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氮气喷射成形FGH4095的组织特征

张宇 葛昌纯 沈卫平 邱成杰

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氮气喷射成形FGH4095的组织特征

张宇, 葛昌纯, 沈卫平, 邱成杰

Microstructure of spray-formed superalloy FGH4095

Zhang Yu, Ge Chang-Chun, Shen Wei-Ping, Qiu Cheng-Jie
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  • 以氮气为雾化气体采用喷射成形工艺制备了FGH4095高温合金沉积坯, 记录了沉积过程坯体表面温度曲线, 并采用定量金相法、排水法测试了坯体致密度, 观察了坯体晶粒及'相的形貌. 结果表明采用氮气作为雾化介质进行喷射成型喷射沉积坯基体致密度可达99%以上, 但也存在着较大的(12m)的气孔, 经热等静压和近等温锻后宏观气孔闭合, 氮以尺寸不超过1 m的碳氮化物形式存在. 喷射沉积坯以等轴晶组织为主, 坯体内部平均晶粒尺寸约为2040 m, 近表面区域晶粒较细, 约为13 m; 一次' 相多数呈尺寸约0.30.5 m不规则块状形貌. 喷射成形坯组织结构的形成与喷射成形过程的降温过程有密切关系.
    Spray-forming technology can produce billets with similar microstructure and higher productivity compared with the P/M process. The nickel based superalloy FGH4095 billet was produced by spray-forming with nitrogen as atomization gas. The pressure of the atomization gas and the temperature of the deposit zone were recorded. The compactness of the deposit was characterized by quantitative metallography and Archimedes method. The grain structure of substrate and the size and morphology of ' phase were observed. Results show that the density of the deposit produced by nitrogen spray forming reaches about 99% and little amount of pores with diameters about 12 m could be detected in the deposit matrix. While, pores could be enclosed by HIP and near iso-thermal forging process; Nitrogen was existed as carbonitride with diameters less than 1 m. The average grain size of the equiaxed grains in the interior of the deposit is about 2040 m, while the grains near the surface of the deposit are finer with average grain size about 13um; the primary ' phase which has diameters about 0.30.5 m possesses irregular block feature. The microstructure of the spray deposit is related to the temperature history of the alloy during the spray forming process.
    • 基金项目: 国家高技术研究发展计划(批准号: 2007AA03Z502)和国家自然科学基金 (批准号: 50974016)资助的课题.
    • Funds: Project supported by High Technology Research and Development Program of China (Grant No. 2007AA03Z502) and the National Natural Science Foundation of China (Grant No. 50974016).
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    Guo W, Wu J, Zhang F, Zhao M 2006 J. Iron. Steel. Res. Int. 13 65

    [2]

    Li Z,Zhang G Q,Zhang Z H,Liu Z W,Tian S F,Yan M G 2000 J. Aero. Mater. 20 67 (in Chinese) [李周,张国庆,张智慧,刘仲武,田世藩,颜鸣皋 2000 航空材料学报 20 67]

    [3]

    Grant P S 1995 Prog. Mater. Sci. 39 497

    [4]

    Li Z, Tian S F, Zhao X G, Liang Z K, Ren L P, Mi G F, Yan M G 1996 Acta Metall. Sin. (Engl Lett). 9 523

    [5]

    P/M High Speed Steel Research Group Iron & Steel Research Institute 1976 Collective Works of Powder Metallurgy (Vol.2) (Beijing: Iron & Steel Research Institute) p89 (in Chinese) [钢铁研究院粉末冶金高速钢组,1976 粉末冶金文集(二) (北京:钢铁研究总院) 第89页]

    [6]

    Ge C C, Yu J, Zhang Y, Shen W P 2009 The 4th International Conference on Spray Deposition and Melt Atomization Bremen, Germany, September 7-9, 2009 p29

    [7]

    Yu J, Ge C C, Meng L L, Shen W P, Yan Q Z, Meng Y D 2008 Acta Metall Sin. 44 892 (in Chinese) [于军,葛昌纯,孟璐璐,沈卫平,燕青芝,孟月东 2008 金属学报 44 892]

    [8]

    Benz M G, Sawyer T F, Carter W T, Zabala R J, Dupree P L 1994 Powd. Metal. 37 213

    [9]

    Xu W Y, Li Z, Yuan H, Zhang Y, Liu N, Zhang G Q 2010 J. Aero. Mater. 30 7 (in Chinese) [许文勇, 李周,袁华,张勇,刘娜,张国庆 2010 航空材料学报 30 7]

    [10]

    Guo J T 2008 Material Science of Superalloy (I) (Beijing: Science Press) p187 (in Chinese) [郭建亭 2008 高温合金材料学(上册) (北京:科学出版社) 第187页]

    [11]

    China Aeronautical Materials Handbook Committee Editorial 2001 China Aeronautical Materials Handbook (Vol. 5) (Beijing: China Standard Press) P31 (in Chinese) [中国航空材料手册编委会, 2001中国航空材料手册(第5卷) (北京: 中国标准出版社) 第31页]

    [12]

    He F, Wang W X, Yang W H, Zou J W, Wang X Q, Han Y F 2000 J. Aero. Mater. 20 22 (in Chinese) [何峰,汪武祥,杨万宏,邹金文,王旭青,韩雅芳 2000 航空材料学报 20 22]

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  • 收稿日期:  2012-05-07
  • 修回日期:  2012-05-10

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