冷却速率对激光熔覆K4169高温合金涂层组织的影响
Effect of Cooling Rate on Microstructure of K4169 Superalloy Coating Prepared by Laser Cladding
摘 要
采用半导体激光制备了K4169高温合金熔覆涂层, 并依次对涂层进行了固溶处理和时效处理; 采用液氮对基板冷却的方法改变覆层在凝固过程中冷却速率, 以研究冷却速率对涂层组织的影响规律; 采用扫描电镜及能谱仪对涂层组织和析出相进行分析, 采用差热分析仪对涂层析出相析出温度进行测定。结果表明: 高的冷却速率能抑制K4169合金涂层中铌元素的偏析, 同时可以抑制有害Laves相的析出; 热处理可以显著提高涂层的硬度, 高冷却速率下制备的涂层经热处理后硬度更高。
冷却速率
K4169高温合金
偏析
laser cladding
cooling rate
K4169 superalloy
segregation
Abstract
K4169 superalloy coating was fabricated using a diode laser. Solution and aging treatment were applied on the coating. During the solidification of the coating, the liquid nitrogen was used to cool the substrate to increase the cooling rate for studying the influence of the cooling rate on the microstructure of the coating. The microstructure and the precipitation phase in the coating were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy. The precipitation temperatures of the phases were measured by differential thermal analysis (DTA). Results show that high cooling rate inhibited the segregation of Nb and precipitation of harmful Laves phase in superalloy K4169 coating. The microhardness of the coating was improved by the heat treatment, and the high cooling rate facilitated the improvement of the micro-hardness of the coating.
中图分类号 TG144
所属栏目 试验研究
基金项目 科技部国际科技合作基金资助项目(2009DFB50350)
收稿日期 2011/10/17
修改稿日期 2012/7/21
网络出版日期
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备注刘洪刚(1987-), 男, 山东潍坊人, 硕士研究生。
引用该论文: LIU Hong-gang,LI Zhu-guo,HUANG Jian,NIE Pu-lin,ZHANG Yao-cheng,WU Yi-xiong. Effect of Cooling Rate on Microstructure of K4169 Superalloy Coating Prepared by Laser Cladding[J]. Materials for mechancial engineering, 2012, 36(12): 21～24
刘洪刚,李铸国,黄坚,聂璞林,张尧成,吴毅雄. 冷却速率对激光熔覆K4169高温合金涂层组织的影响[J]. 机械工程材料, 2012, 36(12): 21～24
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【2】QI H, AZER M, RITTER A.Studies of standard heat treatment effects on microstructure and mechanical properties of laser net shape manufactured Inconel 718 [J]. Metallurgical and Materials Transactions A,2009,40:2410-2422.
【3】DUPONT J N, ROBINO C V, MARDER A R,et al.Solidification of Nb-bearing superalloys:part Ⅱ.Pesudoternary solidification surfaces [J]. Metallurgical and Materials Transactions A,1998,29:2797-2806.
【4】DUPONT J N, ROBINO C V, MARDER A R.Modeling solute redistribution and microstructural development in fusion welds of Nb-bearing superalloys [J]. Acta Mater,1998,46:4781-4790.
【5】SEXTON L, LAVIN S, BYRNE G,et al.Laser cladding of aerospace materials [J]. Journal of Material Processing Technology,2002,122:63-68.
【6】DUBOURG L, ARCHAMBEAULT J.Technological and scientific landscape of laser cladding process in 2007 [J]. Surface ﹠ Coatings Technology,2008,202:5863-5869.
【7】CLARK D, BACHE M R, WHITTAKER M T.Shaped metal deposition of a nickel alloy for aero engine applications [J]. Journal of Materials Processing Technology,2008,203:439-448.
【8】ZHAO X M, CHEN J, LIN X,et al.Study on microstructure and mechanical properties of laser rapid forming Inconel 718 [J]. Materials Science and engineering A,2008,478:119-124.
【9】ANTONSSON T, FREDRIKSSON F.The effect of cooling rate on the solidification of Inconel 718 [J]. Metallurgical and Materials Transactions B,2005,36:85-96.
【10】RADHAKRISHNA C H, PRASAD R K.The formation and control of Laves phase in superalloy 718 welds [J]. Journal of Materials Science,1997,32:1977-1984.
【11】SIVAPRASAD K, GANESH SUNDARA RAMAN S.Influence of weld cooling rate on microstructure and mechanical properties of alloy 718 weldments[J]. Metallurgical and Materials Transactions A,2008,39:2115-2127.
【12】赵卫卫,林鑫,刘奋成,等.热处理对激光立体成形Inconel 718高温合金组织和力学性能的影响 [J]. 中国激光,2009,36(12):3220-3225.
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