研究目的
Investigating the effects of shot peening (SP) and laser peening (LP) on Additively Manufactured (AM) Inconel 718 (In718) to enhance fatigue performance, especially for high-temperature applications such as jet engine turbine blades.
研究成果
The LP + TME technique shows great promise for extending the performance of superalloys in high-temperature applications, including both wrought and AM materials. The process could enable the use of AM components in safety-critical applications, combining safety and improved fuel efficiency.
研究不足
The study was limited by the availability of samples and the desire to test a range of process parameters, typically only 2 samples per parameter were tested. Variation of test results were typically in the range of 20% or less.
1：Experimental Design and Method Selection:
The study involved laser peening and shot peening treatments on AM In718 samples, followed by thermal exposures to evaluate fatigue life improvement.
2：Sample Selection and Data Sources:
AM Inconel 718 fatigue test samples were fabricated by direct metal laser sintering (DMLS).
3：List of Experimental Equipment and Materials:
A 20 kip Instron test rig for 4-point bending tests, laser peening equipment, and shot peening equipment were used.
4：Experimental Procedures and Operational Workflow:
Samples were subjected to various peening processes, thermal exposures, and then fatigue tested.
5：Data Analysis Methods:
Residual stress measurements were made using slitting crack-compliance technique and x-ray diffraction (XRD). Fatigue lifetimes were measured and compared.
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