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Microstructure and Mechanical Properties of a Spray-Formed Superalloy

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Acta Metallurgica Sinica(English Letters) 2014年第6期27卷 1063-1069页

作者： Fuwei Kang fuyang cao Xuemin Zhang Hongyan Yue Yicheng Feng School of Materials Science and Engineering Harbin University of Science and Technology School of Materials Science and Engineering Harbin Institute of Technology

The microstructural evolution and mechanical properties of a spray-formed superalloy were studied in this paper. Based on a better understanding of the microstructural evolution of the spray-formed superalloy during solution treatment, an optimum solution treatment process was obtained, namely, at 1,140 °C for 6 h, and air cooling（AC）. The effects of the ageing treatments on the mechanical properties of the post-solution-treated spray-formed superalloy were evaluated using ageing harden curves and tensile testing. The results indicated that the maximum hardness value was achieved at 850 °C for 8 h, AC. Due to co-precipitation of primary and secondary c0 precipitates during the heat treatment,the spray-formed superalloy obtained an excellent combination of yield strength（YS = 1,110 MPa）, ultimate tensile strength（UTS = 1,503 MPa）, ductility（elongation, EL = 21%） and excellent stress rupture properties at 650 °C（UTS = 1,209 MPa, EL = 15.8%）. The heat treatment also improved the rupture life at 650 °C/950 MPa and 750 °C/539 MPa up to 140 h without rupturing. The tensile-fractured surfaces exhibit ductile transgranular failure feature. The optimum heat treatment process was determined to be 1,140 °C/6 h＋850 °C/8 h＋AC.

关键词： Spray-formed superalloy Microstructure Ageing harden Mechanical properties

Phase,microstructure and compressive properties of refractory high-entropy alloys CrHfNbTaTi and CrHfMoTaTi

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1231-1236页

作者： Jiaojiao Yi fuyang cao Mingqin Xu Lin Yang Lu Wang Long Zeng Laboratory of Advanced Multicomponent Materials School of Mechanical EngineeringJiangsu University of TechnologyChangzhou 213001China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Materials Science and Engineering Jiangsu University of TechnologyChangzhou 213001China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

New refractory high-entropy alloys,CrHfNbTaTi and CrHfMoTaTi,derived from the well-known HfNbTaTiZr alloy through principal element substitution were prepared using vacuum arc *** phase components,microstructures,and compressive properties of the alloys in the as-cast state were *** showed that both alloys were composed of BCC and cubic Laves *** terms of mechanical properties,the yield strength increased remarkably from 926 MPa for HfNbTaTiZr to 1258 MPa for CrHfNbTaTi,whereas a promising plastic strain of around 15.0%was retained in *** morphology and composition of the network-shaped interdendritic regions were closely related to the improved mechanical properties due to elemental *** were surrounded by an incompact interdendritic shell after Mo incorporation,which deteriorated yield strength and accelerated brittleness.

关键词： refractory high-entropy alloys phase structure microstructure yield strength plastic strain

Dopaminergic Neurons in the Ventral Tegmental–Prelimbic Pathway Promote the Emergence of Rats from Sevoflurane Anesthesia

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Neuroscience Bulletin 2022年第4期38卷 417-428页

作者： Yanping Song Ruitong Chu fuyang cao Yanfeng Wang Yanhong Liu Jiangbei cao Yongxin Guo Weidong Mi Li Tong Anesthesia and Operation Center The First Medical Center of ChinesePLA General HospitalBeijing 100853China Department of Anesthesia Second Affiliated Hospital of Naval Medical UniversityShanghai 200003China Chinese PLA Medical School Beijing 100853China Department of Anesthesia The Sixth Medical Center of ChinesePLA General HospitalBeijing 100048China Department of Anesthesia Xiangya HospitalCentral South UniversityChangsha 410008China

Dopaminergic neurons in the ventral tegmental area(VTA)play an important role in cognition,emergence from anesthesia,reward,and aversion,and their projection to the cortex is a crucial part of the"bottom-up"ascending activating *** prelimbic cortex(PrL)is one of the important projection regions of the ***,the roles of dopaminergic neurons in the VTA and the VTADA–PrL pathway under sevoflurane anesthesia in rats remain *** this study,we found that intraperitoneal injection and local microinjection of a dopamine D1 receptor agonist(Chloro-APB)into the PrL had an emergence-promoting effect on sevoflurane anesthesia in rats,while injection of a dopamine D1 receptor antagonist(SCH23390)deepened *** results of chemogenetics combined with microinjection and optogenetics showed that activating the VTADA–PrL pathway prolonged the induction time and shortened the emergence time of *** results demonstrate that the dopaminergic system in the VTA has an emergence-promoting effect and that the bottom-up VTADA–PrL pathway facilitates emergence from sevoflurane anesthesia.

关键词： Ventral tegmental area Prelimbic cortex Dopamine Sevoflurane General anesthesia

Modeling of Heat Transfer and Solidification Process of Spray Formed Billet

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Journal of Materials Science & Technology 2001年第1期17卷 101-102页

作者： fuyang cao Chengsong CUI and QingChun LI School of Materials Science and Engineering, Harbin institute of Technology, Harbin 150001, China Sch. of Mater. Sci. Harbin Inst. of Technol. Harbin 150001 China

In this paper, modeling of heat transfer and solidification process of spray formed billet was established. Thermal profiles of billet at various spray time and under various spray forming conditions were calculated n... 详细信息

关键词： Solidification Process solidification process simulation results spray forming heat transfer

Modeling of the Shape Forming of Composite Roll

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Journal of Materials Science & Technology 2000年第3期16卷 337-340页

作者： Chengsong CUI, Zhenyu LI, fuyang cao and Qingchun LI (School of Materials Science and Engineering, Harbin Institute of Technology, 150001, China) School of Materials Science and Engineering Harbin Institute of Technology China

A shape modeling of spray formed composite roll, which is utilized to predict the shape and dimension of roll during spray forming process, is developed in this paper. The influences of the principal spray forming parameters, such as the spatial distribution of melt mass flux, spray distance, rotating and translating speeds of substrate bar etc. , on the geometry and dimension of spray formed product were investigated.

关键词： Modeling of the Shape Forming of Composite Roll

Modeling of Heat Transfer and Solidification of Composite Roll

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Journal of Materials Science & Technology 2001年第1期17卷 87-88页

作者： Chengsong CUI fuyang cao Zhenyu LI and Qingchun LI School of Materials Science and Engineering, Harbin institute of Technology, Harbin 150001, China Sch. of Mater. Sci. Harbin Inst. of Technol. Harbin 150001 China

Modeling of heat transfer and solidification of composite roll was established and used to predict the thermal history and solidification process of roll during spray forming. Evolution of temperature field of the preform and cooling rate in the growing deposit during spray deposition and post-deposition were numerically simulated.

关键词： Modeling of Heat Transfer and Solidification of Composite Roll

Shape-predicted model of spray forming rod under scanning atomization

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Rare Metals 2007年第S1期26卷 30-35页

作者： cao fuyang,WU Peilian,NING Zhiliang,ZHAO Wenjun,and SUN Jianfei Key Laboratory for Procession Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China Harbin Inst Technol Key Lab Proc Hot Proc Met Harbin 150001 Peoples R China

A model for simulating the spray forming process with scanning atomizer was *** for the scanning atomization and the deposition processes were coupled together in order to obtain a new description of the spray forming *** model,which is able to predict the shape of a spray-formed billet prepared with scanning atomizer,was established after analyzing the changes in droplet size and density distribution along the r-axis in the spray cone in scanning *** effects of the two kinds of atomization were compared,showing that the scanning atomization is good for deposition.

关键词： spray forming atomization modeling rapid solidification scanning atomization

Tetrahedral framework nucleic acids promote the biological functions and related mechanism of synovium-derived mesenchymal stem cells and show improved articular cartilage regeneration activity in situ

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Bioactive Materials 2022年第3期7卷 411-427页

作者： Liwei Fu Pinxue Li Junyao Zhu Zhiyao Liao Cangjian Gao Hao Li Zhen Yang Tianyuan Zhao Wei Chen Yu Peng fuyang cao Chao Ning Xiang Sui Quanyi Guo Yunfeng Lin Shuyun Liu School of Medicine Nankai UniversityTianjin300071People’s Republic of China Institute of Orthopedics Chinese PLA General HospitalBeijing Key Laboratory of Regenerative Medicine in OrthopedicsKey Laboratory of Musculoskeletal Trauma&War Injuries PLANo.28 Fuxing RoadHaidian DistrictBeijing100853People’s Republic of China State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengdu610041People’s Republic of China Stomatology Department The Fifth Hospital of Sichuan ProvinceChengdu610031People’s Republic of China

Many recent studies have shown that joint-resident mesenchymal stem cells(MSCs)play a vital role in articular cartilage(AC)in situ ***,synovium-derived MSCs(SMSCs),which have strong chondrogenic differentiation potential,may be the main driver of cartilage ***,both the insufficient number of MSCs and the lack of an ideal regenerative microenvironment in the defect area will seriously affect the regeneration of *** framework nucleic acids(tFNAs),notable novel nanomaterials,are considered prospective biological regulators in biomedical ***,we aimed to explore whether tFNAs have positive effects on AC in situ regeneration and to investigate the related *** results of in vitro experiments showed that the proliferation and migration of SMSCs were significantly enhanced by *** addition,tFNAs,which were added to chondrogenic induction medium,were shown to promote the chondrogenic capacity of SMSCs by increasing the phosphorylation of Smad2/*** animal models,the injection of tFNAs improved the therapeutic outcome of cartilage defects compared with that of the control treatments without *** conclusion,this is the first report to demonstrate that tFNAs can promote the chondrogenic differentiation of SMSCs in vitro and enhance AC regeneration in vivo,indicating that tFNAs may become a promising therapeutic for AC regeneration.

关键词： Tetrahedral framework nucleic acids Articular cartilage regeneration Mesenchymal stem cells Chondrogenic differentiation

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一种新型喷射成形高温合金热变形机制

稀有金属材料与工程 2010年第7期39卷 1210-1214页

作者：康福伟孙剑飞曹福洋李周张国庆哈尔滨工业大学黑龙江哈尔滨150001 哈尔滨理工大学黑龙江哈尔滨150040 北京航空材料研究院北京100095

采用喷射成形技术制备一种新型镍基高温合金,并对其进行热等静压处理。在Gleeble-3500热力模拟试验机上进行热压缩试验,利用光学显微镜、扫描电镜(SEM)以及透射电镜(TEM)等方法对其变形机制进行研究。结果表明,高应变速率(10s-1)下变形... 详细信息

采用喷射成形技术制备一种新型镍基高温合金,并对其进行热等静压处理。在Gleeble-3500热力模拟试验机上进行热压缩试验,利用光学显微镜、扫描电镜(SEM)以及透射电镜(TEM)等方法对其变形机制进行研究。结果表明,高应变速率(10s-1)下变形,摩擦产生的热量使试样的实际变形温度高于名义变形温度,促进了动态再结晶组织的形成;高应变速率下形成的孪晶可进一步激发滑移变形,而亚晶内形成的大量位错对变形起到协调作用,保证了变形顺利进行;建立了再结晶晶粒尺寸模型lnd=8.26-0.058lnZ,表明随应变速率的增加,晶粒尺寸减小,合金变形能力增加,这与实验结果相一致。

关键词：喷射成形高温合金动态再结晶应变速率位错孪晶