涂覆Ni-Cr-Al-Y涂层的镍基高温合金热机械疲劳行为
THERMO-MECHANICAL FJATIGUE BEHAVIOR OF Ni-BASED SUPERALLOY COATED WITH Ni-Cr-Al-Y
查看参考文献13篇
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文摘
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分别采取大气等离子(APS)和高速火焰(HVOF)工艺制备Ni-Cr-Al-_Y涂层.对涂覆Ni-C卜Al-Y涂层的高温合金试样的热机械疲劳(TMF)行为进行了研究.结果表明:在相同应变幅下,2种涂层试样都是反相位热机械疲劳(OP TMF)寿命比同相位热机械疲劳(IP TMF)寿命短;在不同应变幅下,试样的热机械疲劳寿命与涂层的喷涂工艺相关.通过断I=I和纵向剖面图的观察分析表明,裂纹的萌生对试样的寿命有很大的影响. |
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其他语种文摘
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Gas turbine engine is widely used in industry,marine and aerospace.Its efficiency can be enhanced by increasing inlet gas temperature and reducing heat transfer.To achieve this goal it is important to develop materials with higher melting points.Ni-based superalloy is suitable for vane and blade materials.The properties of superalloy have been improved by directionally solidified and single crystal in last 50 years.But it is limited to develop superalloy with much higher temperature,because the operating temperature approaches the melting point of superalloy.In this rigorous environment, high temperature oxidation and hot corrosion impair the alloy property.MCrAlY coating is commonly used as oxidation- and corrosion-resistant material.Hitherto,it is clearly validated that the oxidation-and corrosion-resistance of hot parts at high temperature can be greatly improved by MCrAlY coating. The difference of materials properties between MCrAlY coating and superalloy may cause interactions which influence the mechanical properties and life of MCrAlY-coated component.A few of studies have conducted on mechanical properties of MCrAlY-coated superalloy.The results revealed that the present of coating affected the performance of superalloy.In service,thermo-mechanical fatigue provides a closer simulation of the actual strain-temperature in an engine environment.Only a few studies were published though their results were not consistency;because the experiment is hard to perform and many factors influence the experiment results such as temperature-strain cycle shape,strain range magnitude,the ductility and the strength of the bond between the coating and the substrate. In this paper,thermo-mechanical fatigue(TMF) behaviors of a Ni-based superalloy M963 coated with Ni-Cr-Al-Y have been investigated at 450—900℃in air under mechanical strain control with a strain ratio of -1 and a period of 200 s.The coating was produced either by air plasma spraying(APS) or by high velocity oxyfuel fuel(HVOF).It was shown that under the same mechanical strain,the out of phase(OP) TMF life is shorter than the in phase(IP) TMF one in both APS and HVOF coated specimens.The TMF life depends on the coating spraying technology under the same testing conditions.Observations of fracture surfaces and longitudinal sections revealed that crack initiation has great impact on the TMF life. |
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来源
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金属学报
,2009,45(7):820-825 【核心库】
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关键词
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镍基高温合金
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Ni-Cr-Al-Y涂层
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热机械疲劳
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裂纹萌生与扩展
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地址
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1.
中国科学院金属研究所, 沈阳材料科学国家(联合)实验室, 辽宁, 沈阳, 110016
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Department of Intelligent Mechanical Engineering,Fukuoka Institute of Technology, Japan, Fukuoka
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0412-1961 |
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学科
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金属学与金属工艺;航空 |
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基金
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沈阳界面材料研究中心海外学者计划资助项目
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文献收藏号
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CSCD:3664574
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