PSI - Issue 77

5

Karel Trojan et al. / Procedia Structural Integrity 77 (2026) 537–542 Trojan / Structural Integrity Procedia 00 (2026) 000–000

541

4.2

4.0

3.8

FWHM, °2  3.2 3.4 3.6

SP SP120

3.0

2.8

z,  m 0 20 40 60 80 100 120 140

Fig. 3. Depth profile of the FWHM parameter for samples with different building platform preheating.

Fig. 4 graphically presents the obtained high cycle fatigue testing data in the form of S-N curves. The different behaviour of samples printed under standard conditions and those printed with a higher build platform temperature is clearly visible. At all selected load levels, the SP120 samples exhibit a higher number of cycles to failure. Similarly, samples that did not fail after reaching 2 million cycles were loaded with higher stress. Table 3 summarizes the results of fitting the experimental data using equation (1), where there is a significant difference in all monitored parameters. Especially, samples printed with an increased build platform temperature show an endurance limit that is 110 MPa higher.

Fig. 4. S-N curve for samples with different building platform preheating.

′ , MPa , - 9544

, MPa 123

Table 3. Results of high cycle fatigue testing.

Samples

SP

-0.300 -0,145

SP120

1908

233

Therefore, when evaluating all results obtained via X-ray diffraction, namely macroscopic residual stresses and high-cycle fatigue performance, it is unsurprising that sample SP120 demonstrates higher fatigue life. This can be attributed to several key factors.