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mICROSTRUCTURE AND mECHANICAL PROPERTY DEVELOPmENT IN THE SImULATED HEAT AFFECTED ZONE OF V TREATED HSLA STEELS

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Acta metallurgica Sinica(English Letters) 2006年第1期19卷 57-67页

作者： Y. T. Chen A.m. Guo L.x. wu J. Zeng P.H. Li National Enterprise Technology Center Wuhan Iron and Steel （Group） Co.Wuhan 430080 China

The simulated heat affected zone （HAZ） of the high strength low alloy （HSLA） steels containing 0%, 0.047%, 0.097% and 0.151% vanadium, respectively, were studied with Gleeble-2000 thermomechanical simulator to determine the influence of vanadium addition on the mechanical properties of the HAZ. The HAZ simulation involved reheating the samples to 1350℃, and then cooling to ambient temperature at a cooling rate of 5℃/s ranging from 800 to 500℃ （△8/5=60s）. The mechanical properties including tensile strength and -20℃ impact toughness were conducted. The microstructures of the base steel and the simulated HAZs were investigated using optical microscope, scanning electron microscope （ SEm ） and transmission electron microscope （TEm）. Based on the systemutic examination, the present work confirmed that about 0.05% vanadium addition to low carbon low alloy steels resulted in expected balance of strength and toughness of the HAZ. And more than 0.10% levels addition led to detrimental toughness of the HAZ SEm study showed that the simulated 0.097% and 0.151%V HAZs consisted of more coarse ferrite plates with greater and more m-A constituents along austenite grain and ferrite plate bound- aries. The impact fracture surfaces of the simulated 0.097% and 0.151%V HAZs showed typically brittle mode with predominant cleavages. The size of the facet in the fracture surface increased with increasing vanadium level from 0.097% to 0.151%.As a result, the simulated 0.151% V HAZ has the lowest impact toughness of the four specimens.

关键词： vanadium high strength low alloy (HSLA) steel mechanical property,heat affected zone (HAZ)

Effect of forced-air cooling on the microstructure and age-hardening response of extruded mg-Gd-Y-Zn-Zr alloy full with LPSO lamella

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Journal of materials Science & Technology 2021年第14期73卷 66-75页

作者： S.Z.wu T.Nakata G.Z.Tang C.xu x.J.Wang x.W.Li x.G.Qiao m.Y.Zheng L.Geng S.Kamado G.H.Fan School of materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Research Center for Advanced magnesium Technology Nagaoka University of TechnologyNagaoka 940-2188Japan School of material Science and Engineering Harbin University of Science and TechnologyHarbin 150040China Key Laboratory for Light-weight materials Nanjing Tech UniversityNanjing 211816China

The homogenized mg-8.2 Gd-3.8 Y-1.0 Zn-0.4 Zr(wt.%)alloy full of plate-shaped long period stacking ordered(LPSO)phases was hot extruded in the atmosphere and cooled by the forced-air,then the effect of forced-air cooling on the microstructure and age-hardening response of the alloy was investigated in this *** results show that in comparison with the extruded sample cooling in the atmosphere,the forced-air cooling restricts dynamic recrystallization(DRx)and brings about finer dynamic recrystallized(DRxed)grain size,stronger basal texture and higher dislocation ***,the forced-air cooling promotes the dynamic precipitation in the DRxed regions and facilitates formation of plate-shaped LPSO phases andγ’phases with smaller interspacing in the unrecrystallized(un DRxed)regions,then slightly restricts the precipitation ofβphases during *** peak-ageing treatment,the extruded sample with forced-air cooling shows superior tensile properties with a tensile yield strength of 439 mPa,an ultimate tensile strength of 493 mPa,and elongation to failure of 18.6%.

关键词： mg-RE alloy LPSO phase Dynamic recrystallization Precipitation mechanical properties

Textural and functional analysis of sorghum flour cookies as ice cream inclusions

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Grain & Oil Science and Technology 2023年第2期6卷 100-111页

作者： J.S.myers Scott R.Bean F.m.Aramouni x.wu K.A.Schmidt Food Science Institute Kansas State University ManhattanKSUSA United States Department of Agriculture ManhattanKSUSA Department of Animal Science and Industry Kansas State UniversityManhattanKSUnited States of America

Flour serves as one of the primary ingredients of cookies,which affects dough properties,physical changes during baking,and post-baking cookie *** gluten-free cookie formulations were developed with the goal of use as inclusions in frozen *** and chocolate cookies were made with sorghum flour or all-purpose wheat flour and then evaluated for physical and chemical *** determine functionality in a frozen state,texture analysis was conducted on cookies at−30℃,−17°C,and 20℃,replicating various ice cream storage *** simulate the process effect of incorporating the product into a frozen dessert,cookies were crumbled mechanically,and the crumbles were separated based on *** evaluating cookies,no significant differences(Pmoisture contents than chocolate cookies;further,blonde cookies made from sorghum flour had less moisture than those made with wheat *** the cookie temperature decreased from 20℃to−17℃,cookie hardness increased,with flour type having no *** formula,cookies had similar instrumental color ***,blonde cookies made from sorghum flour produced more smaller-sized pieces than those made from wheat *** results of this study demonstrate that sorghum flour cookies have desirable properties for use as inclusions in ice cream and other frozen desserts.

关键词： Cookie Sorghum Inclusion Gluten-free Ice cream

Clinicopathological and oncological significance of persistent prostate-specific antigen after radical prostatectomy:A systematic review and meta-analysis

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Asian Journal of Urology 2023年第3期10卷 317-328页

作者： Shulin wu Sharron x.Lin Kristine m.Cornejo Rory K.Crotty michael L.Blute Douglas m.Dahl Chin-Lee wu Department of Urology Massachusetts General HospitalHarvard Medical SchoolBostonMAUSA Department of Pathology Massachusetts General HospitalHarvard Medical SchoolBostonMAUSA

Objective:To investigate the association of persistently elevated prostate-specific antigen(PSA)after radical prostatectomy(RP)with clinicopathological features and long-term oncological prognosis for the development of a potential management ***:A systematic literature search was performed using Pubmed and Web of Science up to June 2021 to identify the eligible studies focusing on understanding the impact of persistent PSA in patients who underwent RP for localized prostate ***-analyses were performed on parameters with available ***:A total of 32 RP studies were identified,of which 11 included 26719 patients with consecutive cohorts and the remaining 21 comprised 24177 patients with cohorts carrying specific *** the 11 studies with consecutive cohorts,the incidence of persistent PSA varied between 3.1%and 34.6%with a median of 11.0%.meta-analyses revealed patients with persistent PSA consistently showed unfavorable clinicopathological features and a more than 3.5-fold risk of poorer biochemical recurrence,metastasis,and prostate cancer-specific mortality prognosis independently,when compared to patients with undetectable ***,cases with persistent PSA in different specific patient cohorts with a higher risk of prostate cancer also showed a trend of worse ***:We found that the frequency of persistent PSA was about 11.0%in consecutive RP *** PSA was significantly associated with unfavorable clinicopathological characteristics and worse oncological *** with persistent PSA after RP may benefit from early salvage treatment to delay or prevent biochemical recurrence,improving oncological outcomes for these *** prospective randomized controlled trials are warranted to understand optimal systemic therapy in these patients.

关键词： Prostate cancer Radical prostatectomy Persistent prostatespecific antigen Prognosis Salvage Systematic review meta-analysis

mODELING OF STRAIN-INDUCED PRECIPITATION KINETICS IN Nb mICROALLOYED STEELS

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Acta metallurgica Sinica(English Letters) 2006年第5期19卷 385-390页

作者： x. G. Zhou Z. Y. Liu D. wu Z. Li C.m. Li State Key Lab. of Rolling and Automation Northeastern University Shenyang 110004 China Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Engineering ＆ Research Incorporation Limited WISDRI （Wuhan Iron ＆ Steel Design and

On the basis of the thermodynamic calculation of precipitation and considering the effect of strain on the precipitation behavior and chemical composition （Si and mn）, the kinetics of precipitation from austenite has been investigated for different temperatures and strains. Nucleation theory and the solubility product of niobium, carbon, and nitrogen in austenite have been used to derive equations for the start time of precipitation as a function of temperature and composition. The value of n in Avrami equation was determined using the available experimental data from the published reports, which indicated that n is a constant independent of temperature and the end time of precipitation is a function of n and the start time of precipitation. The values of the start time and end time of precipitation predicted by the new model are compared with the experimental values and a good agreement was obtained between both.

关键词： strain-induced precipitation start time of precipitation end time ofprecipitation precipitation kinetics

Estimation of J—R Curves for Small-Sized COEC Specimens and Its Application Considering Crack-Tip Cons tr aints

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Acta mechanica Solida Sinica 2019年第3期32卷 261-276页

作者： G.W.He C.Bao L.x.Cai Y.J.wu Applied mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 China

The normalization method has been employed to estimate the J-resistance (J—R) curves for C-shaped outside edge-notched compression (COEC) specimens of SA-508 steel. The COEC specimens present the lowest J—R curves in comparison with other three types of specimens. Based on the J—Q—m met hod, the constraint parame ter Q determined at the mid-plane in the through-thickness direction of the specimen is used to approximately quantify the threedimensional crack-tip constraint for COEC specimens. Combining with the previous experiments on J—R curves, the constraint-coirected J—R curves for SA-508 steel specimens are given, which may be used to predict the fracture toughness of actual cracked components in structural integrity assessment.

关键词： Ductile fracture toughness COEC specimen Dimensionless load separation principle Normalization method Crack-tip constraint J-Q-m method

The Crystal structure of Hexakisammonium Diacety loctamoly bdate Tetrahydrate

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Chinese Journal of Structural Chemistry 2000年第3期19卷 191-194页

作者： Wang, S Lin, x Lu, CZ wu, Dm Yang, WB Zhuang, HH Chinese Acad Sci Fujian Inst Res Struct Matter State Key Lab Struct Chem Fuzhou 350002 Peoples R China

The title compound, 〔NH 4〕 6〔(CH 3CO) 2(mo 8O 28 )〕·4H 2O, was produced from (NH 4) 6〔mo 7O 24 〕·4H 2O aqueous solution in the presence of N 2H 4·H 2SO 4 and its structure has been deter... 详细信息

The title compound, 〔NH 4〕 6〔(CH 3CO) 2(mo 8O 28 )〕·4H 2O, was produced from (NH 4) 6〔mo 7O 24 〕·4H 2O aqueous solution in the presence of N 2H 4·H 2SO 4 and its structure has been determined by x ray single crystal analysis. The crystallographic data: C 4H 38 mo 8N 6O 34 , m r =1481.92, triclinic, P1, a=8.127(2), b = 10\^373(2), c = 12.383(3) , α=99.51(3), β=105.47(3), γ=112.92(3)°, V=883.0(3) 3, Z=1, D c =2.787g/cm 3, F(000)= 712, μ =2.864 mm -1 , Final R =0.0368 and wR =0.0924 for 2926 reflections with I>2σ(I ). The x ray crystal structure analysis reveals that there is one independent molecule in the unit cell of the title compound which contains one centrosymmetric diacetyloctamolybdate anion, six ammonium cations and four water molecules.

关键词： diacetyloctamolybdate centrosymmetric hexakisammonium

First-Principles Study of the Influence of Lattice misfit on the Behavior and the Ductility Effect of Hafnium in Ni-Ni3AI System

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Acta metallurgica Sinica(English Letters) 2014年第1期27卷 87-94页

作者： Y. wu J. Guo W. Zhang x. ma Q. Zhang J. Hou R. Huang x. Liu Institute of molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan 243002 China Shenyang National Laboratory for materials Science Instituteof Metal Research Chinese Academy of SciencesShenyang 110016 China College of Physics Science and Technology Shenyang NormalUniversity Huanghe Street 253 Shengyang 110034 China School of materials Science and Engineering Anhui Universityof Technology Ma'anshan 243002 China

Two Ni/Ni3Al-interface-contained cluster models with/without lattice misfit are studied by first-principles method to clarify the debates about the segregation behaviors of Hafnium （Hf） and explore the influence of lattice misfit on the ductility effect of Hr. It is found that though Hf prefers to substitute A1 rather than Ni in Ni3A1 phase within most of the investigated misfit range, its stronger preferring to Ni phase than NiaA1 phase makes it impossible to go into Ni3A1 phase to occupy A1 site in Ni-Ni3A1 alloys. Bond order analysis in Hf-free case shows that lattice misfit has different effects on the Griffith work of interfacial cleavage 27int/E and the maximum theoretical shear stress Zmax of Ni and Ni3A1, contributing to the existence of anomalous strength-temperature phenomena in NiaA1 alloys. However, the addition of Hf will make the 27int/E （or Zmax） of both Ni3A1 and Ni decrease （or increase） with lattice misfit, indicating that the addition of Hf may make the anomalous strength-temperature relationship in Ni3A1 region disappear locally.

关键词： Hafnium Lattice misfit Segregation Ductility

Coherent Acoustic Phonon and Its Chirping in Dirac Semimetal Cd_3As_2

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Chinese Physics Letters 2018年第11期35卷 56-60页

作者： Fei Sun m.Yang m W Yang Q.wu H.Zhao x.Ye Youguo Shi Jimin Zhao Beijing National Laboratory for Condensed matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190 School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049

Ultrafast optical spectroscopy of a single crystal of a Dirac semimetal Cd_3As_（2 ）is carried *** acoustic phonon（AP）mode with central frequency f=0.037 THz（i.e.,1.23 cm^（-1）or 0.153 meV）is unambiguously generated and detected,which we attribute to laser-induced thermal *** AP chirping（i.e.,variation of the phonon frequency）is clearly detected,which is ascribed to heat capacity variation with *** comparing our experimental results and the theoretical model,we obtain a chirping time constant,which is 31.2 ps at 6 K and 19.8 ps at 300 K,***,we identify an asymmetry in the AP frequency domain peak and find that it is caused by the chirping,instead of a Fano ***,we experimentally demonstrate that the central frequency of AP is extremely stable with varying laser fluence,as well as temperature,which endows Cd_3As_2application potentials in thermoelectric devices.

关键词： As Cd AP Coherent Acoustic Phonon and Its Chirping in Dirac Semimetal Cd3As2