PSI - Issue 75

Ninian Sing Kok Ho et al. / Procedia Structural Integrity 75 (2025) 35–42 Author name / Structural Integrity Procedia (2025)

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Figure 3: S-N curves of all tested batches of horizontal samples compared against a vertical batch. Legend description: 210 mm/105 mm: HCF sample length; H/V: Sample orientation during printing Horizontal/Vertical; NHT/HT: No Heat Treatment/Heat Treatment; AB: As-built surface. Data from the literature at R=0.1 are plotted in greyscale.

Table 1: Details of all samples tested

Sample Size

Build Orientation

Heat Treatment

Support Structure Removal Production Grinding

% yield (900 MPa)

Stress range (MPa)

Number of cycles to failure

210 mm

Horizontal

-

40.00 30.00 20.00 15.00 10.00 12.50 50.00 13.75 14.38 30.00 40.00 30.00 20.00 30.00 50.00 40.00 35.00 45.00 37.50 32.50 35.00 37.50 37.50 36.25 73.33 48.89 36.67 30.56 24.44

324 243 162 122 101 405 111 116 243 324 243 162 243 405 324 284 365 304 263 284 304 304 294 594 396 297 248 198 81

29621 60136 370673 929677

10000000 10000000

210 mm

Horizontal

-

Precision Grinding

34543

10000000 10000000

321199

210 mm

Horizontal

-

66324

Milled

173569

10000000 10000000

210 mm

Horizontal

Stress Relief

Milled

56719

189560

2676895 107055 182336 10000000 10000000

166734 331483 291026

105 mm

Vertical

-

-

7654

15040 33783 55950

10000000