Mechanical and Electrochemical Characterization of Super-Solidus Sintered Austenitic Stainless Steel (316L)

AbstractThe present study compares the mechanical and electrochemical behaviour of austenitic (AISI 316L) stainless steel compacted at various pressures (200, 400 and 600 MPa) and conventionally sintered at super-solidus temperature of 1,400°C. The electrochemical behaviour was investigated in 0.1 N H2SO4 solution by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The shrinkage decreased and densification has been increased with increasing pressure. The mechanical and electrochemical behaviour with pressure has been correlated with densification response and microstructure (pore type, volume and morphology). Highest densification (~92% theoretical) achieved at 600 MPa (compaction pressure) and 1,400°C (sintering temperature) resulted in excellent combination of tensile strength and ductility (456 ± 40 MPa, 25 ± 1.1%), while showing excellent corrosion resistance (0.1 mmpy or 4.7 mpy).

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Corrosion Resistance of AISI 316L Stainless Steel Biomaterial after Plasma Immersion Ion Implantation of Nitrogen

Materials ◽

10.3390/ma14226790 ◽

2021 ◽

Vol 14 (22) ◽

pp. 6790

Author(s):

Viera Zatkalíková ◽

Juraj Halanda ◽

Dušan Vaňa ◽

Milan Uhríčik ◽

Lenka Markovičová ◽

...

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Ion Implantation ◽

316L Stainless Steel ◽

Electrochemical Impedance ◽

Austenitic Stainless Steels ◽

Aisi 316L ◽

Corrosion Properties ◽

Aisi 316L Stainless Steel ◽

Plasma Immersion Ion Implantation

Plasma immersion ion implantation (PIII) of nitrogen is low-temperature surface technology which enables the improvement of tribological properties without a deterioration of the corrosion behavior of austenitic stainless steels. In this paper the corrosion properties of PIII-treated AISI 316L stainless steel surfaces are evaluated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PP) and exposure immersion tests (all carried out in the 0.9 wt. % NaCl solution at 37 ± 0.5 °C) and compared with a non-treated surface. Results of the three performed independent corrosion tests consistently confirmed a significant increase in the corrosion resistance after two doses of PIII nitriding.

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Study onCorrosion Behaviour of AISI 316L Stainless Steel Treated with Air Cold Plasma

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.1119 ◽

2009 ◽

Vol 79-82 ◽

pp. 1119-1122

Author(s):

Qi Wang ◽

Hong Ren Wang ◽

Cong Jie Gao ◽

Feng Liu

Keyword(s):

Stainless Steel ◽

Cold Plasma ◽

316L Stainless Steel ◽

Electrochemical Impedance ◽

Ferric Chloride Solution ◽

Sample Surface ◽

Corrosion Mechanism ◽

Plasma Oxidation ◽

Aisi 316L Stainless Steel ◽

Potentiodynamic Polarization Curves

Pitting resistance of air cold plasma-oxidation 316L stainless steel was evaluated by exposing the specimens into a ferric chloride solution. The results indicate that the pitting resistance of plasma-oxidized specimens improved obviously. Potentiodynamic polarization curves were measured to study its corrosion behavior. The corrosion mechanism was also interpreted by electrochemical impedance spectroscopy (EIS) and Auger electron spectroscopy (AES).The results reveal that the oxide layer formed by the plasma treatment is much thicker than that without treatment and is double-deck structure, which leads to the change of EIS characteristic of sample surface.

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Mechanical and Electrochemical Characterization of Supersolidus Sintered Austenitic Stainless Steel (316 L)

High Temperature Materials and Processes ◽

10.1515/htmp-2019-0032 ◽

2019 ◽

Vol 38 (2019) ◽

pp. 792-805 ◽

Cited By ~ 1

Author(s):

S. Ramakrishna Kandala ◽

Kantesh Balani ◽

Anish Upadhyaya

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Electrochemical Impedance ◽

Rupture Strength ◽

Electrochemical Behaviour ◽

Compaction Pressure ◽

316 L Stainless Steel ◽

Aisi 316 ◽

Stainless Steel 316 ◽

Aisi 316 L

AbstractThe present study compares the mechanical properties and electrochemical behaviour of austenitic (AISI 316 L) stainless steel compacted at different pressures (200, 400 and 600 MPa), which are conventionally sintered at supersolidus temperature of 1,400°C. As expected, increase in compaction pressure (from 200 MPa) to 600 MPa has shown decreased shrinkage (from 7.3% to 4.2% radial and 5.5% to 3.4% axial, respectively) and increased densification (up to ~92%). Their electrochemical behaviour was investigated in 0.1 N H2SO4 solution by potentiodynamic polarization and electrochemical impedance spectroscopy. The mechanical properties (such as yield-, tensile- and transverse rupture strength) and electrochemical behaviour with pressure have been correlated with densification response and microstructure (pore type, volume and morphology). Highest densification (~92% theoretical) achieved at 600 MPa (compaction pressure) and 1,400°C (sintering temperature) resulted in excellent combination of tensile strength and ductility (456 ± 40 MPa and 25 ± 1.1% respectively), while showing lowest corrosion rate (0.1 mmpy or 4.7 mpy) due to the presence of isolated porosity in the sintered samples.

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