Investigation into Effects of Scanning Speed on in Vitro Biocompatibility of Selective Laser Melted 316L Stainless Steel Parts

This study shows the influence of the temperature in the Direct Forming Laser process (DFL) of 316L stainless steel metal powder. Results shows that an increasing in the sample surface temperature can improve the laser beam absorption in the DFL process. A pre-heating in the substrate and in the powder contributed to decrease the time to reach the melting point and to improve the surface roughness. This effect was investigated with constant lasers parameters (scanning speed and intensity) and a heating in the samples in the temperature range of 20oto 200oC. It was possible to evaluate the DFL process and to optimize the quality of the sample surface roughness. These results will benefit the knowledge of the DFL technology that can be applied in the development of turbine blades.

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Experimental Study on Pore-Defect by Selective Laser Melting of 316L Stainless Steel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.801.239 ◽

2019 ◽

Vol 801 ◽

pp. 239-244

Author(s):

Xin Yu Liu ◽

Lu Pan ◽

Wen Hao Wang ◽

Si Yao Li

Keyword(s):

Stainless Steel ◽

Energy Density ◽

Laser Power ◽

316L Stainless Steel ◽

Scanning Speed ◽

Micro Structure ◽

Technological Parameters ◽

Product Density ◽

Air Bubble ◽

Test Verification

With different process parameters (laser power, scanning speed and scanning distance),the low-time defects of forming part were studied by microscope,including air bubble, pore, micro-crack and macro-crack. The formation mechanism of pore-defect was analyzed. The micro-structure and composition of the pore-defect were studied by means of SEM and EDS. The results showed that the porosity mainly included circular air porosity, irregular process porosity and oxide inclusion.Linear energy density (E=P/v) was introduced as synthetic parameter.According to analysis and test verification, the optimum technological parameters of 316L stainless steel were laser power 190-210KW, laser speed 800-1000mm/s and scanning interval 0.9-0.11mm,and the linear energy density was about 200J/m. There were no cracks, no bubbles, a small amount of porosity, and the product density reached 99.7%.

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Effect of scanning speed on the microstructure and mechanical behavior of 316L stainless steel fabricated by selective laser melting

Materials & Design ◽

10.1016/j.matdes.2019.108355 ◽

2020 ◽

Vol 186 ◽

pp. 108355 ◽

Cited By ~ 13

Author(s):

Jiangwei Liu ◽

Yanan Song ◽

Chaoyue Chen ◽

Xiebin Wang ◽

Hu Li ◽

...

Keyword(s):

Stainless Steel ◽

Mechanical Behavior ◽

Selective Laser Melting ◽

316L Stainless Steel ◽

Scanning Speed ◽

Laser Melting

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Corrosion and Cytotoxicity Evaluation of AISI 316L Stainless Steel Produced by Powder Injection Molding (PIM) Technology

Materials Science Forum ◽

10.4028/www.scientific.net/msf.498-499.86 ◽

2005 ◽

Vol 498-499 ◽

pp. 86-92 ◽

Cited By ~ 3

Author(s):

Isolda Costa ◽

Sizue Ota Rogero ◽

Olandir Vercino Correa ◽

Clarice Terui Kunioshi ◽

Mitiko Saiki

Keyword(s):

Stainless Steel ◽

Injection Molding ◽

316L Stainless Steel ◽

Electrochemical Techniques ◽

Powder Injection Molding ◽

Powder Injection ◽

Cytotoxicity Test ◽

Aisi 316L ◽

Aisi 316L Stainless Steel

This study investigates the in vitro corrosion and cytotoxicity response of AISI 316L stainless steel produced by powder injection molding (PIM) technology in a solution that simulates physiological fluids (MEM) by electrochemical techniques and neutral red uptake cytotoxicity assay. The results were compared with those of AISI 316L produced by conventional metallurgy. Both steels showed high corrosion resistance and no toxic effect in the cytotoxicity test. The corrosion products were analyzed by instrumental neutron activation analysis (INAA). The surfaces of the alloys were evaluated before and after corrosion test by scanning electron microscopy and a passive behaviour was indicated supporting the results from other techniques.

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In Vitro Biocompatibility of a New High Nitrogen Nickel Free Austenitic Stainless Steel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.342-343.605 ◽

2007 ◽

Vol 342-343 ◽

pp. 605-608 ◽

Cited By ~ 9

Author(s):

Yi Bin Ren ◽

Hua Juan Yang ◽

Ke Yang ◽

Bing Chun Zhang

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Blood Compatibility ◽

Platelet Rich Plasma ◽

Clotting Time ◽

Adhesion Test ◽

High Nitrogen ◽

In Vitro Biocompatibility ◽

Time Test

The in vitro blood compatibility of a new nickel free high nitrogen austenitic stainless steel Fe-Cr-Mn-Mo-N (BIOSSN4) was studied by the kinetic clotting time test and the platelet rich plasma adhesion test in this paper. In comparison with 316L stainless steel, the kinetic clotting time of BIOSSN4 steel are longer, and only causes less activation of platelets in platelet adhesion test, which was indicated by their morphology and low spreading. The experimental results reveals that the BIOSSN4 stainless steel has better blood compatibility, the blood compatibility mechanism of steels was analyzed based on surface tension and interfacial tension between the steels and blood.

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Electrochemical and in vitro behaviour of sol–gel coated 316L stainless steel

Corrosion Science ◽

10.1016/s0010-938x(03)00185-9 ◽

2004 ◽

Vol 46 (4) ◽

pp. 795-806 ◽

Cited By ~ 56

Author(s):

J. Gallardo ◽

A. Durán ◽

J.J. de Damborenea

Keyword(s):

Stainless Steel ◽

316L Stainless Steel ◽

Sol Gel

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In Vitro Behavior and Surface Morphology of Modified 316L Stainless Steel Stents

Microscopy and Microanalysis ◽

10.1017/s1431927608089307 ◽

2008 ◽

Vol 14 (S3) ◽

pp. 35-36 ◽

Cited By ~ 2

Author(s):

J. Nunes ◽

A.P. Piedade ◽

C.B. Duarte ◽

M.T. Vieira

Keyword(s):

Stainless Steel ◽

316L Stainless Steel ◽

Cardiovascular Surgery ◽

Research Work ◽

Bare Metal Stents ◽

Metal Stents ◽

Metallic Stent ◽

Stent Restenosis ◽

Drug Eluting

When compared with conventional bare metal stents, such as 316L stainless steel, the introduction of drug-eluting stents can promote reduction in the incidence of in-stent restenosis. However, the chemical discrepancy between the metallic stent and the polymeric material that acts as the reservoir for the drug is responsible for some problems during the cardiovascular surgery. Besides the research work aiming at the development of new bulk alloys for stent production, focus as been also directed to the surface modification of these devices. However, the use of functional graded coatings (FGC), i.e., coatings with a gradient of chemical composition between the substrate and the outmost layer, has never been reported in devices for cardiovascular surgery.

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