Fatigue Strength Of Heat And Surface Treated Maraging Steel Manufactured By L-PBF

Authors:

Tugce Tekin (1,2), Francesco Naclerio (3), Rasim Ipek (2), Alberto Molinari (1), Matteo Benedetti (1)

1- University of Trento, Trento, Italy

2- Ege University, Izmir, Turkey

3- Pontillo Officine Meccaniche & C., Scafati (SA), Italy

Abstract:

The axial fatigue strength of maraging steel produced by Laser Powder Bed Fusion (L-PBF) was investigated for different heat and surface treatments The following treatments were considered: Direct Aging of the as-built material and a duplex surface treatment consisting in a plasma nitriding followed by a PVD coating. The surface treatment increases the fatigue strength by 40% at 107 cycles, but the improvement decreases with increasing stress amplitude. The improvement is due to the hard diffusion layer, which causes a transition from a surface-initiating failure to an interior-initiating failure at low stress amplitude.

DOI:

https://doi.org/10.59499/EP246281494