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Microstructure and properties of nano-TiN modified Ti(C,N)-based cermets fabricated by powder injection molding and die pressing

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1115-1121页

作者： Shan-jie Yi Hai-qing Yin Ke Chen Dil-Faraz Khan Qing-jun Zheng Xuan-hui Qu School of Materials Science and Engineering University of Science and Technology Beijing Department of Physics University of Science and Technology Bannu kennametal inc. 1600 Technology Way Latrobe

Powder injection molding （PIM） and die pressing were employed to fabricate nano-TiN modified Ti（C,N）- based cermets. The shrinkage behavior, microstructure, porosity, and mechanical properties of the samples with and without nano-TiN addition fabricated by PIM and die pressing were analyzed. It is demonstrated that for either PIM or die pressing, the porosities are obviously reduced, the mechanical properties are significantly improved after adding nano-TiN, and the hard particles are refined; the rim phase thickness obviously becomes thinner, and the number of dimples in fracture also inc.eases. Compared the samples fabricated by die pressing, it is difficult for PIM to obtain dense Ti（C,N）-based cermets. Due to the too much existence of pores and isolated carbon, the mechanical properties of the sintered samples by PIM are inferior to those of the sintered ones by die pressing.

关键词： cermets powder injection molding die pressing titanium nitride nanoparticles mechanical properties

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刀具创新对提高金属切削效率的作用与影响

工具技术 2005年第12期39卷 3-10页

作者： M S Greenfield A T Santhanam 胡红兵 kennametal inc.

世界范围内激烈的市场竞争迫使机械制造业降低成本以保持盈利。由于加工成本的主要部分是占用机床时间的费用,因此目前人们的注意力集中在通过提高加工生产率以缩短加工周期。机床的改进,性能更优异的零件材料的开发,新的加工方法的开... 详细信息

世界范围内激烈的市场竞争迫使机械制造业降低成本以保持盈利。由于加工成本的主要部分是占用机床时间的费用,因此目前人们的注意力集中在通过提高加工生产率以缩短加工周期。机床的改进,性能更优异的零件材料的开发,新的加工方法的开发以及涉及切削液安全处理的环保法规的制订等,都给刀具行业带来了新的挑战。为了回应这些挑战,刀具行业对各种刀具材料进行了卓有成效的创新。本文重点讨论刀具技术的进步对提高金属切削生产率所起的作用。

关键词：切削刀具硬涂层表面工程金属切削生产率刀具几何形状

The Impact of Cutting Tool Advances on Machining Productivity

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工具技术 2006年第3期40卷 13-21页

作者： M. S. Greenfield A.T. Santhanam kennametal inc. Latrobe PA 15650 USA

Intense global competition is forcing the manufacturing industry to reduce costs so as to maintain profitability. Sinc. a major component of manufacturing cost is machine tool time, attention is focused on cycle time reduction through greater machining productivity. Advances in machine tools, development of stronger workpiece materials, new machining methods, and environmental regulations with regard to safe disposal of cutting fluids are providing additional challenges to the cutting tool industry. In response to these challenges, the industry has made significant innovations in every class of tool materials. This paper discusses the role of tooling advances in enhancing metalcutting productivity.

关键词：机械制造切割工具技术发展

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Al含量对TiAlN涂层热稳定性能的影响

中南大学学报（自然科学版） 2013年第7期44卷 2696-2701页

作者：张雨萌朱丽慧倪旺阳刘一雄上海大学材料科学与工程学院 kennametal inc. LatrobePA 15650USA

采用阴极电弧蒸镀在WC-Co硬质合金基体上沉积Ti1-xAlxN涂层（x=0.5、0.55和0.6）,并对涂层试样在900℃下真空退火0.5-4 h。采用X线衍射仪（XRD）和显微维氏硬度计分析比较退火前后TiAlN涂层物相及硬度,研究Al含量对涂层结构、硬度和热... 详细信息

采用阴极电弧蒸镀在WC-Co硬质合金基体上沉积Ti1-xAlxN涂层（x=0.5、0.55和0.6）,并对涂层试样在900℃下真空退火0.5-4 h。采用X线衍射仪（XRD）和显微维氏硬度计分析比较退火前后TiAlN涂层物相及硬度,研究Al含量对涂层结构、硬度和热稳定性能的影响。研究结果表明：Ti0.5Al0.5N和Ti0.45Al0.55N为单相面心立方结构,Ti0.4Al0.6N为面心立方（fcc）TiAlN和密排六方（hcp）AlN双相结构。涂层退火时发生分解,先析出介稳相fcc-AlN,再转变为稳定相hcp-AlN和fcc-TiN,硬度逐渐下降。Ti0.45Al0.55N涂层高温下能保持较长时间的稳定,退火后仍具有最高的硬度,表现出优异的热稳定性;而Ti0.4Al0.6N涂层中因存在hcp-AlN硬度略低,分解最早,热稳定性最差。当x=0.55时为最佳涂层成分。

关键词： TiAlN涂层阴极电弧蒸镀热稳定性相结构硬度

Effect of Mn doping on mechanical properties and electronic structure of WCoB ternary boride by first-princ.ples calculations

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Chinese Physics B 2018年第10期27卷 537-547页

作者： Tong Zhang Hai-Qing Yin Cong Zhang Xuan-Hui Qu Qing-Jun Zheng Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Materials Genome Initiative University of Science and Technology Beijing Beijing 100083 China kennametal inc 1600 Technology Way PA 15650 USA

The first-princ.ples calculations are performed to investigate the structural, mechanical property, hardness, and electronic structure of WCoB with 0, 8.33, 16.67, 25, and 33.33 at.% Mn doping content and W_2 CoB_2 with 0, 10, and 20 at.%Mn doping content. The cohesive energy and formation energy indicate that all the structures can retain good structural stability. According to the calculated elastic constants, Mn is responsible for the inc.ease of ductility and Poisson＇s ratio and the decrease of Young＇s modulus, shear modulus, and bulk modulus. By using the population analysis and mechanical properties, the hardness is characterized through using the five hardness models and is found to decrease with the Mn doping content inc.easing. The calculated electronic structure indicates that the formation of a B–Mn covalent bond and a W–Mn metallic bond contribute to the decreasing of the mechanical properties.

关键词： Mn doping WCoB electronic structure first-princ.ples calculations

Effect of 10% Si addition on cathodic arc evaporated TiAlSiN coatings

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Transactions of Nonferrous Metals Society of China 2016年第6期26卷 1638-1646页

作者：朱丽慧宋诚倪旺阳刘一雄上海大学材料科学与工程学院上海200072 kennametal inc. 1600 Technology WayLatrobePA 15650USA Stryker Orthopaedics 325 Corporate DriveMahwahNJ 07430USA

The effect of 10% Si （mole fraction） addition on TiAlSiN coatings was studied. Ti0.5Al0.5N, Ti0.5Al0.4Si0.1N and Ti0.55Al0.35Si0.1N coatings were deposited on WC？Co substrates by cathodic arc evaporation. The microstructure and mechanical properties were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, scanning electron microscopy （SEM）, nano-indentation measurement and scratch test. The mechanisms of how Si affects the properties and failure modes of TiAlSiN coatings were also discussed. The results show that the addition of 10% Si results in the formation of nc-（Ti,Al,Si）N/a-Si3N4 nano-composite structure. The hardness and toughness of TiAlSiN coatings inc.ease, whereas the coating adhesion strength decreases. Compared with Ti0.55Al0.35Si0.1N coating, Ti0.5Al0.4Si0.1N coating has higher hardness but lower toughness. The dominant failure mode of TiAlN coating is wedging spallation due to low toughness and strong interfacial adhesion. The dominant failure mode of TiAlSiN coatings is buckling spallation due to improved toughness and weakened interfacial adhesion.

关键词： TiAlSiN coating TiAlN coating cathodic arc evaporation adhesion strength

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PVD制备TiAlSiN涂层的研究进展

材料导报 2014年第3期28卷 42-44,74页

作者：彭笑朱丽慧 Vineet Kumar 刘一雄上海大学材料科学与工程学院上海200072 kennametal inc. Latrobe PA 15650 USA

概述了物理气相沉积(PVD)技术制备TiAlSiN涂层的研究现状及发展趋势,详细分析了Si元素的添加及Si与Al元素的含量对TiAlSiN涂层的微观结构、力学性能、高温抗氧化性和热稳定性的影响。解决PVD制备TiAlSiN涂层较低的膜基结合力和较大的残... 详细信息

概述了物理气相沉积(PVD)技术制备TiAlSiN涂层的研究现状及发展趋势,详细分析了Si元素的添加及Si与Al元素的含量对TiAlSiN涂层的微观结构、力学性能、高温抗氧化性和热稳定性的影响。解决PVD制备TiAlSiN涂层较低的膜基结合力和较大的残余应力等问题应是今后重点研究的方向。

关键词：物理气相沉积 TiAlSiN涂层微观结构力学性能抗氧化性热稳定性

基于回归法的钛合金(Ti-6Al-4V)插铣铣削力建模分析

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北京工业大学学报 2006年第8期32卷 737-740页

作者：秦旭达赵剑波张剑刚刘焕领 Tom O Muller Ni Wang-yang Liu Yi-xiong 天津大学机械工程学院天津300072 kennametal Inc I.atrobe PA 15650 USA

针对钛合金(Ti-6Al-4V)的切削特点,研究了具有高速、高效特点的Ti-6Al-4V的插铣过程,分析了切削力的特点,构建了切削力分析试验平台,对铣削力的变化规律进行了研究,采用Taguchi正交试验法,运用多元线性回归法进行数值拟合,建立Ti-6Al-4... 详细信息

针对钛合金(Ti-6Al-4V)的切削特点,研究了具有高速、高效特点的Ti-6Al-4V的插铣过程,分析了切削力的特点,构建了切削力分析试验平台,对铣削力的变化规律进行了研究,采用Taguchi正交试验法,运用多元线性回归法进行数值拟合,建立Ti-6Al-4V插铣过程铣削力模型．经试验验证,该模型是有效的,铣削力误差在10%以内,为研究钛合金插铣过程提供了依据．

关键词：钛合金插铣铣削力

A novel approach to predict green density by high-velocity compaction based on the materials informatics method

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International Journal of Minerals,Metallurgy and Materials 2019年第2期26卷 194-201页

作者： Kai-qi Zhang Hai-qing Yin Xue Jiang Xiu-qin Liu Fei He Zheng-hua Deng Dil Faraz Khan Qing-jun Zheng Xuan-hui Qu Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing Key Laboratory of Materials Genome Engineering Beijing Laboratory of Metallic Materials and Processing for Modern Transportation School of Mathematics and Physics University of Science and Technology Beijing Chongqing Engineering Technology Research Center for Light Alloy and Processing Department of Physics University of Science and Technology Bannu kennametal inc

High-velocity compaction is an advanced compaction technique to obtain high-density compacts at a compaction velocity of ≤10 m/s. It was applied to various metallic powders and was verified to achieve a density greater than 7.5 g/cm^3 for the Fe-based powders. The ability to rapidly and accurately predict the green density of compacts is important, especially as an alternative to costly and time-consuming materials design by trial and error. In this paper, we propose a machine-learning approach based on materials informatics to predict the green density of compacts using relevant material descriptors, inc.uding chemical composition, powder properties, and compaction energy. We investigated four models using an experimental dataset for appropriate model selection and found the multilayer perceptron model worked well, providing distinguished prediction performance, with a high correlation coefficient and low error values. Applying this model, we predicted the green density of nine materials on the basis of specific processing parameters. The predicted green density agreed very well with the experimental results for each material, with an inaccuracy less than 2%. The prediction accuracy of the developed method was thus confirmed by comparison with experimental results.

关键词： powder metallurgy high-velocity compaction green density data mining multilayer perceptron