PSI - Issue 83

Sze Pei Tan et al. / Procedia Structural Integrity 83 (2026) 28–40

35

As-built

268.0 239.0

77.0 73.0

333.0 292.0

1.4 3.9

Aboulkhair et al. (2016) [26]

T6

Wycisk (2014) [27]

As-built

230.0 245.0

-

328.0 278.0

4.1 3.6

T6

73.0

Lehner et al., (2024) [28]

As-built

277

-

425

3

T6

233

-

282

5.4

Fig. 6 shows the tensile test results comparing the mechanical properties of heat-treated and non-treated specimens. Under quasi-static loading, the as-built specimens exhibit brittle behavior, achieving a strain of just over 4%. Their ultimate tensile strength (UTS) and yield strength are measured at 162.5 MPa and 280.4 MPa, respectively. In contrast, the heat-treated (T6) specimens demonstrate enhanced mechanical performance: their yield strength rises to 242.0 MPa, while the UTS increases to 310.2 MPa, marking a 9.6 % improvement over the as-built condition. Notably, ductility improves significantly in the T6 specimens, with strain reaching 14.7 % which increased 3.1 % compared to the as-built state. These enhancements are attributed to microstructural refinement during the solution heat treatment (SHT) in the T6 process, which promotes spheroidization of Si particles and reduces defects.

400

As-Built Heat-Treated (T6)

300

200

100 Stress, (MPa)

0

2

4

6

8

10 12 14 16

Strain, (%)

Fig. 6. Comparison of tensile results between as-built and T6 for AlSi10Mg.

4.2. Fatigue life testing This study evaluates the fatigue life behavior of DMLS-produced AlSi10Mg specimens in both as-built and heat treated conditions, with results from fatigue testing presented in Table 4 and Table 5. These table data summarize the fatigue life data and testing parameters for both conditions. Stresses were scaled from 90% to 50% of the ultimate tensile strength (UTS), with five specimens tested per stress level. Loading parameters differed between heat-treated and non-treated specimens to reflect their distinct UTS values. However, Fig. 7 shows the Comparison of fatigue behavior between experimental and previous study [29] for as-built and heat-treated specimens. At higher