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Surface modification of a duplex stainless steel for plastic-metal hybrid parts

Sotomayor M. E., Sanz J., Cervera A., Levenfeld B., Varez A.

Archives of Materials Science and Engineering

2015

Vol. 72, nr 2

86--93

Purpose: Of this paper is the evaluation of three different surface treatments on a duplex stainless steel, in order to improve its adhesive properties on a thermoplastic like polysulfone. Design/methodology/approach: In order to improve the adhesion between stainless steel and polysulfone, shot-peening, acid (aqua regia) etching and atmospheric pressure plasma jet have been used. The topography and surface activation effects have been evaluated by means of SEM and contact angle measurements. Additionally, aging studies have been performed to evaluate the effect of storage time of parts on atmospheric plasma torch surface treatment. Finally, to test the effectiveness of the treatments, it has been carried out successfully shear strength tests by tension of adhesive assemblies previously modified with the treatments. It has been also examined rupture failures that have occurred in these assemblies. Findings: Aqua regia and plasma torch treatments have reached the optimal surface modification condition under wettability criteria. Shear strength tests demonstrated that the improved surface adhesion provided on this substrate and the polysulfone is achieved by shot-peening and acid etching treatments. Research limitations/implications: A deeper analysis varying several conditions like humidity could be suggested in order to evaluate the effectiveness of surface treatment. Originality/value: Up to now there is no any study in the literature about the comparison of different surface treatment on duplex stainless steels and the subsequent evaluation of the adhesion of a polymer like polysulfone.

Właściwości mechaniczne spiekanej ferrytycznej stali nierdzewnej AISI 434L modyfikowanej Mn, Ni i Si

Sekuła M., Nykiel M., Kazior J.

Archiwum Odlewnictwa

2006

R. 6, nr 21/2

249-254

W pracy przedstawiono wyniki badań właściwości mechanicznych spiekanych ferrytycznych proszków stali nierdzewnej AISI 434L modyfikowanych manganem, niklem i krzemem. Stwierdzono, iż własności mechaniczne modyfikowanej spiekanej ferrytycznej stali nierdzewnej AISI 434L zależą w dużej mierze od tego, czy mangan został wprowadzony do mieszanki proszków samodzielnie czy też równocześnie z krzemem czy niklem. Znaczny wzrost właściwości wytrzymałościowych przy równoczesnym zachowaniu właściwości plastycznych uzyskano dla ferrytycznej stali nierdzewnej AISI 434L modyfikowanej elementarnym proszkiem manganu.

Mechanical properties of sintered ferritic stainless steel AISI 434L modified by manganese, nickel and silicon were inwestigated. The mechanical properties were depended mainly on microstructure which was obtained after sintering process not on densification of sintered materials. The manganese additions were particularly effective at increasing tensile strength and ductility despite the manganese additions were not effective in raising the sintered density. In contrast, the manganese and silicon additions only increase the tensile strength and decrease ductility and produced the best material in terms of sintered density and hardness.