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Corrosion behaviour of Fe-Mn-Si-Al austenitic steel in chloride solution  [PDF]
M. Opiela,A. Grajcar,W. Krukiewicz
Journal of Achievements in Materials and Manufacturing Engineering , 2009,
Abstract: Purpose: The aim of the paper is to investigate the corrosion behaviour of the new-developed high-manganese austenitic steel in 0.5n NaCl solution.Design/methodology/approach: The steel used for the investigation was thermomechanically rolled and solution heat-treated from a temperature of 850°C. Corrosion resistance of investigated steel was examined using weight and potentiodynamic methods. In the weight method, the specimens were immersed in the prepared solution for 24h. In the potentiodynamic method, anodic polarization curves with a rate of potential changes of 1 mV/s in the anodic direction were registered. After the current density being equal 1 mA/cm2 was achieved, the direction of polarization has been changed. Basing on the registered curves, the pitting potential, repassivation potential, polarization resistance and corrosion current were determined.Findings: It was found that the steel is characterized by a partially recrystallized austenitic microstructure with numerous annealing twins and slip bands. According to the results of potentiodynamic analyses it was found that the samples of examined steel show poor corrosion resistance in the NaCl solution. The observed corrosion pits are related to the chemical composition. It is connected with the high dissolution rate of Mn and Fe atoms in NaCl solution. Fractographic analyses of samples revealed corrosion products on their surface in a form of pits with diversified size.Research limitations/implications: To investigate in more detail the corrosion behaviour of high-manganese steel, the investigations should include steels with a wider Al concentration.Practical implications: The obtained results can be used for searching the appropriate way of improving the corrosion resistance of a modern group of high-manganese austenitic steels.Originality/value: The corrosion behaviour in chloride solution of a new-developed Fe-Mn-Si-Al steel was investigated.
AN INVESTIGATION ON AN AUSTENITIC Fe-Mn-Al HEAT-RESISTING STEEL

CHANG YEN-SHEN,SHIH CHANG-HSU,LI YOU-K'E,

金属学报 , 1965,
Abstract:
AN INVESTIGATION ON A Cr-Mn-N AUSTENITIC HEAT-RESISTING STEEL

金属学报 , 1966,
Abstract:
Mechanism of Work-hardening for Austenitic Manganese Steel under Non-severe Impact Loading Conditions
XIE Jingpei JIANG Qichuuan HE Zhenming LUO Quanshun KSommer Luoyang Institute of Technology,Luoyang,China Stuttgart University,Germany To whom correspondence should be addressed,
谢敬佩
,姜启川,何镇明,hun

材料科学技术学报 , 1992,
Abstract: The effect of C,Mn and heat-treatment on work-hardening of austenitic Mn steel and the work-hardening mechanism have been investigated under non-severe impact loading condition.The results show that the ability of work-hardening in- creases with the increase of C and aging tempera- ture but decreases with Mn.The work-hardening with high austenitic stability results mainly from dislocations,and that with low austenitic stability results mainly from combined effects of strain-in- duced martensite and high density of dislocations under non-severe impact loading conditions.The wear resistance of medium manganese steel (Mn7) is 1.64-2.46 times that of Hadfield steel (Mnl3).
Effect of rare earth and alloying elements on the thermal conductivity of austenitic medium manganese steel  [PDF]
Shao-chun Chen,Hong-xiang Ye,Xin-qiang Lin
- , 2017, DOI: https://doi.org/10.1007/s12613-017-1449-7
Abstract: The influence of different contents of Cr, Mo, and rare earth element (RE) additives on the thermal conductivity of austenitic medium manganese steel was studied and discussed. The results show that the addition of Cr in medium manganese steel can improved the ordering of C–Mn atomic clusters, so as to improve the steel’s thermal conductivity. However, Cr will lead to precipitation of a great deal of carbides in medium manganese steel when its content is greater than 4wt%. These carbides would aggregate around the grain boundary, and as a result, the thermal conductivity is decreased. By the addition of Mo whose content is about 2wt%, spherical carbides will be formed, thus improving the thermal conductivity of the medium manganese steel. The interaction between rare earth elements and alloying elements will raise both the thermal conductivity and the wear-resisting property of medium manganese steel.
Local Nanocrystallization in a Cr-Mn-N Austenitic Stainless Steel Caused by Cavitation

Zhechang WANG,Xiaoqiang ZHANG,Huaining CHEN,

材料科学技术学报 , 2001,
Abstract: Many nanocrystallized areas have been found with transmission electron microscope (TEM) in a Cr-Mn-N austenitic stainless steel after cavitation erosion. It has been found that the nanocrystallized areas were formed in the severe cavitation zone and the grain size was about 25 nm. A possible nanocrystallization mechanism is given.
Influence of Partial Replacement of Nickel by Nitrogen on Microstructure and Mechanical Properties of Austenitic Stainless Steel  [PDF]
A. Ahmed,S. N. Ghali,M. Eissa,S. A. El Badry
Journal of Metallurgy , 2011, DOI: 10.1155/2011/639283
Abstract: A new modified austenitic stainless steel has been developed through partial replacement of nickel by nitrogen. Nitrogen stainless steel was produced in 10?kg induction furnace under nitrogen pressure, while reference one, AISI 316 steel grade, was produced in open-induction furnace. Both were cast and hot forged, and the total nitrogen was determined. Furthermore, the produced forged steels were subjected to solution treatment at different temperatures. The microstructure of produced stainless steels was observed. The X-ray diffractmeter and Mossbauer effect spectroscopy were used to follow the phase change in reference and modified steels after different heat treatment temperatures. The influence of grain-size, soluble, and insoluble nitrogen on tensile strength and hardness was investigated. The major phase in the modified steel has a fcc structure similar to the reference one, but with finer grains and more expanded lattice. The yield strength and hardness of the nitrogen-modified stainless steel are higher than the reference steel. On the other hand, the increase of nitrogen content deteriorates the steel ductility. 1. Introduction Over the past few decades, there is a trend in the that world aims at the replacement of nickel by nitrogen as an austenitic stabilizer element [1–4], as nitrogen is considered as the strongest austenitic stabilizer element among all the austenitic stabilizers, that is, C, Mn, Ni, and Cu. The partial replacement of nickel by nitrogen increases mechanical properties, besides the improvement of corrosion resistance [5]. High-nitrogen stainless steels can be produced in the liquid state [6] by different techniques such as induction furnace, electric arc furnace, gas bubbling in liquid steels, pressure electroslag remelting (PESR), plasma arc melting, and arc-slag melting. Each melting technique has advantages and disadvantages. For example, PESR is complicated and expensive. On the other hand, nitrogen gas alloying and addition of nitrided ferroalloys under normal atmospheric conditions is a simple and feasible method, but the nitrogen content of produced steel is limited. To increase the nitrogen content, the nitrogen partial pressure must be increased. This can take place through melting in induction furnace under nitrogen pressure [6]. The main problem—faced by steel-making researchers—is not only how to introduce nitrogen into molten stainless steel but also how to keep it during the solidification and heat treatment. This paper aims at developing an innovating grade of austenitic stainless steel by nickel partial
Thermomechanical Behavior Modeling of a Cr-Ni-Mo-Mn-N Austenitic Stainless Steel  [PDF]
Rafael P. Ferreira, Eden S. Silva, Carmem C. F. Nascimento, Samuel F. Rodrigues, Clodualdo Aranas Jr., Valdemar S. Leal, Gedeon S. Reis
Materials Sciences and Applications (MSA) , 2016, DOI: 10.4236/msa.2016.712062
Abstract: The analytical approach and the thermomechanical behavior of a Cr-Ni-Mo-Mn-N austenitic stainless steel were characterized based on the parameters of work hardening (h), dynamic recovery (r) and dynamic recrystallization (n, t0.5), considering constitutive equations (σ, ε) and deformation conditions expressed according to the Zener-Hollomon parameter (Z). The results indicated that the curves were affected by the deformation conditions and that the stress levels increased with Z under high work hardening rates. The σc/σp ratio was relatively high in the first part of the curves, indicating that softening was promoted by intense dynamic recovery (DRV). This was corroborated by the high values of r and average stacking fault energy, γsfe = 66.86 mJ/m2, which facilitated the thermally activated mechanisms, increasing the effectiveness of DRV and delaying the onset of dynamic recrystallization (DRX). The second part of the curves indicates that there was a delay in the kinetics of dynamic softening, with a higher value of t0.5 and lower values of the Avrami exponent (n) due to the competing DRV-DRX mechanisms, and steady state stress (σss) was achieved under higher rates of deformation.
EFFECT OF Nb ON LONG-TIME AGING STABILITY OF AN AUSTENITIC HEAT RESISTING STEEL 37Mn31Al3Cr2MoVWNbB

金属学报 , 1984,
Abstract:
Relationship between the microstructure and properties of thermomechanically processed Fe?17Mn and Fe?17Mn?3Al steels  [PDF]
Renuprava Dalai,Siddhartha Das,Karabi Das
- , 2019, DOI: https://doi.org/10.1007/s12613-019-1710-3
Abstract: Two austenitic Mn steels (Fe?17Mn and Fe?17Mn?3Al (wt%, so as the follows)) were subjected to thermomechanical processing (TMP) consisting of forging followed by solutionization and hot rolling. The rolled samples were annealed at 650 and 800°C to relieve the internal stress and to induce recrystallization. The application of TMP and heat treatment to the Fe?17Mn/Fe?17Mn?3Al steels refined the austenite grain size from 169 μm in the as-solutionized state to 9–13 μm, resulting in a substantial increase in hardness from HV 213 to HV 410 for the Fe?17Mn steel and from HV 210 to HV 387 for the Fe?17Mn?3Al steel. The elastic modulus values, as evaluated by the nanoindentation technique, increased from (175 ± 11) to (220 ± 12) GPa and from (163 ± 15) to (205 ± 13) GPa for the Fe?17Mn and Fe?17Mn?3Al steels, respectively. The impact energy of the thermomechanically processed austenitic Mn steels was lower than that of the steels in their as-solutionized state. The addition of Al to the Fe?17Mn steel decreased the hardness and elastic modulus but increased the impact energy.
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