On the effect of Mn-content on the strength-ductility balance in Ni-free high N transformation induced plasticity steels

Khorrami, Mahsa; Hanzaki, A Zarei; Abedi, H.R.; Moallemi, Mohammad; Chen, Guanghui

doi:10.1016/j.msea.2021.141260

Cited by 18 publications

(5 citation statements)

References 44 publications

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“…The composition of Ni as a stabilizer of austenite is relatively low, but the function of Ni is replaced by Mn so that the composition is relatively high. Reducing the composition of Ni by 1% must be replaced by adding 2% Mn to achieve austenite stability [20]- [24].…”

Section: Resultsmentioning

confidence: 99%

Dynamic Plastic Deformation Induced by Repetitive Hammering on Cr-Mn Austenitic Stainless Steel

Triadi

Selindiana

Judawisastra

et al. 2022

metal.

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Austenitic stainless steels have advantages, such as high ductility and good corrosion resistance. The cold working process can increase the hardness and strength of the material. However, because a metastable austenite phase occurs in that material, there is a phase change of γ austenite to α’-martensite and ε-martensite, which will reduce the ductility and its corrosion resistance. The strengthening process with dynamic plastic deformation (DPD) can prevent the formation of martensitic phases through repeated impact at high strain rates. This study analyzed microstructures and hardness evaluation on Cr-Mn austenitic stainless steel due to dynamic plastic deformation through the repetitive hammering method. Repetitive hammering with a strain rate of 6,2 s-1 on Cr-Mn austenitic stainless steels was carried out on five specimens with variations in the impact of 50, 100, 150, 250, and 350 times with impact energy of 486 J/cm2, 2.207 J/cm2, 2.569 J/cm2, 6.070 J/cm2, and 11.330 J/cm2 respectively. Microstructure, hardness, and XRD (X-ray diffraction) analyses were carried out on specimens before and after repetitive hammering. Metallography was carried out to observe the microstructure using an optical microscope. The hardness was tested through the Rockwell A hardness test. XRD examination was used to identify the phases formed and indications of nano-twins. The repetitive hammering process up to 350 times has succeeded in increasing hardness from 53.5 HRA to 71.6 HRA. Plastic deformation introduced by repetitive hammering produced slip bands, cross bands, wavy bands, and indication of nano-twins formation and increased the hardness.

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Section: Resultsmentioning

confidence: 99%

Dynamic Plastic Deformation Induced by Repetitive Hammering on Cr-Mn Austenitic Stainless Steel

Triadi

Selindiana

Judawisastra

et al. 2022

metal.

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“…Adding the Mn element will increase the solubility of the N element. And, the N element is very easy to combine with the Al element, forming a harmful AlN phase [ 9 , 18 , 24 , 25 ]. This process will consume a large amount of Al, which may be the reason for the disappearance of the NiAl phase in the HC-3 alloy compared with the HC-2 alloy.…”

Section: Phase Composition and Microstructurementioning

confidence: 99%

“…This is in agreement with the results of Mn substituting for Ni in traditional austenitic steels. The addition of Mn can make austenite more uniform and stable, increase the stacking fault energy in austenitic steel, promote dislocation sliding and plastic deformation, reduce the work hardening rate and hardness, and increase elongation at room temperature [ 14 , 24 ].…”

Section: Tensile Properties and Creep Resistancementioning

confidence: 99%

The Effect of Replacing Ni with Mn on the Microstructure and Properties of Al2O3-Forming Austenitic Stainless Steels: A Review

Chen,

Du,

Zhou

2023

Materials

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Al2O3-forming austenitic steel (AFA steel) is an important candidate material for advanced reactor core components due to its excellent corrosion resistance and high temperature strength. Al is a strong ferrite-forming element. Therefore, it is necessary to increase the Ni content to stabilize austenite. Ni is expensive and highly active, and so increasing the Ni content not only increases the costs but also damages the radiation resistance. Mn is a low-cost austenitic stable element. Its substitution for Ni will not only help to improve the irradiation resistance of austenitic steel, but also reduce the cost. In order to explore the feasibility of Mn-substituted Ni-stabilized austenite in AFA steel, this paper summarized the research progress of Mn-added AFA steels, whilst the research status of traditional Mn-added austenitic steels are also referred to and compared herein. The effect of the addition of Mn on the microstructure and properties of AFA steel was analyzed. The results show that Mn can promote the precipitation of the M23C6 phase and inhibit the precipitation of the B2-NiAl phase and secondary NbC phase. With the increase in Mn content, the strength of AFA steel at room temperature and high temperature decreased slightly, the room temperature elongation increased slightly, while the high temperature elongation and creep resistance decreased obviously. In addition, for austenitic steel free of Al, the addition of Mn will destroy the oxide layer of Cr2O3, which will decrease the oxidation resistance of the steel. But the preliminary study shows that Mn has little effect on the Al2O3 oxide layer. It is worth studying the effect of Mn-substituted Ni on the oxidation resistance of AFA steel. In summary, more efforts are necessary to investigate the optimal Mn content to balance the advantages and disadvantages of introducing Mn instead of Ni.

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“…[16,28] The distribution of retained austenite in the microstructure can be altered by the processing history and initial microstructure and it is an important factor in the response of TRIP steels. [29][30][31] Since the TRIP steels are usually processed by high-temperature thermomechanical processing followed by cold rolling and finial TRIP heat treatment, the preceding hot-rolling route [32,33] and cooling from the hot-rolling temperature to the ambient temperature might significantly change the initial microstructure and mechanical properties of steels. [34] Regarding the copper-added TRIP-aided multiphase steels, the effects of thermomechanical processing history on the mechanical properties should be further studied for optimization of mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the Mechanical Properties of Copper‐Added Transformation‐Induced Plasticity‐Aided Multiphase Steel by Thermomechanical Processing

Deldar,

Mirzadeh,

Habibi Parsa

2023

steel research int.

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The microstructure and mechanical properties of a low‐alloy Cu‐bearing transformation‐induced plasticity (TRIP) steel and their dependence on the processing history were investigated in the present work. The distributions of the retained austenite and bainite were found to be dependent on the initial cold‐rolled microstructure, which can be tailored by the preceding hot rolling route (unidirectional/cross rolling) and the subsequent cooling rate (furnace/air cooling). Mechanical properties and TRIP effect strongly depended on the initial microstructure, where the air cooled sheet showed remarkable mechanical properties; while the cross rolled sheet showed isotropic properties. The addition of copper resulted in an increase in the amount of the retained austenite, enhancement of strength‐ductility balance, and improvement of the hardening behavior of TRIP‐assisted high‐performance steel.This article is protected by copyright. All rights reserved.

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On the effect of Mn-content on the strength-ductility balance in Ni-free high N transformation induced plasticity steels

Cited by 18 publications

References 44 publications

Dynamic Plastic Deformation Induced by Repetitive Hammering on Cr-Mn Austenitic Stainless Steel

Dynamic Plastic Deformation Induced by Repetitive Hammering on Cr-Mn Austenitic Stainless Steel

The Effect of Replacing Ni with Mn on the Microstructure and Properties of Al2O3-Forming Austenitic Stainless Steels: A Review

Tailoring the Mechanical Properties of Copper‐Added Transformation‐Induced Plasticity‐Aided Multiphase Steel by Thermomechanical Processing

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