PSI - Issue 77

Jakob Blankenhagen et al. / Procedia Structural Integrity 77 (2026) 198–206 Author name / Structural Integrity Procedia 00 (2026) 000–000

204

7

650 700 750

15 10 20 25 30 35 40 45 50 55 60 65 70 75

Engineering Stress: MT2 Distribution of Strains in the Specimen: Base Material Printdur® HSA HAZ Printdur® HSA Weld G 18 8 Mn HAZS460 Base Material S460

150 100 200 250 300 350 400 450 500 550 600

Distribution of Strains in

50

5 0

0

0

2

4

6

8

10 12 14 16

Fig. 6. Nominal stress strain curve of MT2 MIG welded specimen with distribution of strains in the specimen

material accompanied by enhanced ductility at higher treatment temperatures. In contrast, the variation of the applied t 8 / 5 cooling times (5 to 20 s) showed no systematic e ff ect on the tensile properties.

® HSA specimens for di

Fig. 7. (a) mechanical strength of the heat-treated PBF-LB / M / Printdur

ff erent heat-treatment conditions, (b) elongation at

® HSA specimens for di

ff erent heat-treatment conditions

fracture of the heat-treated PBF-LB / M / Printdur

4. Discussion

The tensile and macroscopic fracture analyses revealed distinct di ff erences between the two welding methods. Laser-welded specimens showed lower reproducibility, with two out of three samples failing prematurely within the weld. Macroscopic fractography confirmed the presence of pores in the weld, which acted as crack initiation sites and promoted brittle or mixed-mode fracture. Only one specimen reached the strength and ductility levels of the S460NL base material.