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Effects of a variety of cutting fluids administered using the minimum quantity lubrication method on the surface grinding process for nickel-based alloys

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第9期18卷 728-740页

作者： Ryszard WOJCIK Krzysztof NADOLNY Instimte of Machine Tools and Production Engineering Lodz University of Technology Stefanowskiego 1/15 90-924 Lodz Poland Department of Production Engineering Koszalin University of Technology Raclawicka 15-17 75-620 Koszalin Poland

This paper presents the characteristics of nickel-based alloys, alongside their division into groups, and describes thefeatures that make such materials difficult to grind. The possibilities of exerting a positive influence upon machining conditions,especially through the proper application of grinding fluids, are briefly presented. Both the precise methodologies for, and theresults of, the experimental tests carried out on flat surfaces are also detailed. The aim of these tests was to determine the influenceof the application of two types of grinding liquid （Ecocut Mikro Plus 82 and Biocut 3000） upon the grinding force values andsurface roughness of the machined workpieces made from three nickel alloys （nickel 201, INCONEL~ alloy 600, and MONEL^alloy 400）. An additional goal of the tests was to determine the influence of grinding wheel structure on the course and results ofthe machining process. The results indicate that the physical and chemical properties of Biocut 3000 enabled the most advanta-geous properties of the machined surface roughness, alongside a simultaneous increase in grinding power, when compared to theresults when applying Ecocut Mikro Plus 82. The results showed an almost inversely proportional dependence upon the specifictangential grinding force Ft＇ and arithmetic mean deviation of the surface profile Ra values, especially in cases of machining nickel201 and INCONEL alloy 600. The original traverse grinding methodology used in the tests made it possible to assess the changesof the grinding conditions within the conventionally selected zones.

关键词： nickel-based alloys Surface grinding Minimum quantity lubrication Hard-to-cut materials Grinding force Surface roughness

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Oxidation Behavior of the nickel-based Superalloy DZ125 at 980℃

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Acta Metallurgica Sinica(English Letters) 2017年第9期30卷 857-862页

作者： Ye-Bing Hu Li Zhang Cong-Qian Cheng Peng-Tao Zhao Guang-Ping Guo Jie Zhao School of Materials Science and Engineering DalianUniversity of TechnologyDalian 116024China Beijing Institute of Aeronautical Materials Beijing 100095China

The isothermal oxidation behavior of the nickel-based superalloy DZ125 was investigated at 980 ~C through SEM/EDX and XRD. The weight loss process exhibited three periods--initial, transient and steady stages, which corre- spond to the formation of three layers on the surface. The outer layer was composed of NiO, whereas the intermediate layer mainly consisted of spinels and was accompanied with Ta-rich oxide. Alumina was evident as the inner continuous layer close to the substrate. The first formation of alumina was responsible for the initial stage of weight loss, and the formation of NiO and intermediate layer may dramatically affect on the transient and steady stage, respectively. The oxide scales effect on growth mechanism was discussed.

关键词： nickel-based Superalloy Oxidation Alumina

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Microstructural evolution and defect formation in a powder metallurgy nickel-based superalloy processed by selective laser melting

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Journal of Materials Science & Technology 2020年第1期36卷 7-17页

作者： Hongyu Wu Dong Zhang Biaobiao Yang Chao Chen Yunping Li Kechao Zhou Liang Jiang Ruiping Liu State Key Laboratory for Powder Metallurgy Powder Metallurgy Research InstituteCentral South UniversityChangsha 410083China State Key Laboratory of nickel and Cobalt Resources Comprehensive Utilization Jinchang 737100China Yuanmeng Precision Technology(Shenzhen)Institute Shenzhen 518063China

In this study,the selective laser melting(SLM)technology has been employed to manufacture a nickelbased superalloy which was conventionally prepared through powder metallurgy(PM)route.The microstructural features and defects were systematically investigated both prior to and after heat treatment and compared with the PM counterpart.Both solidification cracking and liquation cracking were observed in the SLM specimen in which the grain misorientation and low melting point(γ+γ')eutectic played a vital role in their formation mechanism.Columnar grains oriented along building direction were ubiquitous,corresponding to strongfiber texture.Solidification cell structures and melt pools are pervasive and noγ'precipitates were detected at about 10 nm scale before heat treatment.After supersolvus solution and two-step aging treatments,high volume fractionγ'precipitates emerged and their sizes and morphologies were comparable to those in PM alloy.texture is relieved and columnar grains tend to become more equiaxed due to static recrystallization process and grain boundary migration events.Significant annealing twins formed in SLM alloy and are clarified as a consequence of recrystallization.Our results provide fundamental understandings for the SLM PM nickel-based superalloy both before and after heat treatment and demonstrate the potential to fabricate this group of alloys using SLM technology.

关键词： nickel-based superalloy Selective laser melting Microstructure Defects Annealing twin

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Corrosion behavior of nickel-based 718 alloy determined by in situ electrochemical methods at different partial pressures of H2S in 25 wt% NaCl solution at 150℃

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Rare Metals 2019年第9期38卷 855-863页

作者： Yu-Bi Zhang Xiao-Liang Yang An Tang School of Mechanical Engineering Henan University of EngineeringZhengzhou 451191China Chongqing Materials Research Institute Co. LtdChonging 400707China

The corrosion behavior of nickel-based 718 alloy at seven partial pressures of H2 S(PH2 S)was investigated using electrochemical impedance spectroscopy(EIS)and polarization methods in 25 wt% NaCl solution at150℃ for 168 h.The tested results show that anodic reactions are controlled alternately by the diffusion mostly,then both charge transfer and diffusion and finally charge transfer mainly with the increment of PH2 S.The corrosive products are composed of sulfides and oxides of Ni,Cr and Fe with double layers for PH2 S of 5.1 and 13.0 MPa and three layers for PH2 S of 10.4 MPa according to microstructures and compositions of corrosion products characterized by the scanning electron microscope(SEM)and electron probe microanalysis(EPMA)methods.The inner oxides layer plays a critical role in anti-corrosion in a wet H2 S environment at high temperature and pressure.

关键词： nickel-based 718 alloy Corrosion electrochemistry Polarization Passive film

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Plastic deformation behavior of a nickel-based superalloy on the mesoscopic scale

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Journal of Materials Science & Technology 2020年第5期40卷 146-157页

作者： Qiang Zhu Chuanjie Wang Kai Yang Gang Chen Heyong Qin Peng Zhang School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264209China Central Iron&Steel Research Institute Beijing 100081China

nickel-based superalloys have become the key materials of micro-parts depending on excellent mechanical properties at high temperatures.The plastic deformation behavior is difficult to predict due to the occurrence of size effect on the mesoscopic scale.In this paper,the effect of specimen diameter to grain size ratio(D/d)on the flow stress and inhomogeneous plastic deformation behavior in compression of nickel-based superalloy cylindrical specimens was investigated on the mesoscopic scale.The results showed that when D/d is less than 9.7,the flow stress increases with the grain size.Aiming at this phenomenon,a flow stress size effect model considering compressive strain partitioning was established.The calculated flow stress values agree well with the experimental values,thus revealing the effect of D/d on the flow stress in compression of nickel-base superalloy on the mesoscopic scale.The inhomogeneous plastic deformation during compression deformation increases with the grain size.The end surface profiles evolve from a regular circular shape to an irregular shape with the grain size.The surface folding phenomenon occurs only in partially compressed specimen with a few grains across the diameter.Crystal plasticity finite-element(CPFE)simulation of compression deformation on the mesoscopic scale real-time displayed the evolution of microstructure.The study of this paper has important guiding significance for understanding the influence of D/d on the compression deformation behavior of nickel-based superalloy on the mesoscopic scale.

关键词： nickel-based superalloy Size effect Compression deformation Surface morphology Crystal plasticity Mesoscopic scale

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Effect of stress ratio on HCF and VHCF properties at temperatures of 20 °C and 700 °C for nickel-based wrought superalloy GH3617M

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Chinese Journal of Aeronautics 2019年第9期32卷 2199-2210页

作者： Aoshuang WAN Junjiang XIONG School of Transportation Science and Engineering Beihang University

This paper attempts to investigate the effects of stress ratio and high temperature on the HCF(high-cycle-fatigue) and VHCF(very-high-cycle-fatigue) behaviors of nickel-based wrought superalloy GH3617 M. Fatigue tests over the full HCF and VHCF regimes were conducted on superalloy GH3617 M subjected to constant-amplitude loading at five stress ratios of -1, -0.5, 0,0.4, and 0.8 in environments of 20 °C and 700 °C temperatures. From experimental observation and fractographic analysis, fatigue mechanisms were deduced to reveal the synergistic interaction between high temperature and stress ratio on the HCF and VHCF behaviors of superalloy GH3617 M. A phenomenological model was crafted from available fatigue design knowledge to evaluate the synergistic interaction, and a good correlation between predictions and experiments has been achieved.

关键词： High cycle fatigue High-temperature nickel-based superalloy Stress ratio Very high cycle fatigue

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Effect of tube-electrode inner diameter on electrochemical discharge machining of nickel-based superalloy

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Chinese Journal of Aeronautics 2016年第4期29卷 1103-1110页

作者： Zhang Yan Xu Zhengyang Xing Jun Zhu Di College of Mechanical and Electrical Engineering Nanjing University of Aeronautics & Astronautics

nickel-based superalloys are widely employed in modern aircraft engines because of their excellent material characteristics, particularly in the fabrication of film cooling holes. However, the high machining requirement of a large number of film cooling holes can be extremely challenging. The hybrid machining technique of tube electrode high-speed electrochemical discharge drilling(TEHECDD) has been considered as a promising method for the production of film cooling holes. Compared with any single machining process, this hybrid technique requires the removal of more complex machining by-products, including debris produced in the electrical discharge machining process and hydroxide and bubbles generated in the electrochemical machining process. These by-products significantly affect the machining efficiency and surface quality of the machined products. In this study, tube electrodes in different inner diameters are designed and fabricated, and the effects of inner diameter on the machining efficiency and surface quality of TEHECDD are investigated. The results show that larger inner diameters could effectively improve the flushing condition and facilitate the removal of machining by-products. Therefore, higher material removal efficiency, surface quality, and electrode wear rate could be achieved by increasing the inner diameter of the tube electrode.

关键词： Electrical discharge machining Electrochemical machining Film-cooling hole Inner diameter nickel-based superalloys Tube electrode

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Steam reforming of acetic acid over Ni-Ba/Al2O3 catalysts:Impacts of barium addition on coking behaviors and formation of reaction intermediates

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Journal of Energy Chemistry 2020年第4期29卷 208-219页

作者： Zhanming Zhang Yiran Wang Kai Sun Yuewen Shao Lijun Zhang Shu Zhang Xiao Zhang Qing Liu Zhenhua Chen Xun Hu School of Material Science and Engineering University of JinanJinan 250022ShandongChina College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037JiangsuChina Fuels and Energy Technology Institute and Western Australia School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityPerthWA 6845Australia Key Laboratory of Low Carbon Energy and Chemical Engineering College of Chemical and Environmental EngineeringShandong University of Science and TechnologyQingdao 266590ShandongChina Jinzhou Medical University Jinzhou 121001LiaoningChina

The influence of barium addition to a Ni/Al2O3 catalyst on the reaction intermediates formed,the activity,resistance of the catalyst to coking,and properties of the coke formed after acetic acid steam reforming were investigated in this study.The results showed the drastic effects of barium addition on the physicochemical properties and performances of the catalyst.The solid-phase reaction between alumina and BaO formed BaAl2O4,which re-constructed the alumina structure,resulting in a decrease in the specific surface area and an increase in the resistance of metallic Ni to sintering.The addition of barium was also beneficial for enhancing the catalytic activity,resulting from the changed catalytic reaction network.The in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) study of the acetic acid steam reforming indicated that barium could effectively suppress the accumulation of the reaction intermediates of carbonyl,formate,and C=C functional groups on the catalyst surface,attributed to its relatively high ability to cause the gasification of these species.In addition,coking was considerably more significant over the Ba-Ni/Al2O3 catalyst.Moreover,the Ba-Ni/Al2O3 catalyst was more stable than the Ni/Al2O3catalyst,owing to the distinct forms of coke formed (carbon nanotube form over the Ba-Ni/Al2O3 catalyst,and the amorphous form over the Ni/Al2O3 catalyst).

关键词： Barium addition nickel-based catalysts Steam reforming of acetic acid Reaction intermediates Coking behaviors

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Hot corrosion behavior and mechanism of FGH96 P/M superalloy in molten NaCl–Na_2SO_4 salts

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Rare Metals 2019年第2期38卷 173-180页

作者： He Jiang Jian-Xin Dong Mai-Cang Zhang Lei Zheng Zhi-Hao Yao Materials Science and Engineering University of Science and Technology Beijing

Hot corrosion behavior of FGH96 powder metallurgy(P/M) superalloy in 25 % NaCl + 75 % Na_2SO_4 molten salts at 650, 700, and 750 ℃ was investigated in this paper. The methods of mass loss measurement, X-ray diffraction(XRD), scanning electron microscopy(SEM),and energy-dispersive spectroscopy(EDS) were used here.The experimental results show that hot corrosion kinetics follows a square power law at 650 ℃, while a linear one at 700 and 750 ℃. The corrosion layer is detected to be composed of Cr_2O_3, NiO, and Ni2S_3 at each temperature.The cross-sectional morphologies and corresponding elemental maps indicate that the corrosion layer is a stratified structure of oxide and sulfide. The results and analyses confirm that the hot corrosion mechanism of FGH96 P/M superalloy is a cooperate process of oxidation and sulfidation. Furthermore, the relatively higher concentrations of Cr, Co, and Ti provide better corrosion resistance to the attack of S and Cl^-.

关键词： nickel-based superalloy FGH96 Hot corrosion Molten salts

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Corrosion behavior of Ce-doped Ni-10Cu-11Fe-6Al(wt%) inert anode in molten CaCl_2 salt

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Journal of Rare Earths 2019年第2期37卷 218-224页

作者： Mehdi Alzamani Kourosh Jafarzadeh Arash Fattah-alhosseini Malek Ashtar University of Technology Department of Materials Engineering Bu-Ali Sina University

In this research the effect of cerium dopingon corrosion behavior of Ni-10 Cu-11 Fe-6 Al(wt%) alloy as a novel inert anode in titanium electrolytic production was investigated. The samples, including un-doped and Ce-doped nickel-based alloys, were prepared using vacuum induction melting(VIM) process and then exposed to the electrolysis in molten calcium chloride at 900C at à1.6 V versus graphite reference electrode for different immersion time. The surface and cross-section of the samples were characterized using scanning electron microscopy(SEM), and their electrochemical behavior was investigated by electrochemical impedance spectroscopy(EIS). The results show that the un-doped samples have greater number of voids and porosities as compared to that of the 0.0064 wt% Ce-doped samples(as the optimum content of cerium in the alloy). Thus, the nickel-based alloy becomes less sensitive to the pitting by addition of cerium. The corrosion penetration depth reaches about 244 mm after 16 h of electrolysis in the un-doped sample, while was approximately 103 mm for the 0.0064 wt% Ce-doped sample, which is an indication that the corrosion penetration depth decreases by adding small amounts of Ce.

关键词： Ni-10Cu-11Fe-6Al Ce doping Corrosion behavior Molten CaCl2 salt nickel-based alloy Rare earths

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