激光熔覆修复定向凝固镍基高温合金及其拉伸性能

朱晓峰; 钟敏霖; 刘文今; 张红军

中国激光, 2007, 34 (s1): 185, 网络出版: 2009-05-25

激光熔覆修复定向凝固镍基高温合金及其拉伸性能

Laser Cladding Repairing of Directionally Solidified Ni-Base Superalloy and Its Tensile Property

论文大纲

朱晓峰 ^*钟敏霖刘文今张红军

作者单位

清华大学机械系激光加工研究中心，教育部先进成型重点实验室，北京 100084

摘要

高Al、Ti含量的定向凝固镍基高温合金在传统的修复过程中由于较大的热输入，存在严重的热裂倾向。利用激光热量集中、能量输入小的特点，可以有效控制修复过程中的热输入，从而减小铸造基体的晶界液化和开裂倾向。在优选参数下，可以获得无裂纹的修复组织，并可实现定向凝固组织的连续生长。对修复组织进行热处理，结果表明热处理过程不会促使裂纹产生，也不会影响熔覆层组织的定向凝固特征，但对于其内部γ′相的析出行为及形貌有较大影响，从而影响了沉积层的力学性能。对沉积层的拉伸性能测试表明，无论在常温还是高温(900 ℃)下，沉积层的拉伸性能都达到了铸造基体拉伸性能的80%以上，而且均为塑性断裂，一定程度上满足了实际修复需求。

Abstract

Directionally solidified Ni-base superalloys with high volume content of Al, Ti are considered unrepairable by traditional welding methods due to its high crack susceptivity to heat input. By strictly controlling the laser parameters, however, sound deposition layers were achieved free of cracks. It was also characterized by directional solidification which was not affected by heat treatment process. Large amounts of secondary γ′ particles were precipitated during heat treatment which greatly influenced the mechanical performance of the deposited layers. The tensile tests both of room temperature and 900 ℃ indicated that the tensile strength of the deposition layers after heat treatment can reach 80% of the base material and the fracture were ductile. The mechanical performance of the deposition layers can meet practical need of industrial use.

参考文献

[1] . H. Haafkens, J. H. G. Matthey. A new approach to the weldability of nickel-base as-cast and powder metallurgy superalloys[J]. Welding Journal, 1982, 61(11): 25-30.

[2] Gandy D. W., Frederick G. J., Peterson A. J. et al.. Development of a laser based/high strength weld filler process to extend repair limits on IN 738 gas turbine blades [C]. Fourth International EPRI Conference, 2000. 7～9

[3] . Fuesting, Gregory Danyo. Direct laser fabrication of superalloy cermet abrasive turbine blade tips[J]. Materials and Design, 2000, 21(2): 63-73.

[4] Xue L., Chen J. Y., Islam M. U. et al.. Laser consolidation of IN-738 alloy for repairing cast IN-738 gas turbine blades [C]. In: ASM Proceedings: Heat Treating, 2000, 2: 1063～1071

[5] . Kurz, C. Bezencon, M. Gaumann. Columnar to equiaxed transition in solidification processing[J]. Science and Technology of Advanced Materials, 2001, 2(1): 185-191.

[6] . Gaumann, C. Bezencon, P. Canalis et al.. Single-crystal laser deposition of superalloys: processing-microstructure maps[J]. Acta Materials, 2001, 49: 1051-1062.

[7] . 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): 181-186.

. . FGH95 superalloy laser metal forming directional solidification[J]. The Chinese Journal of Nonferrous Metals, 2003, 13(1): 181-186.

[8] Yoshihiro Fujita, Kazuyoshi Saida, Kazutoshi Nishimoto. Crystalline controlled cladding of Ni-base single crystal superalloy by diode laser [C]. Laser Materials Processing Conference, 2005. 761～768

[9] . 定向凝固镍基高温合金上激光熔覆Inconel 738的裂纹敏感性研究[J]. 航空材料学报, 2005, 25(2): 26-31.

. . Cracking sensitivity on laser cladding inconel 738 on directionally solidified Ni-base superalloy[J]. Journal of Aeronautical Materials, 2005, 25(2): 26-31.

[10] . . Boundary liquation and interface cracking characterization in laser deposition of Inconel 738 on directionally solidified Ni-base superalloy[J]. Scripta Materialia, 2005, 53(2): 159-164.

[11] 张松, 陈江, 王茂才等. 多次辐照条件下YAG脉冲激光熔覆层开裂敏感性研究 [J]. 中国激光, 1999, A26(4): 362～366

Zhang Song, Chen Jiang, Wang Maocai et al.. Study of cracking sensitivity of clad layers induced by multi-irradiation of a YAG-pulsed laser [J]. Chinese J. Lasers, 1999, A26(4): 362～366

朱晓峰, 钟敏霖, 刘文今, 张红军. 激光熔覆修复定向凝固镍基高温合金及其拉伸性能[J]. 中国激光, 2007, 34(s1): 185. 朱晓峰, 钟敏霖, 刘文今, 张红军. Laser Cladding Repairing of Directionally Solidified Ni-Base Superalloy and Its Tensile Property[J]. Chinese Journal of Lasers, 2007, 34(s1): 185.

激光熔覆修复定向凝固镍基高温合金及其拉伸性能

关于本站 Cookie 的使用提示

全站搜索

激光熔覆修复定向凝固镍基高温合金及其拉伸性能

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索