scholarly journals Effect of Grain Refinement on the Corrosion Resistance of 316L Stainless Steel

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7517
Author(s):  
Ewa Ura-Bińczyk
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Minor Effect ◽  
Uniform Corrosion ◽  
Pitting Corrosion Resistance ◽  
Before And After ◽  
The Matrix ◽  
The Stability ◽  
A Minor

The effect of hydrostatic extrusion (HE) on the microstructure, uniform corrosion, and susceptibility to a localized attack of 316L stainless steel was studied. Both qualitative and quantitative analyses of inclusions before and after HE were carried out. The multiplication of non-metallic inclusions after HE lowered the stability of the passive film over a broad range of pH, while refinement of the matrix had a minor effect on it. The refined materials were prone to metastable pitting, but their pitting corrosion resistance was improved.

scholarly journals The Effect of Niobium Addition on Mechanical Properties and Corrosion Resistance of a Medical Grade SS316L

2021 ◽  
Vol 21 (2) ◽  
pp. 178
Author(s):  
I Nyoman Jujur ◽  
Sri Endah Susilowati ◽  
Seto Roseno ◽  
Agus Hadi Santosa Wargadipura
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Raw Materials ◽  
Melting Furnace ◽  
Induction Melting ◽  
Before And After ◽  
Medical Grade

To improve mechanical properties, especially elongation, of as-cast medical grade 316L stainless steel, niobium (Nb) was introduced into the alloys, followed by solution heat treatment. Alloying was performed using a 250 kg air induction melting furnace with duplex raw materials and ferronickel. Heat treatment using a solution at 1040 oC, with a holding time of 45 minutes, and water quenching was used. The sample was tested using hardness and ultimate tensile machines. Corrosion tests with simulated body fluids were carried out using media with similar corrosion conditions to human blood. Microstructure observations were performed optically. The results show that the addition of Nb increases the hardness of medical grade 316L stainless steel by 6% compared to the unalloyed steel, both before and after heat treatment. The addition of Nb increases the tensile strength by 8% compared to non-heat treated steel and increases the elongation before and after heat treatment by 8% and 5%, respectively. However, the corrosion rate of the material with Nb is higher than without the addition of Nb. Nb as a carbide former improves the mechanical properties of medical grade 316L stainless steel but adversely affects its corrosion resistance

scholarly journals Corrosion Resistance Measurement of 316L Stainless Steel Manufactured by Selective Laser Melting

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4509
Author(s):  
Rigoberto Guzmán-Nogales ◽  
Francisco Estupiñán-López ◽  
Citlalli Gaona-Tiburcio ◽  
Omar E. Lopez-Botello ◽  
Juan G. Ramírez-Rodríguez ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Selective Laser Melting ◽  
316L Stainless Steel ◽  
Electrochemical Techniques ◽  
Localized Corrosion ◽  
Corrosion Mechanism ◽  
Uniform Corrosion ◽  
Laser Melting ◽  
New Era

Selective laser melting (SLM) technology is ushering in a new era of advanced industrial production of metal components. It is of great importance to understand the relationship between the surface features and electrochemical properties of manufactured parts. This work studied the influence of surface orientation on the corrosion resistance of 316L stainless-steel (SS) components manufactured with SLM. The corrosion resistance of the samples was measured using linear polarization resistance (LPR) and electromechanical noise (EN) techniques under three different environments, H2O, 3.5 wt.% NaCl, and 20% H2OSO4,, analyzing the horizontal (XY) and vertical (XZ) planes. The microstructure and morphology of the samples were obtained by optical (OM) and scanning electron microscopy (SEM). The obtained microstructure showed the grains growing up from the fusion line to the melt pool center and, via SEM-EDS, the presence of irregular and spherical pores was observed. The highest corrosion rate was identified in the H2SO4 solution in the XZ plane with 2.4 × 10−2 mm/year and the XY plane with 1.31 × 10−3 mm/year. The EN technique along with the skewness factor were used to determine the type of corrosion that the material developed. Localized corrosion was observed in the electrolyte, for the XY and XZ planes (−1.65 and −0.012 skewness factors, respectively), attacking mainly the subgrains of the microstructure and, in some cases, the pores, caused by Cl ions. and solutions presented a uniform corrosion mechanism for the two observed orientations. The morphology identified by SEM was correlated with the results obtained from the electrochemical techniques.

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