维普中文期刊产品整合服务

Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming

查看全文 作　　者：Shiwei [1,2]Ci;Jingjing [1,3,4]Liang;Jinguo [1,4]Li;Yizhou [1]Zhou;Xiaofeng [1]Sun 高影响力作者 机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang J10016,China;[2]School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China;[3]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;[4]Space Manufacturing Technology(CAS Key Lab),Beijing 100094,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2020年第42卷第10期,共12页高影响力期刊 基　　金：the National Key R&D Program of China(No.2018YFB1106600),the National Key R&D Program of China(Nos.2017YFA0700703 and 2018YFB1106000);the National Natural Science Foundation of China(NSFC)(Nos.51771190,51671189,U1508213);the National High Technology Research and Development Program(“863”)(No.2014AA041701);the Fund of the State Key Laboratory of Solidification Processing in NWPU(No.SKLSP201834)。 摘　　要：In this work,the microstructure and tensile properties of DD32 single-crystal(SC)superalloy repaired by laser metal forming(LMF)using pulsed laser have been studied in detail.The microstructures of the deposited samples and the tensile-ruptured samples were characterized by optical microscopy(OM),transmission electron microscope(TEM)and scanning electron microscope(SEM).Due to high cooling rate,the primary dendrite spacing in the deposited area(17.2μm)was apparently smaller than that in the substrate area(307μm),and the carbides in the deposited samples were also smaller compared with that in the substrate area.The formation of(γ+γ’)eutectic in the initial layer of repaired SC was inhibited because of the high cooling rate.As the deposition proceeded,the cooling rate decreased,and the(γ+γ’)eutectic increased gradually.The(γ+γ’)eutectic at heat-affected zone(HAZ)in the molten pool dissolved partly because of the high temperature at HAZ,but there were still residual eutectics.Tensile test results showed that tensile behavior of repaired SC at different temperatures was closely related to the MC carbides,solidification porosity,γ’phase,and(γ+γ’)eutectic.At moderate temperature,the samples tested fractured preferentially at the substrate area due to the fragmentation of the coarse MC carbide in the substrate area.At elevated temperature,the(γ+γ’)eutectic and solidification porosity in the deposited area became the source of cracks,which deteriorated the high-temperature properties and made the samples rupture at the deposited area preferentially. 关 键 词：DD32 PULSED-LASER Repairing Single-crystal superalloy MICROSTRUCTURES Tensile property
相关文献

参考文献(35)

引证文献(12)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费