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| 1 | Effect of Yttrium Addition on Microstructural Characteristics and Superplastic Behavior of Friction Stir Processed ZK60 Alloy显示文摘As-extruded ZK60 and ZK60-Y magnesium alloy plates were successfully processed via friction stir processing(FSP) at a tool rotation rate of 1600 r/min and a traverse speed of 200 mm/min. FSP resulted in the formation of equiaxed recrystallized microstructures with the average grain sizes of w8.5 and w4.7 mm in the ZK60 and ZK60-Y alloys, respectively. Moreover, FSP broke and dispersed the MgZn2 and W-phase(Mg3 Zn3 Y2) particles and dissolved MgZn2 phase in the FSP ZK60 alloy. With the addition of rare earth element yttrium(Y) into the ZK60 alloy, the ratio of the high angle grain boundaries(HAGBs) in the FSP alloys increased from 64% to 90%, and a certain amount of twins appeared in the FSP ZK60-Y alloy. The maximum elongation of 1200% and optimum strain rate of 3 103s1achieved at 450 C in the FSP ZK60-Y alloy were substantially higher than those of the FSP ZK60 alloy. This is attributed to the fine grains with high ratio of HAGBs and the distribution of a large number of dispersed second phase particles with high thermal stability in the FSP ZK60-Y alloy. Grain boundary sliding was identified as the primary deformation mechanism in the FSP ZK60 and ZK60-Y alloys from the superplastic data analyses and surficial morphology observations. | Z.A.Luo G.M.Xie Z.Y.Ma G.L.Wang G.D.Wang | 2013 | Journal of Materials Science & Technology2013，29，12： | 9 |
| 2 | MECHANICAL STABILIZATION OF DEFORMED AUSTENITEDURING CONTINUOUS COOLING TRANSFORMATION IN AC-Mn-Cr-Ni-Mo PLASTIC DIE STEEL显示文摘The influence of prior austenite deformed at different temperature on the subsequent continuous cooling bainitic transformation has been investigated in an C-Ma-Cr-Ni-Mo plastic die steel. The results show that the prior deformation in low temperature region of austenite retards significantly the bainitic transformation. For the same continuous cooling schedule, as austenite deformed at lower temperature, the quantity of the classical sheaf-like bainite becomes less. The present results show that severe deformation leads to mechanical stabilization of austenite and causes the difficulty of bainitic ferrite propagation into the austenite. | D.S.Liu G.D.Wang X.H.Liu G.Z.Cui | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，2： | 7 |
| 3 | HOT DUCTILITY OF 304HC STAINLESS STEEL AND THE MODEL OF RESISTANCE TO DEFORMATION显示文摘The ductility map of 304HC stainless was determined by using the Gleeble-1500 dy-namic thermal-mechanical simulator. The effect of Cu on the hot ductility of 304HCstainless steel was analyzed and the mathematical model of resistance to deformationwas established. The microstructure, inclusion and fracture surface were studied byusing the method of microstructure analysis, scanning, energy spectrum and electronmicroscope. The results show that Cu has effect on the hot ductility, and the hotductility of 30,4HC stainless steel decrease with the increase of content of Cu. Thedeformation temperature also has much effect on the hot ductility, the suitable defor-mation temperature are 1100-1200℃. The reason of it is that the Cu rich chemicalcompounds were precipitated from austenite phase during cooling. The Cu rich chem-ical compounds are brittle substance such as Cu2S, Cu2O and ε-Cu etc. | H.S.Di G.Z.Cui G.D.Wang X.H.Liu | 2003 | Acta Metallurgica Sinica(English Letters)2003，16，2： | 4 |
| 4 | INFLUENCE OF HOT DEFORMATION ON CONTINUOUSCOOLING BAINITIC TRANSFORMATION IN A LOWCARBON STEEL显示文摘The influence of hot deformation conditions on continuous cooling bainitic transformation has been investigated for a low carbon microalloyed steel. The CCT diagrams show that deformation in unrecrpstallized austcnite ation can accelerate transformation process. Bainitic transformation in intermediate transformation temperature region is prominent, and the proeutectoid polygonal ferrite transformation at evelated high temperature is suppressed. According to optical and TEM analyses, low carbon bainitic ferrite is characterized by granular and lathlike ferrite, based on the cooling rate and deformation conditions. For nondeformation, groaps of coarse parallel ferrite lath form from the prior austenite grain boundaries with the same crystallographic orientation. For heavy deformaton, cell structure within the austenite grains due to the high dislocation density formed, which provides more nucleation sites for bainite ferrite. So deformation can discontinue the growth of ferrite laths and decrease the length of ferrite laths. | Z.D.Wang J.B.Qu X.H.Liu G.D.Wang | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，2： | 4 |
| 5 | Self-induced birefringence of white-light continuum generated by interaction of focused femtosecond laser pulses with fused silica显示文摘White-light continuum can be induced by the interaction of intense femtosecond laser pulses with condensed materials.By using two orthogonal polarizers,a self-induced birefringence of continuum is observed when focusing femtosecond laser pulses into bulk fused silica.That is,the generated white-light continuum is synchronously modulated anisotropically while propagating in fused silica.Time-resolved detection confirms that self-induced birefringence of continuum shows a growth and saturation feature with time evolution.By adjusting laser energy,the transmitted intensity of continuum modulated by self-induced birefringence also varies correspondingly.Morphology analysis with time evolution indicates that it is the focused femtosecond laser pulses that induce anisotropic microstructures in bulk fused silica,and the anisotropic structures at the same time modulate the generated continuum. | J.Qian G.D.Wang K.Y.Lou D.Y.Shen Q.Fu Q.Z.Zhao | 2020 | High Power Laser Science and Engineering2020，8，2： | 2 |
| 6 | DEVELOPMENT OF NEW THERMO-MECHANICAL SIMULATOR显示文摘A new multifunction thermo-mechanical simulator was successfully developed. The accuracy of measurement and control is very high through all digital control. More than twenty tests may be fulfilled including tension, compression, torsion, combination large deformation that meets the study of supersteel, etc. Its performance is introduced in the paper, such as designed ideas, machine structure, man-machine interface, control system, etc. | Z.G.Luo H.L.Su D.H.Zhang G.D.Wang X.H.Liu | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，1： | 2 |
| 7 | Effect of Rotation Rate on Microstructure and Mechanical Properties of Friction Stir Spot Welded DP780 Steel显示文摘DP780 steel sheets consisting of ferrite and martensite were successfully friction stir spot welded(FSSW)at the rotation rates of 500 to 1500 r/min using a W-Re alloy tool.The effect of rotation rate on microstructure and mechanical properties of the FSSW DP780 was investigated.The peak temperatures in the welds at various rotation rates were identified to be above A3temperature.FSSW caused the dynamic recrystallization in the stir zone(SZ),thereby producing the fine equiaxed grain structures.At the higher rotation rates of≥1000 r/min,a full martensitic structure was observed throughout the SZs,whereas at the lower rotation rate of 500 r/min,the SZ consisted of a fine dual phase structure of ferrite and martensite due to the action of deformation induced ferrite transformation.The maximum average failure load as high as 18.2 k N was obtained at the rotation rate of 1000 r/min and the fracture occurred at the thinned upper sheet. | G.M.Xie H.B.Cui Z.A.Luo W.Yu J.Ma G.D.Wang | 2016 | Journal of Materials Science & Technology2016，32，4： | 2 |
| 8 | MODELLING FOR PREDICTION OF CONTINUOUS COOLING TRANSFORMATION KINETICS OF HOT-DEFORMED AUSTENITE STEEL显示文摘On the thermodynamics basis of regular solution sub-lattice model and soperelement model, kinetics basis of Cahn’s transformation kinetics theory, and according to Scheil’s additivity rule and eoperimental results obtained by thermal dilation method,a prediction model of transformations from hot-deformed austenite to ferrite, pearlite and bainite in low alloy steels, which could be applied to continuoas cooling process, is developed. The calculated transformed junctions of each phase based on laboratory controlled rolling and controlled cooling conditions in a low alloy steel are in reasonable agreement with the measured ones. | J.B.Qu Z.D.Wang X.H.Liu G.D.Wang | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，3： | 1 |
| 9 | Effect of grain size on the intrinsic mechanical stability of austenite in transformation-induced plasticity steels:The competition between martensite transformation and dislocation slip显示文摘The deformation accompanied by austenite to martensite trans-formation was first studied in Fe-Ni alloys,high-Mn steels,and austenitic stainless steels with a full austenite microstructure.The plasticity of these steels can be improved by the trans-formation during deformation and hence they were named as transformation-induced plasticity(TRIP)steels[1].Over the past few decades,a series of TRIP steels with multiphase microstructure for automotive applications were developed.These steels contain-ing a certain amount of austenite were called TRIP-assisted steels,such as low-alloy TRIP steels[2],carbide-free bainitic steels[3],δ-TRIP steels[4],quenching and partitioning steels[5],and medium-Mn steels[6].The mechanical property of TRIP steels is largely determined by the mechanical stability of austenite[7]which de-pends on the chemical composition[8],grain size[9],orientation[10],and morphology[11]of austenite grains,as well as the nature of neighboring phases[12].In most cases of TRIP-assisted steels,larger austenite grains transform to martensite earlier or faster than smaller austenite grains with the increase of macrostrain[13-18],indicating lower mechanical stability.However,larger austen-ite grains usually contain less C and Mn[13,17-19]and suffer more strain than smaller grains during deformation[20],it doesn’t mean that grain refinement increases the mechanical stability of austen-ite. | D.P.Yang T.Wang Z.T.Miao P.J.Du G.D.Wang H.L.Yi | 2023 | Journal of Materials Science & Technology2023，，31： | 0 |
| 10 | A high specific Young's modulus steel reinforced by spheroidal kappa-carbide显示文摘1.Introduction High strength steels continue to be developed for automotive applications to increase safety and reduce lightweight by downgauging[1,2].In addition,reducing density is another solution for the lightweight of automotive components[3,4].Aluminum addition could effectively reduce the density of steels,since it has a low atomic mass and invokes a lattice expansion[5]. | P.Chen J.Fu X.Xu C.Lin J.C.Pang X.W.Li R.D.K.Misra G.D.Wang H.L.Yi | 2021 | Journal of Materials Science & Technology2021，，28： | 0 |
| 11 | MATHEMATICAL MODELLING OF PHASE TRANSFORMATION FROM HOT-DEFORMED AUSTENITE IN LOW CARBON STEELS显示文摘On the basis of superelement model, Cahn's transformation kinetics theory and Scheil's additivity rule, the CCT diagrams and transformation kinetics in low carbon steel were predicted considering both undeformed and deformed conditions. The influence of deformation on phase equilibria and transformation incubation period was evaluated quantitatively. The recrystallization kinetics and the evolution of dislocation density were calculated during continuous cooling. The results show deformation considerably shortens transformation incubation period, accelerates transformation kinetics and makes CCT curve shift leftwards. The calculated CCT diagrams and the volume fraction of each phase are in good agreement with measurements. | Y.B.Xu G.D.Wang X.H.Liu | 2003 | Acta Metallurgica Sinica(English Letters)2003，16，3： | 0 |
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