面向大厚度及高强度的铁基—碳化钨梯度材料熔射成形及性能控制

项目来源

国家自然科学基金(NSFC)

项目主持人

陈颢

项目受资助机构

江西理工大学

项目编号

51464013

立项年度

2014

立项时间

未公开

研究期限

未知 / 未知

项目级别

国家级

受资助金额

49.00万元

学科

工程与材料科学-矿业与冶金工程-材料冶金加工

学科代码

E-E04-E0414

基金类别

地区科学基金项目

关键词

铁基—碳化钨粉末 ; 梯度材料 ; 性能控制 ; 高强度 ; 熔射成形 ; gradient material ; Fe-WC powder ; spray forming ; property control ; high strength

参与者

郭圣达;王操;张雪辉;伍方;叶育伟;熊伟

参与机构

江西理工大学;江西应用技术职业学院

项目标书摘要:针对熔射成形零件成形精度和性能亟待提高这一关键科学问题,本项目通过成分设计和多路同步送粉交错沉积,改变成分和微结构的梯度分布实现其强韧化;基于成形机理,进一步探究等离子束加热过程中温度历史和空间的分布,分析不同加工工艺参数条件下熔射成形零件的变形规律的映射关系,推导影响等离子熔射成形结构形状的主要因素,探讨其主要工艺参数包括输出功率、送粉量和扫描速度与成形结构几何特征之间的定量关系,建立等离子熔射成形的一般工艺过程,形成等离子熔射成形结构形状预测模型,并与实际试验结果对比验证,实现预期形状结构的等离子熔射快速成形及其形状控制,提高零件成形精度和力学性能,为铁基—碳化钨梯度材料熔射成形质量控制提供理论和试验依据。

Application Abstract: Plasma spray forming is a method of direct rapid metal manufacturing and tooling,it can sharply shorten the lead-time,reduce the cost of product and shape up full-density metal die.Because a lot of factors disturb the processing of plasma spray forming,these is a long way to go to improve the precision of production.The project through the composition design and the multi-channel synchronous powder feeding inter-deposition,changes the composition and the gradient distribution and post-processing of microstructure to control the residual stress distribution and to achieve the strengthening and toughening of the deposits.Used embedded microprocessor ARM and external signal conditioning circuit as the hardware of the deposition control,and used the embedded software platform as the development of under-control software,which have a high performance in data processing and the implementation of logic function.The theoretical models of the plasma spray forming process and the characteristics of gradient coating such as its size,thickness and deposition rate are established by using acoustic emission technology for the online monitoring of crack,combined with the infrared pyrometer for the observation of bath temperature changes.The function between mainly processing parameters,such as plasma jet power,scanning speed and powder feeding rate,and laser formed structure geometry is been built.A dimensional prediction model is been built based on energy conservation principle and equation of mass conservation of laser molten-pool.Upon the completion of the project,it can provide the coagulation control of the basic theory and technology,and the theoretical basis of the plasma spray forming.

项目受资助省

江西省

项目结题报告(全文)

针对熔射成形零件成形精度和性能亟待提高这一关键科学问题,本项目通过成分设计和多路同步送粉交错沉积,改变成分和微结构的梯度分布实现其强韧化;基于成形机理,进一步探究等离子束加热过程中温度历史和空间的分布,分析不同加工工艺参数条件下熔射成形零件的变形规律的映射关系,推导影响等离子熔射成形结构形状的主要因素,探讨其主要工艺参数包括输出功率、送粉量和扫描速度与成形结构几何特征之间的定量关系,建立等离子熔射成形的一般工艺过程,形成等离子熔射成形结构形状预测模型,并与实际试验结果对比验证,实现预期形状结构的等离子熔射快速成形及其形状控制,提高零件成形精度和力学性能,为铁基—碳化钨梯度材料熔射成形质量控制提供理论和试验依据。

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  • 1.原位碳化快速烧结WC-6Co硬质合金工艺研究

    • 关键词:
    • WC-Co硬质合金;原位碳化快速烧结;碳含量;烧结温度;组织结构
    • 郭圣达,;鲍瑞;易健宏
    • 《《中国钨业》创刊三十周年钨业发展报告会暨六届五次理事会》
    • 中国北京
    • 会议

    以钨粉、钴粉、碳黑、有机碳为原料,研究了W、Co和C混合粉末在放电等离子烧结系统中碳化反应快速烧结制备WC-6 wt.%Co硬质合金的原位碳化烧结工艺。系统研究了配碳量、烧结温度和加压方式对硬质合金的显微组织结构和性能的影响。结果表明:碳含量为理论值1.2倍时合金物相为纯WC和Co相,无脱碳相,也未发现游离碳;烧结温度在1 250℃时,WC晶粒均匀且无异常长大;在W、Co和C混合粉末烧结初期施加30 Mpa压强,待温度升到800℃时再将压强加到50 MPa制备的合金孔隙较少,致密化程度高。本工艺较传统制备工艺具有流程短,成本低的特点,可为硬质合金工业生产提供参考。

    ...
  • 2.Microstructure and properties of Fe base coatings reinforced by in-situ TiC particles using plasma jet surface metallurgy

    • 关键词:
    • Chromium compounds;Low carbon steel;X ray diffraction;Composite coatings;Fighter aircraft;Microhardness;Wear resistance;Interfaces (materials);Strengthening (metal);Titanium alloys ;Indium compounds;Iron;Scanning electron microscopy;Microstructure;Plasma jets;Reinforcement;Carbon steel substrates;Dispersion strengthening;Energy dispersive x-ray;Fe-based coatings;In-situ synthesized;Jet surfaces;Microstructure and properties;Particulate reinforcements
    • Chen, Hao;Zhang, Yangrong;Huang, Zhu
    • 《Chinese Materials Conference on Special and High Performance Structural Materials, CMC 2015》
    • 2016年
    • July 10, 2015 - July 14, 2015
    • Guiyang, China
    • 会议

    By plasma jet surface metallurgy, the thick composite coatings reinforced by in-situ TiC were produced on low carbon steel. Composition, microstructures and performance were characterized by scanning electron microscope (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), micro-hardness tester and wear tester. The results showed that the excellent bonding between the coating and the carbon steel substrate was achieved by strong metallurgical interface. The microstructure of the coating is mainly composed of γ-(Fe, Ni) dendrite, M23C6, CrB and in-situ synthesized TiC ceramic particle. Because of the particulate reinforcement, the dispersion strengthening, refinement strengthening, micro-hardness and wear resistant of Fe-based coating can be enhanced.
    © 2016 Trans Tech Publications, Switzerland.

    ...
  • 3.Wear and corrosion properties of crystalline Ni-W alloy coatings prepared by electrodeposition

    • 关键词:
    • Nickel coatings;Sulfur compounds;Tungsten alloys;Binary alloys;Corrosion resistance;Heat treatment;Nickel compounds;Tungsten compounds;Heat resistance;Microhardness ;Corrosive effects;Microstructure;Sodium chloride;Wear resistance;Corrosion resistant coatings;Annealing temperatures;Elctrodeposition;Heat treatment temperature;Heat-treated coatings;Medium carbon steel substrate;Microhardness tester;Ni-W alloy;Sodium chloride solution
    • Chen, Hao;Ren, Xingrun;Zhang, Xuehui;Li, Jinhui
    • 《Chinese Materials Conference on Special and High Performance Structural Materials, CMC 2015》
    • 2016年
    • July 10, 2015 - July 14, 2015
    • Guiyang, China
    • 会议

    Electroplating Ni-W coatings have been prepared on medium carbon steel substrate by using nickel sulphate and sodium tungstate as precursors. The microstructures, phase compositions and performances of the as-prepared coatings were analyzed by SEM, EDS, AFM, XRD, microhardness tester and wear tester, respectively. The surface morphologies after wearing were observed and the wear mechanism was discussed. The corrosion behaviors of the coatings before and after heat-treatments were evaluated by anodic polarization in 3.5% sodium chloride solution. The results show that no obvious flaws could be found in the Ni-W alloy coatings and there was a good bond with the matrix. The microhardness of the coatings increased with increasing heat treatment temperature, reaching its maximum value for heat treatment at 500°C, and then droped down. Wear resistance of the coatings was found to be better than that of 16 Mn steel and the heat treatment improved the hardness and wear resistance. The corrosion resistance of the heat-treated coatings increased with increasing the annealing temperature, and best corrosion resistance could be obtained at the temperature of 500°C.
    © 2016 Trans Tech Publications, Switzerland.

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