Fatigue life enhancement of additive manufactured 316l stainless steel by LSP using a DPSS laser system

Figures & data

Figure 1. LSP process [14].

Figure 2. Schematic of (a) cross-section of the sample and photograph of (b) produced sample with a fabricated notch.

Table 1. Process parameters used for the manufacturing of AM samples.

	Power (W)	Speed (mm s^−1)	Spot size (mm)	Offset to original contour (mm)	Trace spacing (mm)	Slice thickness (mm)
Support	280	2800	0.05	0.1	–	0.05
Skin	90	150	0.05	0.1	–	0.025
Core	295	950	0.175	0.135	0.11	0.025

Figure 3. Schematic representation of the experimental set-up.

Figure 4. Photograph of (a) creation of LSP patch and (b) samples prepared for fatigue testing.

Table 2. LSP parameters used for the processing.

E (J)	τ (ns)	Spot size (mm × mm)	Overlap (%)	Number of layers	I0 (GW cm−2)
4	10	3 × 3	50	2	4.4

Figure 5. Schematic of (a) 4-point bending test loading scheme and photograph of (b) 4-point bend test rig RUMUL.

Figure 6. Residual stress distribution for AB, AlT, and VT.

Figure 7. Graphical representation of the fatigue test results.

Figure 8. (a,c,e) The SEM micrographs of unpeened, LSP treated with AIT, and LSP treated with VT, respectively. (b,d,f) EBSD micrographs of the same three samples.

Arnold X, Böhm M, Brajer J, et al. HiLASE center: development of new-generation lasers for laser shock peening. Photonics Asia, SPIE, Beijing; Oct 2018.

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