PSI - Issue 18

A. Brotzu et al. / Procedia Structural Integrity 18 (2019) 742–748

745

4

Author name / Structural Integrity Procedia 00 (2019) 000–000

By observing fracture surfaces of specimens subjected to tensile tests (Fig. 5) it is apparent that this material is characterized by a very ductile behavior, in fact the alloy shows an evident necking (Fig. 5a) and a fracture surface characterized by dimples (Fig. 5b). Brittle fracture areas are not visible on these specimens.

Fig. 2. SEM micrographs showing the Cr rich phase.

100 120 140

0 20 40 60 80

450 C 500 C

Hardness (HV 0)

0

0.5

1

1.5

2

2.5

3

Time (h)

Fig. 3. Alloy hardness as a function of aging time for aging treatments carried out at 450 and 500 °C.