检索结果-南通市图书馆

International Journal of Minerals,Metallurgy and Materials 2016年第5期23卷 548-562页

作者： Homam Naffakh-Moosavy Department of Materials Engineering Faculty of Engineering Tarbiat Modares University Tehran 14115-143 Iran

The present research aims to establish a quantitative relation between microstructure and chemical composition （i.e., Ti, Al, and Nb） of newly designed nickel-based superalloys. This research attempts to identify an optimum microstructure at which the minimum quanti- fies of γ/γ＇ and γ/γ＂ compounds are achieved and the best castability is predicted. The results demonstrate that the highest quantity of inter- metallic eutectics （i.e., 41.5wt%） is formed at 9.8wt% （Ti ＋ A1）. A significant quantity of intermetallics formed in superalloy 1 （with a com- position of7 - 9.8wt% （Ti ＋ A1））, which can deteriorate its castability. The type and morphology of the eutectics changed and the amount considerably decreased with decreasing Ti ＋ A1 content in superalloy 2 （with a composition ofy - 7.6wt% （Ti ＋ A1）, ***% Nb）. Thus, it is predicted that the castability would improve for superalloy 2. The same trend was observed for superalloy 4 （with a composition of 7 - 3.7wt% （Ti ＋ A1）, 4.4wt% Nb）. This means that the amount of Laves increases with increasing Nb （to 4.4wt%） and decreasing Ti ＋ A1 （to 3.7wt%） in su- peralloy 4. The best castability was predicted for superalloy 3 （with a composition ofy - 5.7wt% （Ti ＋ A1）, 2.8wt% Nb）.

关键词： nickel-based superalloys intermetallics castability microstructural evolution chemical composition

Effects of Co and Nb on the Crack of Additive Manufacturing nickel-based superalloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1601-1610页

作者： Kejie Tan Jinli Xie Hailong Qin Bin Xu Guichen Hou Jinguo Li Zhongnan Bi Ji Zhang Beijing Key Laboratory of Advanced High Temperature Materials Central Iron&Steel Research InstituteBeijing100081China Beijing GAONA Materials&Technology Co. LTDBeijing100081China superalloys Division Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

Increasing the print quality is the critical requirement for the additive manufactured complex part of aero-engines of nickel-based superalloys.A study of the effects of Co and Nb on the crack is performed focusing on the selective laser melting(SLM)nickel-based *** this paper,the solvus temperature of γ',crack characteristics,microstructure,thermal expansion,and mechanical properties of SLM nickel-based superalloy are investigated by varying the content of Co and *** alloy with 15Co/0Nb shows the highest comprehensive *** increases the crack risk and thermal deformation,and then Co accelerates the stress ***,Co is an extremely important alloying element for improving the quality of SLM nickel-based ***,the crack growth kinetics and the strain difference are discussed to reveal the SLM crack regular that is affected by time or *** analysis work on the effect of alloying elements can obtain an effective foundational theory to guide the composition optimization of SLM nickel-based superalloys.

关键词： nickel-based superalloys Selective laser melting Element effect Crack

A Prediction Method of Fracture Toughness of nickel-based superalloys

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2022年第7期42卷 121-132页

作者： Yabin Xu Lulu Cui Xiaowei Xu School of Computer Beijing Information Science and Technology UniversityBeijing100101China Department of Information Science University of Arkansas at Little RockArkansas72204USA

Fracture toughness plays a vital role in damage tolerance design of materials and assessment of structural *** solve these problems of com-plexity,time-consuming,and low accuracy in obtaining the fracture toughness value of nickel-based superalloys through experiments.A combination prediction model is proposed based on the principle of materials genome engineering,the fracture toughness values of nickel-based superalloys at different temperatures,and different compositions can be predicted based on the existing experimental ***,to solve the problem of insufﬁcient feature extraction based on manual experience,the Deep Belief Network(DBN)is used to extract features,and an attention mechanism module is *** achieve the purpose of strengthen-ing the important features,an attention weight is assigned to each feature accord-ing to the importance of the ***,the feature vectors obtained by the DBN module based on the Attention mechanism(A-DBN)are spliced with the original ***,the prediction accuracy of the model is improved by extracting high-order combined features and low-order linear features between input and output ***,the spliced feature vectors are put into the Support Vector Regression(SVR)model to further improve the regression prediction abil-ity of the *** results of the contrast experiment show that the model can effectively improve the prediction accuracy of the fracture toughness value of nickel-based superalloys.

关键词： nickel-based superalloys fracture toughness materials genome engineering deep belief network attention mechanism support vector regression

Spin and spin-orbit coupling effects in nickel-based superalloys:A first-principles study on Ni_(3)Al doped with Ta/W/Re

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第1期31卷 458-464页

作者： Liping Liu Jin Cao Wei Guo Chongyu Wang Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE) School of PhysicsBeijing Institute of TechnologyBeijing 100081China Department of Physics Tsinghua UniversityBeijing 100084China

Heavy elements(X=Ta/W/Re)play an important role in the performance of superalloys,which enhance the strength,anti-oxidation,creep resistance,and anti-corrosiveness of alloy materials in a high-temperature *** the present research,the heavy element doping effects in FCC-Ni(γ)and Ni_(3)Al(γ')systems are investigated in terms of their thermodynamic and mechanical properties,as well as electronic *** lattice constant,bulk modulus,elastic constant,and dopant formation energy in non-spin,spin polarized,and spin-orbit coupling(SOC)calculations are *** results show that the SOC effects are important in accurate electronic structure calculations for alloys with heavy *** find that including spin for bothγandγ'phases is necessary and sufficient for most cases,but the dopant formation energy is sensitive to different spin effects,for instance,in the absence of SOC,even spin-polarized calculations give 1%to 9%variance in the dopant formation energy in our *** structures calculations indicate that spin polarization causes a split in the metal d states,and SOC introduces a variance in the spin-up and spin-down states of the d states of heavy metals and reduces the magnetic moment of the system.

关键词： nickel-based superalloys Ni_(3)Al spin spin-orbit coupling mechanical properties electronic structures

Influence of rare earth oxides on microstructure and mechanical properties of nickel-based superalloys fabricated by high energy beam processing:A review

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第9期42卷 1629-1645,I0001页

作者： Lianjie Bi Hua Yan Peilei Zhang Haichuan Shi Zhiyuan Li Ruidi Li School of Materials Science and Engineering Shanghai University of Engineering ScienceShanghai201620China College of Agricultural Science and Engineering Hohai UniversityNanjing211100China Department of Mechanics and Maritime Science Chalmers University of TechnologyGothenburSE41296Sweden State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China

In this paper,the effects of rare earth oxides on the micro structure and mechanical properties of nickelbased superalloys prepared by high-energy beam processing technology were critically *** focus is on the optimal amount of rare earth oxides that can produce ideal *** attention was paid to their main strengthening mechanisms,including solid solution strengthening mainly in the form of solid solution dissolved in the nickel-based alloy and improving the microstructure of the alloy by grain refinement or fine grain strengthening produced by homogenizing the distribution phase.Y_(2)O_(3),La_(2)O_(3) and CeO_(2) rare earth oxides can also improve the fluidity of the alloy molten pool and reduce the segregation of alloying *** advantages can significantly improve the mechanical properties of the ***,this paper outlines the future research directions of rare earth oxides,aiming to expand their application potential.

关键词： Rare earths High energy beam nickel-based superalloys Microstructure Mechanical properties

Oxidation behaviors of wrought nickel-based superalloys in various high temperature environments

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2011年第7期21卷 1524-1531页

作者： Changheui JANG Daejong KIM Donghoon KIM Injin SAH Woo-Seog RYU Young-sung YOO Korea Advanced Institute of Science and Technology 291 Daehak-roYuseong-guDaejeon305-701Korea Korea Atomic Energy Research Institute 150 Deogjin-dongYuseong-guDaejeon 305-600Korea Korea Electric Power Research Institute 103-16 Munji-dongYuseong-guDaejeon 305-380Korea

Oxidation characteristics of Alloy 617 and Haynes 230 at 900 oC in simulated helium environment,hot steam environment containing H2 as well as in air and pure helium conditions were *** to air condition,the oxidation rate of Alloy 617 was not significantly affected in helium and hot steam environments,while Haynes 230 showed lower oxidation rate in helium *** the other hand,the oxide morphology and structure of Alloy 617 were strongly affected by the environments,but those of Haynes 230 were less dependent on the *** Haynes 230,a Cr2O3 inner layer and a protective MnCr2O4 outer layer were formed in all environments,which contributed to the better oxidation *** the mechanical properties,such as creep and tensile properties,were significantly affected by the oxidation behaviors,surface treatment methods to enhance oxidation resistance of these alloys should be developed.

关键词： oxidation nickel-based superalloys very high temperature reactor (VHTR) impure helium hot steam

Crack Types, Mechanisms, and Suppression Methods during High-energy Beam Additive Manufacturing of nickel-based superalloys: A Review

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第4期1卷 51-77页

作者： Qingsong Wei Yin Xie Qing Teng Muyu Shen Shanshan Sun Chao Cai State Key Laboratory of Materials Processing and Die&Mould Technology School of Material Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

nickel-based superalloys have been widely used in aerospace fields,especially for engine hot-end parts,because of their excellent high-temperature ***,they are difficult to machine and process because of their special ***-energy beam additive manufacturing(HEB-AM)of nickel-based superalloys has shown great application potential in aerospace and other ***,HEB-AM of nickel-based superalloys faces serious cracking problems because of the unique characteristics of superalloys,and this has become the most significant bottleneck restricting their *** this review,the current research status related to the types,formation mechanisms,and suppression methods of cracks in nickel-based superalloys produced by HEB-AM is *** initiation and propagation mechanisms of cracks and their multiple influencing factors are also analyzed and ***,several possible research directions to solve the cracking problems in nickel-based superalloys produced by HEB-AM are *** review provides an in-depth and comprehensive understanding of the cracking problem in AM nickel-based *** also provides valuable references for AM crack-free nickel-based superalloy components.

关键词： High-energy beam Additive manufacturing Powder bed fusion Directed energy deposition nickel-based superalloys Cracks

Microstructure and Formation Mechanism of Aluminized Coatings on nickel-based superalloys

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microstructure and Formation Mechanism of Aluminized Coating...

Evolution of precipitates in Ni-Co-Cr-W-Mo superalloys with different tungsten contents

Fifth International Conference on Surface Engineering

作者： Jibin Pei Liwen Zhang Jing Niu Quanzhong Zhang School of materials science and engineering Dalian university of technology Dalian Liaoning 116085 China

Aluminized coatings prepared on nickel-based superalloys can provide good protection against high temperature oxidation and hot *** study investigated the simple aluminized and silicon-aluminized coatings on nickel-based superalloy *** simple aluminized coating was prepared by pack cementation and the Al-Si coating was prepared by slurry aluminizing,*** microstructure of simple aluminized and Al-Si coating was analyzed by means of scanning electron microscope（SEM）,X-ray diffraction（XRD） and electron probe microanalysis（EPMA）.And the formation mechanism of simple aluminized and Al-Si coatings was *** results showed that the simple aluminized coating was about 49 um thick and consisted of three *** outer layer mainly consisted of Al-rich β-*** intermediate layer consisted of Ni-rich β-NiAl and *** inner diffusion layer consisted of Cr-rich and γ’-*** microstructure of Al-Si coating showed that the coating was about 70 um thick and consisted of five *** Al-Si coating consisted of CrxSiy,Al-rich β-NiAl,Ni-rich β-NiAl,Cr-rich and γ’-*** microstructure of simple aluminized coating was compared with that of Al-Si coating in order to find out the effect of *** to the effect of Si,there was a Transition layer in Al-Si *** Al-Si coating was thicker than simple aluminized *** declining trend of the aluminum concentration in the Al-Si coating was smoother than that of the simple aluminized coating.

关键词： nickel-based superalloys simple aluminized silicon-aluminized microstructure formation mechanism

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Rare Metals 2020年第6期39卷 716-724页

作者： Han-Sheng Bao Zhi-Hua Gong Zheng-Zong Chen Gang Yang Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China

The Ni-Co-Cr-W-Mo system is critical for the design of nickel-based *** system stabilizes different topologically close-packed(TCP)phases in many commercially superalloys with high W and Mo *** electron microscopy(SEM),transmission electron microscopy(TEM)and thermodynamic calculations were applied to investigate the thermodynamics of the precipitates in two different W-contained Ni-Co-Cr-WMo superalloys(Alloy 1 and Alloy 2).Computational thermodynamics verifies the experimental observation of theμphase formation as a function of temperature and alloy chemistry,but the kinetics for the precipitation of the M6 C phase do not agree with the experimental *** major precipitates of Alloy 1 at temperatures of700℃and 750℃during long-time exposure are M23 C6,γ′phase and MC;for Alloy 2,they are M23 C6,γ′phase,MC,M6 C andμphase.W addition is found to promote the precipitation of M6 C andμphase during exposure.M6 C has higher W and lower Ni content thanμphase,whereas M6 C is an unstable phase that would transform into M12 C after 5000-h exposure at 750℃.A great quantity of needle-likeμphases precipitated after exposure at 750℃for5000 h,which have no effect on the impact properties of Alloy 2.

关键词： nickel-based superalloys M6C μphase Long-time exposure M12C

Thermal stress relaxation in shot peened and laser peened nickel-based superalloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第24期59卷 100-106页

作者： K.S.Chin S.Idapalapati D.T.Ardi School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Advanced Remanufacturing and Technology Centre 3 CleanTech LoopCleanTech Two#01/01Singapore 637143Singapore

The effects of cold work produced by peening processes in residual stress relaxation under elevated temperatures were *** types of peening processes namely shot peening and laser peening were used to generate different amount of cold work and residual stresses in the *** of residual stress induced by cold working were carried out using X-ray diffraction coupled with electrochemical polishing method to measure the variation of residual stress with *** stresses in shot peened samples were observed to relax more rapidly than that of laser peened ones when subjected to thermal *** data collected from the experimental investigation was then used to build a correlation function to model the effects of cold work on residual stress relaxation.A parameter describing cold work’s contribution to stress relaxation is introduced into the well-known Zener-WertAvrami(ZWA)*** model was validated against experimental measurements and showed good agreement in both shot peened and laser peened samples.

关键词： Residual stress Cold work Surface treatment nickel-based superalloys