Tribological properties of biomedical 316L stainless steel after plasma nitriding and Ti-C:H sputtering coating

2018 ◽  
Vol 70 (8) ◽  
pp. 1516-1526
Author(s):  
Wen-Hsien Kao ◽  
Yean-Liang Su
Keyword(s):  
Stainless Steel ◽  
Tribological Properties ◽  
316L Stainless Steel ◽  
Plasma Nitriding ◽  
Effective Means ◽  
Tribological Performance ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Content Type ◽  
Wear Tests

Purpose This paper aims to investigate the effects of plasma nitriding and Ti-C:H coating deposition on AISI 316L and to find the best tribological performance of various specimens. Design/methodology/approach An experimental investigation is performed into the effects of plasma nitriding and Ti-C:H sputtering on the tribological properties of AISI 316L biomedical stainless steel. Five samples are prepared, namely, original AISI 316L stainless steel (code: 316L), nitrided 316L (code: N316), 316L and N316 sputtered with Ti-C:H (codes: D316 and DN316, respectively) and polished N316 sputtered with Ti-C:H (DN316s). The microstructure, mechanical properties and coating adhesion strength of the various samples are investigated and compared. The tribological properties of the samples are then evaluated by means of reciprocating wear tests performed in 8.9 Wt.% NaCl solution against three different counterbodies, namely, a 316L ball, Ti6Al4V ball and Si3N4 ball. Findings It is shown that plasma nitriding followed by Ti-C:H deposition (DN316s) improves the tribological properties of AISI 316L; the sample provides the best tribological performance of the various specimens and has a wear rate approximately 156 times lower than that of the original 316L substrate. Originality/value The results suggest that nitriding followed by polishing and Ti-C:H sputtering provides an effective means of improving the service life of AISI 316L biomedical implants.

Evaluation of the tribological performance of the green hBN nanofluid on the friction characteristics of AISI 316L stainless steel

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sıtkı Akincioğlu ◽  
Şenol Şirin
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
316L Stainless Steel ◽  
Tribological Performance ◽  
Performance Criteria ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Content Type ◽  
Test Conditions ◽  
Ball On Disc

Purpose The purpose of this study is to investigate the effect of new green hexagonal boron nitride (hBN) nanofluid on AISI 316L stainless friction coefficient, wear resistance and wear using a ball on disc tester. Design/methodology/approach Nanofluids were prepared by adding hBN nanoparticles with two-step method to the vegetable-based oil at 0.50 vol%. Before the experiments, hBN nanofluid viscosity, pH and thermal conductivity specifications were determined. Friction tests of AISI 316L stainless steel were performed under 2 N, 5 N and 8 N loads at 400 rpm using a ball-on-disc test device under dry, oil and hBN conditions. Coefficient of friction, wear profile, surface integrity and wear mechanisms were chosen as performance criteria. Findings The friction coefficient values obtained under the oil and hBN test conditions with the 8 N load were, respectively, 72.46% and 77.64% lower than those obtained under dry test conditions. hBN nanofluid performed better on surface topography, and especially wear, compared to the dry and oil test conditions. Practical implications The aim of this study was to determine the best tribological performance of the hBN nanofluid on AISI 316L stainless steel used in orthopedic applications. Originality/value The paper is a study investigating the effect of hBN nanoparticle additive in vegetable-based oil on friction and wear performance of AISI 316L stainless steel. It is an original paper and is not published elsewhere.

E-pH diagrams for 316L stainless steel in chloride solutions containing SO42− ions

2016 ◽  
Vol 63 (6) ◽  
pp. 431-436 ◽  
Author(s):  
Somrerk Chandra-ambhorn ◽  
Wisarut Wachirasiri ◽  
Gobboon Lothongkum
Keyword(s):  
Stainless Steel ◽  
Pitting Corrosion ◽  
316L Stainless Steel ◽  
Corrosion Potential ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Chloride Solutions ◽  
Content Type ◽  
Catalytic Role

Purpose This paper aims to construct the E-pH diagrams for AISI 316L stainless steel in chloride solutions containing SO42− ions and therefore investigate the role of SO42− ions on pitting corrosion of stainless steel. Design/methodology/approach A cyclic potentiodynamic polarisation method was performed to obtain polarisation curves at different pH. From these curves, corrosion, primary passivation, pitting and repassivation potentials were determined and plotted as a function of pH giving the E-pH diagram. Findings The addition of SO42− ions to 10,650 ppm NaCl solution up to 3,000 ppm widened the passivation regime of the E-pH diagram mainly by shifting the pitting corrosion potential to the noble direction. This indicated the inhibiting role of SO42− on the nucleation of new pits in the transpassive region. It also stabilised the pitting corrosion potential at the pH ranging from 5 to 11. However, at pH 7, it caused the pit area to increase, implying the catalytic role of SO42− on the pit growth. Finally, it did not change the types of ions dissolved in solutions after pitting. Practical implications The diagrams can be used as a guideline in industries to determine the passivation regime of the AISI 316L stainless steel in chloride- and sulphate-containing solutions. Originality/value This paper reported the E-pH diagrams for the AISI 316L stainless steel in chloride solutions containing SO42− ions. The roles of pH and SO42− ions on pitting corrosion were innovatively discussed using a point defect model.

Corrosion fatigue behavior of Al-5Mg coated AISI 316L stainless steel in sodium chloride environments under bending load

2019 ◽  
Vol 66 (1) ◽  
pp. 34-39 ◽  
Author(s):  
Mustafa Öcal ◽  
Recep Sadeler
Keyword(s):  
Stainless Steel ◽  
Sodium Chloride ◽  
316L Stainless Steel ◽  
Fatigue Behavior ◽  
Base Material ◽  
Ambient Air ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Content Type ◽  
Bending Load

Purpose The purpose of this study is to describe the environmentally assisted cracking (EAC) of AISI 316L stainless steel as bare and coated cases in several corrosion environments. The main purpose of this study is to extend the lifespan of 316L material under corrosive fatigue in sodium chloride environments. Design/methodology/approach Fatigue tests carried out by using a Schenk type plane bending fatigue machine made by Tokyokoki Co. A scanning electron microscope (SEM) was used to observe the fracture surfaces and tested specimen surfaces. The micro-Vickers hardness of specimens was measured by using a PC-controlled Buehler–Omnimet tester. Findings Under reciprocating bending condition (R = −1) the behavior of 316L SS bare samples and 316L SS coated with Al-5%Mg samples were investigated comparatively at room temperature in ambient air and in several corrosion solutions. The results obtained from the data showed that Al-5Mg coating procedure significantly stabilized the 316L SS even in the most aggressive environment 5 per cent NaCl solution as compared with bare samples. Originality/value Al-5Mg coating showed a stable structure under the corrosion liquids used in the experiments. The coating material served as a stable barrier between the base material and the corrosion fluid, thus ensuring a tightness even in long-term tests below the endurance limit.

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