Inconel 718高温合金被广泛地应用于航空航天和汽轮机领域。在激光熔覆Inconel 718合金中存在铌的偏聚现象，而铌偏聚会影响到合金在快速凝固过程中的相变。为了控制熔覆层的显微组织并提高其力学性能，采用组织观察和能谱分析研究凝固条件对铌偏聚及富铌Laves相形成的影响规律。结果表明冷却速度对熔覆组织具有显著影响。高的冷却速度有利于抑制铌的偏聚，减少对Inconel 718合金力学性能有害的Laves相的析出。
Inconel 718 superalloy is widely used in the aerospace and turbine industry. Segregation of niobium appears in the laser cladding Inconel 718 superalloy and consequently influences the phase transformation during the rapid solidification. In order to control the microstructure and improve the mechanical properties of the deposited coating, the the influence of solidification conditions on the segregation of niobium and the resultant formation of Nb-rich Laves phase was studied using the microstructure observation and EDS analysis. The results show that the cooling rate has considerable influence on the microstructure of the deposited coating. High cooling rate is beneficial for suppressing the segregation of Nb and reducing the formation of Laves phase, which is believed to be detrimental to the performance of the Inconel 718 alloy.
参考文献
| [1] | Miller MK.;Babu SS.;Burke MG..Comparison of the phase compositions in Alloy 718 measured by atom probe tomography and predicted by thermodynamic calculations[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20021 SpecialIssueSI(1 SpecialIssueSI):84-88. |
| [2] | Weifu Wang;Maocai Wang;Zhang Jie;Fengjiu Sun;Dawei Huang.Research On The Microstructure And Wear Resistance Of Titanium Alloy Structural Members Repaired By Laser Cladding[J].Optics and Lasers in Engineering,200811(11):810-816. |
| [3] | Lin, X.;Cao, Y.;Wu, X.;Yang, H.;Chen, J.;Huang, W..Microstructure and mechanical properties of laser forming repaired 17-4PH stainless steel[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2012:80-88. |
| [4] | Liu, F.;Lin, X.;Leng, H.;Cao, J.;Liu, Q.;Huang, C.;Huang, W..Microstructural changes in a laser solid forming Inconel 718 superalloy thin wall in the deposition direction[J].Optics & Laser Technology,2013:330-335. |
| [5] | Jon Lambarri;Josu Leunda;Virginia Garcia Navas;Carlos Soriano;Carmen Sanz.Microstructural and tensile characterization of Inconel 718 laser coatings for aeronautic components[J].Optics and Lasers in Engineering,20137(7):813-821. |
| [6] | Radhakrishna C.;Rao KP..THE FORMATION AND CONTROL OF LAVES PHASE IN SUPERALLOY 718 WELDS[J].Journal of Materials Science,19978(8):1977-1984. |
| [7] | K. SIVAPRASAD;S. GANESH SUNDARA RAMAN.Influence of Weld Cooling Rate on Microstructure and Mechanical Properties of Alloy 718 Weldments[J].Metallurgical and materials transactions. A, physical metallurgy and materials science,20089(9):2115-2127. |
| [8] | T. Antonsson;H. Fredriksson.The Effect of Cooling Rate on the Solidification of INCONEL 718[J].Metallurgical and Materials Transactions, B. Process metallurgy and materials processing science,20051(1):85-96. |
| [9] | Zhiguo Gao;O.A. Ojo.Modeling analysis of hybrid laser-arc welding of single-crystal nickel-base superalloys[J].Acta materialia,20126/7(6/7):3153-3167. |
| [10] | M. GAUMANN;C. BEZENCON;P. CANALIS.SINGLE-CRYSTAL LASER DEPOSITION OF SUPERALLOYS: PROCESSING-MICROSTRUCTURE MAPS[J].Acta materialia,20016(6):1051-1062. |
| [11] | J.N.Dupont;C.V.Robino;A.R.Marder.Modeling solute redistribution and microstructural development in fusion welds of Nb-Bearing superalloys[J].Acta materialia,199813(13):4781-4790. |
| [12] | H. QI;M. AZER;A. RITTER.Studies of Standard Heat Treatment Effects on Microstructure and Mechanical Properties of Laser Net Shape Manufactured INCONEL 718[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,200910(10):2410-2422. |
| [13] | Huang X.;Richards N.L..Effect of Homogenization Heat Treatment on the Microstructure and Heat-Affected Zone Microfissuring in Welded Cast Alloy 718[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,19963(3):785-790. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%