The improvement of the surface qualities and surface hardening of precipitation hardened martensitic stainless steel 17-4PH was achieved by the plasma-transferred arc welding (PTAW) process deposited with Co-based alloy. The microstructure of the heat affected zone (HAZ) and base metal were characterized by optical microscope (OM), scanning electron microscope (SEM) and transmission electron mi...

Este trabalho foi elaborado para realizar um estudo melhoria de processo na fabricação uma peça feita através da usinagem a partir do material 17-4PH, no qual das etapas é decapagem que após o tratamento térmico envelhecimento. A utiliza ácido bastante agressivo podendo ocasionar acidentes graves se não for manuseado corretamente. Para desse tratado antes ser enviado usinagem, e substituiu deca...

In this study, a Surface Mechanical Attrition Treatment (SMAT) is applied to 17-4PH single edge notched tension (SENT) sample made by Atomic Diffusion Additive Manufacturing (ADAM). Grating of gold nanoparticles allowing multiscale characterizations deposited on the surface specimen electron beam lithography. In-situ tensile test carried out and images are recorded. The crack propagation follow...

To evaluate the interactions between hydrogen and mechanical behavior of additively manufactured (AM) 17-4PH martensitic stainless steel (MSS), stress-relaxation tests were performed for both non-charged hydrogen-charged samples. Similar conventional MSS counterpart (CM). The results clearly indicated significant differences in relaxation properties CM AM MSSs H900 state, which attributed to hi...

The 17-4PH alloy is a martensitic stainless steel with 3–5 wt% Cu, strengthened by the precipitation hardening. Due to excellent mechanical properties, corrosion resistance and ease of heat treatment, this alloy has unique applications in nuclear power plants and marine constructions. In this paper, the influence of ageing heat treatment, solution annealing followed by ageing at 480, 550 and 62...