针对定向凝固镍基高温合金叶片的强化与修复需求,研究了在定向凝固镍基高温合金基体上激光熔覆Inconel 738的裂纹敏感性问题.在定向凝固镍基高温合金基体上激光熔覆Inconel 738合金对裂纹非常敏感,所产生的裂纹为热裂纹,由定向凝固基体晶界处引发并穿过界面向熔覆层发展;多层熔覆过程中熔覆层间也会产生热裂纹,热裂纹沿晶界纵向扩展.定向凝固高温合金基体晶界处的低熔共晶成为主要的裂纹源.严格控制激光熔覆过程中的热输入量可以显著降低裂纹敏感性.选择适当的熔覆工艺方法和参数可以在定向凝固镍基合金基体上形成良好冶金结合且无裂纹的基本保持定向凝固特性的熔覆层组织.
参考文献
| [1] | 陈荣章,佘力,张宏炜,王罗宝.DZ125定向凝固高温合金的研究[J].航空材料学报,2000(04):14-19. |
| [2] | 熊建钢,胡乾午,吴丰顺,李志远,段爱琴.镍基高温合金激光焊接接头组织及裂纹形成原因[J].应用激光,2001(05):309-312. |
| [3] | 李晓莉,刘文今,钟敏霖.高温合金K403的激光熔覆研究[J].应用激光,2002(03):283-286. |
| [4] | O. A. Ojo;N. L. Richards;M. C. Chaturvedi .Contribution of constitutional liquation of gamma prime precipitate to weld HAZ cracking of cast Inconel 738 superalloy[J].Scripta materialia,2004(5):641-646. |
| [5] | HAAFKENS M H;MATTHEY J H G .A new approach to the weldability of Nickel-base as-cast and powder metallurgy superalloys[J].Welding Journal,1982,11:25-30. |
| [6] | Gaumann, M., -;Cleton, F;Wagniere, JD;Kurz, W., -;Henry, S .Epitaxial laser metal forming: analysis of microstructure formation[J].Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing,1999(1-2):232-241. |
| [7] | Y. P. Kathuria .Some aspects of laser surface cladding in the turbine industry[J].Surface & Coatings Technology,2000(2/3):262-269. |
| [8] | GANDY D W;FREDERICK G J;PETERSON A J.Development of a laser-based/high strength weld filler process to extend repair limits on IN-738 gas turbine blades[A].,2000:7-9. |
| [9] | L. Sexton;S. Lavin;G. Byrne .Laser cladding of aerospace materials[J].Journal of Materials Processing Technology,2002(1):63-68. |
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