中国激光, 2012, 39 (2): 0203004, 网络出版: 2011-12-22   

激光熔化沉积DZ408镍基高温合金微细柱晶显微组织及性能

Microstructure and Mechanical Properties of Rapid Solidified Ultra-Fine Columnar Grain Ni-Base Superalloy DZ408 by Laser Melting Deposition Manufacturing
作者单位
北京航空航天大学大型整体金属构件激光直接制造教育部工程研究中心, 北京 100191
摘要
采用激光逐层熔化沉积工艺制备出了DZ408高温合金板状试样,分析了其激光沉积态及热处理后的显微组织,测试合金的室温拉伸力学性能并分析了其断裂机理。结果表明,激光熔化沉积(LMD) DZ408镍基高温合金沿沉积方向具有快速凝固定向生长微细柱晶组织,其一次枝晶间距约为26 μm、二次枝晶间距约为8 μm,但在枝晶尺度范围内仍存在较明显的元素枝晶偏析,枝晶间γ′尺寸大于枝晶干。顶层沉积层由定向生长微细树枝晶和非定向树枝晶组成,相遇处由于合金液补缩不足产生疏松。在激光沉积过程中选择足够的重熔率,将非定向自由生长树枝晶层和疏松区重熔,是获得致密定向微细柱状晶的必要条件。经过后续热处理,测试合金的室温抗拉强度为1507 MPa,延伸率为14.5%。
Abstract
Directionally rapid solidified Ni-base superalloy DZ408 with ultra-fine columnar grain structure is produced by the laser melting deposition (LMD) manufacturing process. Microstructure and mechanical properties of the laser melting deposited DZ408 before and after heat treatment are analyzed and tested. Results show that as-deposited microstructure is directionally solidified dendrites with the primary dendrite arm spacing of approximately 26 μm and the secondary dendrite arm spacing of approximately 8 μm . The size of γ′ in the interdendritic zones is larger than that in the dendritic cores. The undirectional columnar layer and interdendritic shrinkage should be sufficient remelted to ensure the densification and epitaxy between the depositing layer and the previous one. After proper heat treatment, the room temperature tensile strength of the DZ408 superalloy is 1507 MPa, while the elongation along the deposition direction is 14.5%.
参考文献

[1] 胡壮麒, 王华明, 张静华 等. 单晶镍基高温合金的非平衡凝固[J]. 腐蚀科学与防护技术, 1993, (1): 15~22

    Hu Zhuangqi, Wang Huaming, Zhang Jinghua et al.. Nonequilibrium solidification of single crystal nickel-base superalloy[J]. Corrosion Science and Protection Technology, 1993, (1): 15~22

[2] Yu Jingjiang, Sun Xiaofeng, Guan Hengrong et al.. Influence of heat treatment on the microstructure and mechanical properties of DZ951 alloy[J]. Rare Metals, 2008, 27(2): 216~222

[3] 陈劲松. 激光烧结WC颗粒增强镍基合金块体成形实验研究[J]. 中国激光, 2010, 37(3): 868~872

    Chen Jinsong. Experimental research on formation of laser sintering WC particles reinforced Ni-base alloy bulk[J]. Chinese J. Lasers, 2010, 37(3): 868~872

[4] 王华明, 张凌云, 李安 等. 高性能航空金属结构材料及特种涂层激光熔化沉积制备与成形研究进展[J]. 金属热处理, 2008, 33(1): 82~85

    Wang Huaming, Zhang Lingyun, Li An et al.. Progress on laser melting deposition processing and manufacturing of advanced aeronautical metallic structural materials and coatings[J]. Heat Treatment of Metals, 2008, 33(1): 82~85

[5] 冯莉萍, 黄卫东, 林鑫 等. FGH95合金激光成形定向凝固显微组织与性能[J]. 中国有色金属学报, 2003, 13(1): 181~187

    Feng Liping, Huang Weidong, Lin Xin et al.. FGH95 superalloy laser metal forming directional solidification[J]. The Chinese Journal of Nonferrous Metals, 2003, 13(1): 181~187

[6] Liu Dong, Zhang Shuquan, Li An et al.. Microstructure and tensile properties of laser melting deposited TiC/TA15 titanium matrix composites[J]. J. Alloys & Compounds, 2009, 485(1-2): 156~162

[7] Chen Jianyin, Xue Lijue. Process-induced microstructural characteristics of laser consolidated IN-738 superalloy[J]. Mater. Sci. Engng. A, 2010, 527(27-28): 7318~7328

[8] 张永忠, 黄灿, 吴复尧 等. 激光熔化沉积γ-TiAl合金的组织及力学性能[J]. 中国激光, 2010, 37(10): 2684~2688

    Zhang Yongzhong, Huang Can, Wu Fuyao et al.. Microstructure and mechanical properties of laser direct deposited γ-TiAl alloy[J]. Chinese J. Lasers, 2010, 37(10): 2684~2688

[9] 陈静, 张凤英, 谭华 等. 激光多层熔覆沉积预混合Ti-xAl-yV合金粉末在熔池中的熔化与偏析行为[J]. 中国激光, 2010, 37(8): 2154~2159

    Chen Jing, Zhang Fengying, Tan Hua et al.. Alloying mechanics in moving melt pool during laser solid forming from blended elemental powders[J]. Chinese J. Lasers, 2010, 37(8): 2154~2159

[10] 谭永宁, 黄朝晖, 贾新云 等. 一种新型定向凝固柱晶高温合金DZ408的研究[C]. 北京: 第十一届中国高温合金年会论文集, 2007. 389~391

    Tan Yongning, Huang Zhaohui, Jia Xinyun et al.. Study on a directionally solidified superalloy DZ408 (DZ8)[C]. Beijing: Eleventh Annual Meeting of Chinese High-Temperature Alloys Proceedings, 2007. 389~391

[11] 黄卫东, 林鑫, 陈静 等. 激光立体成形[M]. 西安: 西北工业大学出版社, 2007. 117~134

    Huang Weidong, Lin Xin, Chen Jing et al.. Laser Solid Forming[M]. Xi′an: Northwestern Polytechnical University Press, 2007. 117~134

[12] 胡汉起. 金属凝固原理(第2版)[M]. 北京: 机械工业出版社, 2000. 241

    Hu Hanqi. Fundamental of Metallic Solidification(2nd Edition)[M]. Beijing: China Machine Press, 2000. 241

[13] 何金江, 钟敏霖, 刘文今 等. 保护箱中激光沉积的粉末流、熔池观测与分析[J]. 中国激光, 2006, 33(2): 284~288

    He Jinjiang, Zhong Minlin, Liu Wenjin et al.. Observation and analysis on behaviors of powder stream concentration and molten pool in laser deposition process in controlled environment chamber[J]. Chinese J. Lasers, 2006, 33(2): 284~288

[14] 杨海欧, 林鑫, 陈静 等. 利用激光快速成形技术制造高温合金不锈钢梯度材料[J]. 中国激光, 2005, 32(4): 567~570

    Yang Haiou, Lin Xin, Chen Jing et al.. Functionally gradient materials prepared with laser rapid forming[J]. Chinese J. Laser, 2005, 32(4): 567~570

[15] N. Wang, S. Mokadem, M. Rappaza et al.. Solidification cracking of superalloy single-and bi-crystals[J]. Acta Materialia, 2004, 52(11): 3173~3182

[16] 余永宁. 金属学原理[M]. 北京: 冶金工业出版社, 2000. 268

    Yu Yongning. The Principle of the Metallorgy[M]. Beijing: Metallurgical Industry Press, 2000. 268

[17] M. Gumann, C. Bezenon, P. Canalis et al.. Single-crystal laser deposition of superalloys: processing-microstructure maps[J]. Acta Materialia, 2001, 49(6): 1051~1062

[18] Li Jia, Wang Huaming. Microstructure and mechanical properties of rapid directionally solidified Ni-base superalloy Rene 41 by laser melting deposition manufacturing[J]. Mater. Sci. Engng., 2010, 527(18-19): 4823~4829

姜华, 汤海波, 方艳丽, 王华明. 激光熔化沉积DZ408镍基高温合金微细柱晶显微组织及性能[J]. 中国激光, 2012, 39(2): 0203004. Jiang Hua, Tang Haibo, Fang Yanli, Wang Huaming. Microstructure and Mechanical Properties of Rapid Solidified Ultra-Fine Columnar Grain Ni-Base Superalloy DZ408 by Laser Melting Deposition Manufacturing[J]. Chinese Journal of Lasers, 2012, 39(2): 0203004.

本文已被 7 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!