PSI - Issue 38

Benaouda Abdellaoui et al. / Procedia Structural Integrity 38 (2022) 116–131 Benaouda Abdellaoui et al / Structural Integrity Procedia 00 (2021) 000 – 000

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2. Experimental procedure – The pivot 2.1. Materials The pivots and specimens were developed in additive manufacturing by laser fusion with 17-4PH steel metal powder, the whole was produced under nitrogen. The production parameters and chemical composition are given in Table 1 and Table 2.

Table 1. Production parameters

Machine type

EOS DMLS M290 Si2424

Laser type

400W

Software version

EOSYTEM V2.8.50.0

Materials

17-4PH 40 µm Standard Argon 5.0

Layer thickness

Nozzle type

Atmosphere Process Chamber

Laser path

Against the flow of Argon

Platform temperature

80°C

Scraper

Ceramic

Table 2. Chemical composition of 17-4PH powder (wt%)

Material

C

Si

Mn

P

S

Cr

Ni

Mo

W

Co

EN 10088 EN10250-4

≤ 0,07

≤ 0,7

≤ 1,50

≤ 0,040

≤ 0,015

15,0 – 17,0

3,0 – 5,0

≤ 0,60

-

-

Powder Material

0.036

0.78

0.33

0.009

0.004

16.2

4.02

0.002

0.009

0.012

Al

Nb

V

Ti

Cu

Sn

EN 10088 EN10250-4

-

5xC ≤ 0,45

-

-

3,0 – 5,0

-

Powder

0.001

0.29

0.018

0.002

3.72

0.004

2.2. Specimen descriptions A CAD design was carried out to determine the correct dimensions of the trays, pivots, specimens and the implantation of the different parts on the trays. It also allowed us to determine the supports and reinforcements needed so that the parts were not deformed by the scraper. Fig. 2 shows us the trays with the arrangement of the parts, supports and reinforcements. All the elements underwent a H 900 heat treatment for age hardening at a temperature of 480 ° C. for 2 hours.