Corrosion resistance of high-Mn austenitic steels for the automotive industry

Grajcar, A.

doi:10.5772/34195

Cited by 17 publications

(28 citation statements)

References 23 publications

(41 reference statements)

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“…During the corrosion of Fe-25Mn, a large amount of Fe 2+ and Mn 2+ were released into the solution, and subsequently formed insoluble hydroxides which would deposited on the surface. Hydrogen depolarization would occur and form hydrogen gas, which resulted in the formation of corrosion pits in which hydrogen gas were released [49]. Thus, cracked corrosion layer was easily formed on the corroded surface.…”

Section: The Degradation Behavior Of Fe-mn Scaffoldmentioning

confidence: 99%

Selective laser melted Fe-Mn bone scaffold: microstructure, corrosion behavior and cell response

Shuai

Yang

et al. 2020

Mater. Res. Express

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Iron metal possesses good biocompatibility and excellent mechanical strength, though it degrades too slowly. In this work, selective laser melting (SLM) was applied to fabricate iron-manganese (Fe-Mn) biodegradable scaffold. Results shown Fe-Mn scaffold exhibited a uniform pore structure with a porosity of 66.72±2.3%, which highly matched with as-designed model. Phase analysis revealed Fe-Mn scaffold mainly contained α-Fe, martensitic and austenitic phases. Due to the potential difference among these different phases, galvanic corrosion occurred in Fe matrix. In addition, a small amount of Mn distributed at grain boundaries also contributed to the formation of galvanic corrosion. Thus, the corrosion rate increased from 0.09±0.02 mm/year to 0.23±0.05 mm/year. The scaffold exhibited suitable mechanical properties with a yield strength of 137±8.4 MPa, an ultimate strength of 221.7±10.9 MPa. Moreover, cell assays demonstrated its good cytocompatibility. Taking these positive results into consideration, SLM processed Fe-Mn scaffold was a promising material for bone repair application.

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Section: The Degradation Behavior Of Fe-mn Scaffoldmentioning

confidence: 99%

Selective laser melted Fe-Mn bone scaffold: microstructure, corrosion behavior and cell response

Shuai

Yang

et al. 2020

Mater. Res. Express

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“…These steels are less sensitive to corrosion attack in solutions of pH about 14. In our previous works [17][18][19] we reported that high-Mn austenitic steels showed higher corrosion current density during potentiodynamic polarization tests in 0.1M H 2 SO 4 than in 3.5% NaCl solution. Opiela et al [20] observed the presence of numerous corrosion pits formed in steels after corrosion tests in both solutions.…”

Section: Introductionmentioning

confidence: 84%

“…The values of corrosion potentials were: -398 mV and -420 mV for the steels containing lower and higher Al content, respectively. It is documented in literature [17][18][19]31,32,36,37] that in general, cold deformation decreases corrosion resistance of steels. It is reflected in higher values of corrosion current density (I corr ).…”

Section: Methodsmentioning

confidence: 99%

Untitled

Kozłowska

Grajcar

2016

Archives of Materials Science and Engineering

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Purpose: The aim of the paper is to compare the corrosion properties of two high-Mn austenitic steels with various Al and Si additions in 0.1M NaOH solution using a potentiodynamic method. Design/methodology/approach: The steels used for the investigation were thermomechanically rolled in 3 passes. The final thickness of about 2 mm was obtained at a temperature of 850°C. Three groups of samples were prepared: thermomechanically rolled, thermomechanically rolled and additionally annealed at 900°C for 20 min, thermomechanically rolled and additionally cold deformed in static tensile test to total elongation of 36%. Corrosion resistance of investigated steels was examined using the potentiodynamic method. The metallographic inspection of corrosion damage included scanning electron microscope observations. The chemical analyses of the corrosion pits were carried out using EDS techniques. Findings: It was found that X4MnSiAlNbTi27-4-2 and X6MnSiAlNbTi26-3-3 steels were characterized by relatively high corrosion resistance in 0.1M NaOH solution independently of their state. EDS analysis revealed that corrosion pits nucleated preferentially at nonmetallic inclusions such as MnS and AlN. Results of potentiodynamic tests showed that cold deformation had the highest influence on decreasing the corrosion resistance of investigated steels. Thermomechanically treated and supersaturated specimens showed lower values of corrosion current density and consequently less amount of corrosion damage. Research limitations/implications: To investigate in more detail the corrosion behaviour of high-manganese austenitic steels, the impedance spectroscopy investigations will be carried out. Practical implications: The knowledge of the corrosion resistance of high-Mn steels has a significant effect on their industrial application in the automotive industry. Originality/value: The corrosion resistance of two high-manganese austenitic steels with different initial microstructures was compared in alkaline solution.

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“…Additionally, manganese refines the produced microstructure due its depression of transformation temperature, besides its ability to decrease the critical cooling rate during hardening. [7][8] Nitrogen is a very effective austenite forming element that enlarges the austenite phase field on a phase diagram on the expense of ferrite. [9] Beside the strong stability effect on the austenitic structure, other benefits of nitrogen have been appeared.…”

Section: Introductionmentioning

confidence: 99%

Low Activation-Modified High Manganese-Nitrogen Austenitic Stainless Steel for Fast Reactor Pressure Vessel Cladding

Saeed¹

2018

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Low and free nickel austenitic stainless steel alloys were developed successfully and proposed to be used as a liquid sodium coolant fast reactor pressure vessel cladding. A standard austenitic stainless steel SS316L (AISI 316L) was produced as a reference sample. The nickel content was partially or totally replaced by manganese and nitrogen. The microstructure of the produced stainless steel alloys was investigated using Schaeffler diagram, optical microscopy and X-ray diffraction patterns (XRD). Mechanical properties of the developed stainless steel grads were investigated using Vickers hardness, impact and tensile tests at room temperature. Sodium chloride was used to study the corrosion rate of the investigated alloys by open circuit potential technique. Slow and total slow neutrons removal cross sections were measured using 241 Am-Be neutron source and highly calibrated He-3 detector. Eight gamma ray lines which emitted from 60 Co and 232 Th radioactive sources and HPGe detector were used to study the attenuation parameters of the produced alloys. Metallography, Schaeffler diagram and XRD results showed that all the produced stainless steels are mainly of austenite phase with a small ferrite phase. The developed manganese-nitrogen stainless steels showed higher hardness, yield and ultimate tensile strength than SS316L. The elongation of developed stainless steels is relatively lower than the standard SS316L. The impact toughness was reduced with replacement of Ni by Mn. The developed manganese stainless steels have a higher total slow removal cross section than SS316L. On the other hand, the slow neutron and gamma rays have nearly the same behavior for all studied stainless steels.

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Corrosion resistance of high-Mn austenitic steels for the automotive industry

Cited by 17 publications

References 23 publications

Selective laser melted Fe-Mn bone scaffold: microstructure, corrosion behavior and cell response

Selective laser melted Fe-Mn bone scaffold: microstructure, corrosion behavior and cell response

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Low Activation-Modified High Manganese-Nitrogen Austenitic Stainless Steel for Fast Reactor Pressure Vessel Cladding

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