PSI - Issue 24

Jacopo De Nisi et al. / Procedia Structural Integrity 24 (2019) 541–558

556 16

Paolo Folgarait et al./ Structural Integrity Procedia 00 (2019) 000 – 000

Fig. 13 . Reduction of Area (ROA%) for A1 group (STANDARD). No min value supplied by EOS. Equivalent to B1 (Table 2).

Table 9 . Mechanical properties of 15-5PH solution treated at 1040°C-7hrs air cooling to RT, followed by ageing. Sample ageing cycle details Hardness [HRC] Groups [HRC] Table 6 Solution annealing 35÷40 (expected) + ~ 0 ( as-built ) 36 (measured)* 39,4 ± 0,60 (measured) < H900MSOL (Ageing at 450°C – 4 hrs – air cooling to RT) 42÷48 (expected) ~ B1 (H900M)

43 (measured)° 43 (measured)° 42 (measured)°

46,1 ± 0,43 (measured)

H900SOL (Ageing at 482°C – 1 hrs – air cooling to RT)

41÷47 (expected) +

A2 (H900SOL)

41 (measured)

44,3 ± 0,23 (measured) ~ B2 (H900MSOL)

> H900MSOL (ageing at 496°C – 4 hrs – air cooling to RT)

38÷46 (expected)°

40 (measured)° 41 (measured)° 40 (measured)°

43,4 ± 0,36 (measured)

H1025SOL (ageing at 550°C – 4 hrs – air cooling to RT)

35÷43 (expected)°

C (H1025SOL)

40 (measured)° 41 (measured)° 40 (measured)° 39 (measured)*

37,5 ± 0,47 (measured)

° Q. Yu et al. (2015); * R. Sri Rama Devi et al. (2013); + present work.

All samples produced in 15-5PH and fatherly heat treated (with or without previous solution annealing), when cooled down at RT in air cooling conditions, exhibit a fully martensitic microstructure and no presence of δ -ferrite.