao Ke Yang | 2011 | Wear2011，，9： | 1 |
| 7 | Microstruc- ture and mechanical properties of 6063 aluminum alloy brazed joints with A1-Si-Cu-Ni-RE filler metal 显示文摘 | Zhang Guowei Bao Yefeng Jiang Yongfeng | 2011 | Journal of Materials Engineering and Performance2011，20，8： | 1 |
| 8 | The Effects of WC on the Microstructures and Wear Resistance of FeCoCrNiB_(0.2) High Entropy Alloy显示文摘To improve the wear resistance of the FeCoCrNiB_(0.2)high entropy alloy(HEA),the FeCoCrNiB_(0.2)(WC_(0))and FeCoCrNiB_(0.2)+20wt%WC(WC_(20))HEA coatings were prepared on Q235 steel by laser cladding(LC).The microstructure,hardness,and tribometer of the HEA coatings were investigated using scanning electron microscopy with spectroscopy(SEM/EDS),X-ray diffraction(XRD),vickers microhardness tester,and pin-on-disc tribometer,respectively.The experimental results show that the WC0HEA coating comprises a simple BCC phase mixed with an M_(2)B phase.Adding 20wt%WC,the WC_(20)HEA coating is composed of a simple BCC phase mixed with the Cr_(23)C_(6)carbide phase.The microstructure of the WC_(20)HEA coating is simple,which consists of equiaxed grain and dendritic.The microhardness also increases from 625.5HV to 806.0HV,and the wear mass loss correspondingly decreases from 30.9 to 14.9 mg.W and C atoms formed by WC dissolution are mainly dissolved in the BCC phase,which leads to the solution strengthening effect.Besides,Cr_(23)C_(6)carbides inhibit the growth of the grains,play the role of fine-grain strengthening,and further improve the hardness and wear resistance of the HEA coating. | BAO Yefeng GUO Linpo ZHONG Chonghui XIE Bingqi WANG Zirui SONG Qining JIANG Yongfeng | 2023 | Journal of Wuhan University of Technology(Materials Science)2023，38，2： | 0 |
| 9 | Improvement of Microstructure and Mechanical Properties of Rapid Cooling Friction Stir-welded A1050 Pure Aluminum显示文摘Two-mm thick A1050 pure aluminum plates were successfully joined by conventional and rapid cooling friction stir welding(FSW), respectively. The microstructure and mechanical properties of the welded joints were investigated by electron backscatter diffraction characterization, Vickers hardness measurements, and tensile testing. The results showed that liquid CO_(2) coolant significantly reduced the peak temperature and increased the cooling rate, so the rapidly cooled FSW joint exhibited fine grains with a large number of dislocations. The grain refinement mechanism of the FSW A1050 pure aluminum joint was primarily attributed to the combined effects of continuous dynamic recrystallization, grain subdivision, and geometric dynamic recrystallization. Compared with conventional FSW, the yield strength, ultimate tensile strength, and fracture elongation of rapidly cooled FSW joint were significantly enhanced, and the welding efficiency was increased from 80% to 93%. The enhanced mechanical properties and improved synergy of strength and ductility were obtained due to the increased dislocation density and remarkable grain refinement. The wear of the tool can produce several WC particles retained in the joint, and the contribution of second phase strengthening to the enhanced strength should not be ignored. | 许楠 LIU Lutao SONG Qining ZHAO Jianhua BAO Yefeng | 2024 | Journal of Wuhan University of Technology(Materials Science)2024，39，1： | 0 |
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