Characterization of weld seam surface and corrosion behavior of laser-beam-welded AISI 2205 duplex stainless steel in si
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Characterization of weld seam surface and corrosion behavior of laser-beam-welded AISI 2205 duplex stainless steel in simulated body fluid Ceyhun Ko¨se1,* 1
Faculty of Engineering and Architecture, Department of Mechanical Engineering, Tokat Gaziosmanpas¸ a University, Tokat 60150, Turkey
Received: 9 May 2020
ABSTRACT
Accepted: 5 September 2020
In this study, AISI 2205 duplex stainless steel was joined with laser welding. Base material and laser-welded samples were kept in simulated body fluid (SBF) for 1, 3, 7, 14, 21, and 28 days. This research investigated microstructure, hydroxyapatite (HA) structure formed on surfaces, surface topography, and corrosion properties of samples which were kept in SBF. Characterization studies were performed by using microhardness, optical microscope, macroscope, SEM–EDS, XRD, and atomic force microscope. According to results, it was found out that HA accumulation was higher on base material surface when compared to weld seam surface, and also calcium-deficient carbonate HA structure with low crystallinity was observed on all surfaces. Very low corrosion rates due to very low weight losses were detected in all samples kept in SBF. The results showed us that heat input changes had an important effect on surface roughness values (Ra), apatite morphology on weld seam surfaces, and corrosion behaviors. Overall, it is considered that laser-welded duplex stainless steel can be used as an implant material depending on surface characterization and corrosion behaviors.
Published online: 22 September 2020
Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction In the biomedical industry, metallic materials are widely used as stents, orthodontic wires, and shortor long-term orthopedic implants. Stainless steels, cobalt-based alloys, and titanium alloys are mostly preferred as metallic implant group [1]. Stainless
steels have been used as permanent medical implant for long years [1]. Stainless steel type used generally as implant is 316L austenitic stainless steel [4]. Thin chromium-oxide film formed on surface of AISI 316L stainless steel causes an increase in corrosion resistance and biocompatibility [1]. 316L stainless steels are used as stents, orthodontic wires, and orthopedic
Handling Editor: David Balloy.
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https://doi.org/10.1007/s10853-020-05326-7
17233
J Mater Sci (2020) 55:17232–17254
implants because of their high mechanical strength and biocompatibility properties [2–4]. In case of usage of 316L austenitic stainless steel in human body as long-term implant, it can show nickel and chromium ions release. Also experience degradation and corrosion, especially stress and pitting corrosion can be observed in such usage [5]. When stainless steel implants are used as long-term implants, ions release such as Fe, Cr, and Ni even in small amounts on their surfaces can be seen. This situation can cause problems for people with allergy to these metal ions [6, 7]. Chromium and ni
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