PSI - Issue 77

V. Kroužecký et al. / Procedia Structural Integrity 77 (2026) 161 – 169 Vít Kroužecký / Structural Integrity Procedia 00 (2026) 000 – 000

167 7

Figure 5 Surface topology, modify parameters (top image) default parameters (bottom image)

Table 5 Surface roughness of testing sample

Surface parameter

Default parameter

Improve parameters Description

Sa Sq Sp Sv Sz

65.7 [µm] 83.3 [µm] 441.9 [µm] 414.4 [µm] 856.3 [µm]

62.5 [µm] 78.7 [µm] 247.3 [µm] 491.5 [µm] 738.9 [µm]

Average height of selected area Root-Mean-Square height of selected area Maximum peak height of selected area Maximum valley depth of selected area Maximum height of selected area

The results of the tensile tests of samples produced with standard process parameters (A) and with the modified parameter set (B) are summarized in Table 6 Tensile result (A - default parameters; B- modify parameters) and illustrated in Figure 6 Tensile graph (Default parameters – Blue line; modify parameters – red line). From the stress – strain curves, it can be observed that both sets of samples achieve similar values of yield strength (Rp0.2) and ultimate tensile strength (Rm). The key differences, however, lie in ductility and elastic modulus. Samples manufactured with the modified parameters exhibit higher elongation values and, in particular, consistently increased elastic modulus. These findings indicate that the modified parameters positively influence both the plasticity and elasticity of the material, which may be beneficial for applications in the energy industry.

Table 6 Tensile result (A - default parameters; B- modify parameters)

Sample

Rp0,2 [MPa]

Rm [MPa]

A [%]

Z [%]

Modul [GPa]

A1 A2 A3 A4 A5 B1 B2 B3 B4 B5

403 406 394 396 386 414 407 405 401 407

543 545 540 538 554 547 558 547 545 546

33,4 38,6 31,7 35,4 32,2 41,7 40,1 38,8 38,9 44,9

45,6

134,9 145,8 127,2 148,1 157,7 169,2 184,8 189,2 186,8 223

42

51,4 41,6 44,7 51,5 45,9 50,5 53,6 42