scholarly journals Fatigue Assessment of Inconel 625 Produced by Directed Energy Deposition from Miniaturized Specimens

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 156
Author(s):  
Felipe Klein Fiorentin ◽  
Duarte Maciel ◽  
Jorge Gil ◽  
Miguel Figueiredo ◽  
Filippo Berto ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Energy Deposition ◽  
High Cycle Fatigue ◽  
Fatigue Performance ◽  
Fatigue Properties ◽  
Inconel 625 ◽  
Cycle Fatigue ◽  
Directed Energy Deposition ◽  
Metallic Additive ◽  
Directed Energy

In recent years, the industrial application of Inconel 625 has grown significantly. This material is a nickel-base alloy, which is well known for its chemical resistance and mechanical properties, especially in high-temperature environments. The fatigue performance of parts produced via Metallic Additive Manufacturing (MAM) heavily rely on their manufacturing parameters. Therefore, it is important to characterize the properties of alloys produced by a given set of parameters. The present work proposes a methodology for characterization of the mechanical properties of MAM parts, including the material production parametrization by Laser Directed Energy Deposition (DED). The methodology consists of the testing of miniaturized specimens, after their production in DED, supported by a numerical model developed and validated by experimental data for stress calculation. An extensive mechanical characterization, with emphasis on high-cycle fatigue, of Inconel 625 produced via DED is herein discussed. The results obtained using miniaturized specimens were in good agreement with standard-sized specimens, therefore validating the applied methodology even in the case of some plastic effects. Regarding the high-cycle fatigue properties, the samples produced via DED presented good fatigue performance, comparable with other competing Metallic Additive Manufactured (MAMed) and conventionally manufactured materials.

scholarly journals Evaluation of laser polishing as post-processing of Inconel 625 produced by Directed Energy Deposition

2021 ◽  
Vol 53 ◽  
pp. 368-374
Author(s):  
Kandice S.B. Ribeiro ◽  
Fábio E. Mariani ◽  
Henrique T. Idogava ◽  
Gustavo C. da Silva ◽  
Zilda C. Silveira ◽  
...  
Keyword(s):  
Energy Deposition ◽  
Inconel 625 ◽  
Post Processing ◽  
Laser Polishing ◽  
Directed Energy Deposition ◽  
Directed Energy

Effect of Heat Treatment on Very High Cycle Fatigue Properties of TC4

2021 ◽  
Vol 881 ◽  
pp. 3-11
Author(s):  
Bo Han Wang ◽  
Li Cheng ◽  
Xun Chun Bao
Keyword(s):  
Heat Treatment ◽  
High Cycle Fatigue ◽  
Treatment Method ◽  
Fatigue Performance ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Α Phase ◽  
Very High Cycle Fatigue ◽  
Significant Difference ◽  
Very High

The bimodal, equiaxed and Widmanstatten microstructures of TC4 titanium alloy were obtained through different heat treatment processes. The content of primary α phase in the bimodal and equiaxed microstructures was measured to be about 40% and 90%, and the average size was about 9.4μm and 7.9 μm. Three types of microstructure fatigue S-N curves are obtained, which are successively descending type, single-platform descending type and infinite life type. The order of very high cycle fatigue performance is Widmanstatten>equiaxed>bimodal, but the anti-fretting fatigue performance of Widmanstatten is the worst. The grain refinement makes the fatigue performance of the equiaxed better than that of the bimodal. The second process is determined as the best heat treatment method. There is no significant difference in the life of the crack propagation stage. The very high cycle fatigue life mainly depends on the crack initiation stage. In the bimodal and the equiaxed, the crack initiates in the primary α phase of the subsurface, and the crack in the Widmanstatten initiates in the coarse α 'grain boundary of the subsurface.

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