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Effect of Al and Si additions on microstructure and mechanical properties of TiN co.tings

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Journal of Central South University 2011年第2期18卷 310-313页

作者：王社权陈康华陈利祝昌军李屏杜勇 State Key Laboratory of Powder Metallurgy Central South University zhuzhou cemented carbide cutting tools co. Ltd

Ti-X-N (X=Al,Si or Al+Si) co.tings were grown onto cemented carbide substrates by cathodic arc evaporation. The hardness of the co.tings was obtained by nanoindentation and the microstructure was investigated by XRD,XPS and SEM. Solid solution hardening results in a hardness increase from 24 GPa for TiN to 31.2 GPa for TiAlN. The higher hardness values of 36.7 GPa for TiSiN and 42.4 GPa for TiAlSiN are obtained by the inco.poration of Si into TiN (TiAlN) co.tings due to the formation of special three-dimensional net structure co.sisting of nanocrystalline (nc) TiN (TiAlN) encapsulated in an amorphous (a) Si3N4 matrix phase. Furthermore,the nc-TiAlN/a-Si3N4 co.ting shows the best machining performance.

关键词： TiN co.ting alloying element hardness cutting test

Effect of Radial Depth on Vibration and Surface Roughness During Face Milling of Austenitic Stainless Steel

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Transactions of Tianjin University 2011年第5期17卷 336-339页

作者：申阳陈永洁张俐方海涛庞佳刘敏王社权马晓魁张京刘志林 School of Mechanical Science and Engineering Huazhong University of Science and Technology zhuzhou cemented carbide cutting tools co. Ltd

This paper studies the influence of radial depth on vibration, chip formation and surface roughness during face milling of AISl3O4 austenitic stainless steel with indexable cemented carbide milling cutters. The amplitude of vibration acceleration increased with the increasing radial depth up to 80 mm. And the domain vibration frequency varied with the radial depth. In this paper, three types of chips were found： C shape, long shape and spiral shape. The minimum surface roughness value occurred when the radial depth equalled 40 mm in the experiment. Irregular changes of chip curl radius and chip thickness co.ld be attributed to different numbers of alternately engaged teeth when the feed and speed were fixed. Surface roughness is related to forced vibration and chip formation. Radial depth with different numbers of alternately engaged teeth co.ld significantly influence the forced vibration, chip formation, and surface roughness.

关键词： austenitic stainless steel face milling radial depth vibration surface roughness chip formation

Microstructure and physical properties of PVD TiN/(Ti, Al)N multilayer co.tings

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中国有色金属学会会刊：英文版 2005年第5期15卷 1072-1076页

作者：吴恩熙陈利尹飞汪秀全 State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Zhuzhou Cemented Carbide Cutting Tools Co. LTD Zhuzhou 412007 China

Magnetron sputtered (Ti, Al)N monolayer and TiN/(Ti, Al)N multilayer co.tings grown on cemented carbide substrates were studied by using energy dispersive X-ray spectrosco.y (EDX), scanning electron microsco.y(SEM), nanoindentation, Rockwell A indentation test, strength measurements and cutting tests. The results show that the (Ti, Al)N monolayer and TiN/(Ti, Al)N multilayer co.tings perform good affinity to substrate, and the TiN/(Ti, Al)N multilayer co.ting exhibits higher hardness, higher toughness and better cutting performance co.pared with the (Ti, Al)N monolayer co.ting. Moreover, the strength measurement indicates that the physical vapour deposition (PVD) co.ting has no effect on the substrate strength.

关键词：钛锡多层结构涂层微观结构物理性能金属表面防护

Microstructure, mechanical properties, and milling performance of arc-PVD AlTiN–Cu and AlTiN/AlTiN–Cu co.tings

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Journal of Central South University 2018年第3期25卷 506-515页

作者： CHEN Hao CHEN Kang-hua XU Yin-chao PAN Chen-xi YI Ji-yong ZHU Chang-jun State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China zhuzhou cemented carbide cutting tools co.ltd. Zhuzhou 412000China

AlTiN,AlTiN–Cu and AlTiN/AlTiN–Cu co.tings were prepared on WC–6%co.substrates by cathode arc evaporation deposition *** kinds of nitrogen pressures were used to deposit both AlTiN–Cu and AlTiN/AlTiN–Cu *** and cross-sectional morphologies of films were observed by scanning electron microsco.y(SEM).Crystal structure of films was analyzed by X-ray diffraction(XRD)and X-ray photoelectron spectrosco.y(XPS).Hardness and adhesion of films were measured by nano-indentation and nano-scratch *** tests were performed under milling co.ditions during wet machining of TC4 *** results show that with addition of Cu,more droplets occur on AlTiN co.ting surface,but the grain size of it is refined,and the hardness decreases but the toughness is *** higher N2 pressure,the defects on the surface of AlTiN–Cu and AlTiN/AlTiN–Cu co.tings diminish,and the hardness of them is enhanced,while the adhesion is *** to AlTiN co.ted cemented carbide tool,the lifetimes of AlTiN–Cu and AlTiN/AlTiN–Cu co.ted tools under the same N2 pressure are improved by 11%and 24%,respectively.

关键词： co.ted cemented carbide AlTiN–Cu AlTiN/AlTiN–Cu N2 pressure milling

cutting Performance and Wear Behavior of AITiN-and TiAlSiN-co.ted carbide tools During Dry Milling of Ti-6Al-4V

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Acta Metallurgica Sinica(English Letters) 2020年第3期33卷 459-470页

作者： Jie Liu Shui-Sheng Zhu Xin Deng Jian-Ye Liu Zhong-Ping Wang Zhi Qu School of Electromechanical Engineering University of Technology Guangzhou 510006China School of Electromechanical Engineering Guangzhou Panyu PolytechnicGuangzhou 511483China Guangdong Hanbang 3d Technology co. Ltd.Zhongshan 528427China Heyuan Fuma cemented carbide co. Ltd.Heyuan 517583China Guangdong Fenghua Zhuoli Technology co. Ltd.Foshan 528225China

Machining,especially dry machining of titanium alloys,has been one of the most significant challenges for carbide cutting *** this study,aluminum-rich AlTiN co.ting,as well as TiAlSiN nanoco.posite co.ting,were successfully employed for dry milling of Ti-6 A1-4 V alloy with high efficiency and long tool *** the cutting speeds of 150 m/min and 200 m/min,the tool life of the TiAlSiN-co.ted tool exceeds that of AlTiN-co.ted tool by 32 and 66%,*** wear modes for both co.ted tools include the uniform flank wear,smooth wear,chipping,co.ting and substrate flaking,crater and notch wear,and the wear mechanisms include adhesion,diffusion,oxidation and *** them,the wear mechanism is dominated by the adhesion and oxidation *** co.pared with AlTiN co.ting,TiAlSiN co.ting exhibits better mechanical properties and oxidation resistance,which co.tribute to a better cutting performance,fewer thermal cracks and smaller and uniform workpiece chips during the dry milling of Ti-6 A1-4 V alloy.

关键词： cutting performance Wear behavior Ti-6Al-4V AlTiN co.ting TiAlSiN co.ting

Effect of jet milling on micro-strain behavior and rupture behavior of agglomerates of ultrafine WC powders

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Transactions of Nonferrous Metals Society of China 2019年第10期29卷 2128-2140页

作者： Ya-li SUN Qing-cai LIU Xin HUANG Fa-xing ZHANG Jian YANG Hua MEI co.lege of Materials Science and Engineering Chongqing UniversityChongqing 400044China co.lege of Materials Science and Engineering Sichuan University of Science and EngineeringZigong 643000China co.lege of Chemical Engineering Sichuan University of Science and EngineeringZigong 643000China zhuzhou cemented carbide cutting tools co. Ltd.Zhuzhou 412007China

The Williamson-Hall and uniaxial co.pression methods were used to study the variations of the micro-strain and stress-strain relations in WC powders after jet milling and ball milling, respectively. The rupture behavior of agglomerates in WC powders was investigated. Meanwhile, the as-obtained WC powders treated by different milling methods were used to fabricate WC-10%co.cemented carbides, followed by the performance assessment of cemented carbides. The results show that the micro-strain of the jet-milled WC powders decreases significantly co.pared with that of the ball-milled WC powders, and that the cemented carbides prepared by jet-milled WC powders exhibit excellent properties with a transverse-rupture strength of 4260 MPa, due to the elimination of agglomerates and the reduction of lattice strain.

关键词： ultrafine WC powder micro-strain stress-strain relation jet milling agglomerate rupture mechanism

Thermal behavior and structure of Fe_(84)Nb_7B_9 nanocrystalline powders

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中国有色金属学会会刊：英文版 2006年第2期16卷 299-303页

作者：曹玲飞汪明朴谢丹郭明星李周谭望徐根应 School of Materials Science and Engineering Central South University Changsha 410083 China School of Materials Science and Engineering Central South University Changsha 410083 China Zhuzhou Cemented Carbide Group Co Ltd Zhuzhou 412000 China School of Materials Science and Engineering Central South University Changsha 410083 China Department of Science and Technology of Anhui Province Hefei 2300 01 China

The thermal behavior of Fe84Nb7B9 nanocrystalline powders were analyzed by DTA, XRD and TEM measurements. The results show that nanocrystalline powders with grain size of less than 10 nm can be prepared by mechanical alloying. After annealed below 770 ℃, the obtained powders remain in the scale of nanometer without new phases formed, exhibiting good thermal stability. On its DTA curve, a wide temperature interval of 450 ℃ between its two exothermic peaks can be observed. The powders in as-milled state has bcc structure of supersaturated solid solution type, and nanocrystalline together with amorphous phases can be observed in the powder annealed at 350 ℃, which is beneficial for the good soft magnetic properties.

关键词： Fe84Nb7B9 纳米晶非晶态合金热分析结构

Microstructure, mechanical and co.rosion properties of electron-beam-melted and plasma-transferred arc-welded WC_P/NiBSi metal matrix co.posites

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Rare Metals 2019年第9期38卷 814-823页

作者： Chang Liu Hui Peng Yue Zhao Yuan Yuan Hong-Bo Guo Hui-Bin Xu School of Materials Science and Engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology Beihang UniversityBeijng 100191China Key Laboratory of Aerospace Materials&Performance(Ministry of Education) Beihang UniversityBeijng 100191China School of Mechanical Materials and Mechatronic Engineering Faculty of Engineering and Information SciencesUniversity of WollongongWollongongNSW 2522Australia zhuzhou Seed cemented carbide Technology co.ltd Zhuzhou 412000China

As one of the new additive manufacturing processes,electron beam melting(EBM)has seen its promising potential in the fabrication of metal matrix co.posites(MMCs)co.ponents with co.plex *** this work,WC_P/NiBSi MMCs were fabricated by EBM and plasma-transferred arc welding(PTAW)for a co.parative *** microstructures of both samples were examined using a scanning electron microsco.e(SEM)equipped with an electron backscattered diffraction(EBSD)*** macrohardness was tested using a Rockwell hardness method(Type C),while the microhardness was measured using different loadings(0.5-1.0 N)based on different *** anti-abrasion performance was tested as per the ASTM G105 *** co.rosion behavior of the MMCs was also assessed by potentiodynamic *** results indicate that the EBM bulk and the PTAW cladding MMCs exhibit different microstructures due to the different local solidification *** is believed to lead to the varied mechanical properties and co.rosion resistance of the MMCs,and the possible mechanisms were also discussed.

关键词： Electron beam melting Metal matrix co.posites Microstructure carbides Additive manufacturing