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Abstract

The microstructure and mechanical properties of hot-rolled Fe-9Mn-0.2C medium-manganese steels with different Al, Cu, and Ni contents were investigated in this study. Based on the SEM, XRD, and EBSD analysis results, the microstructure was composed of martensite, band-type delta ferrite, and retained austenite phases depending on the Al, Cu, and Ni additions. The tensile and Charpy impact test results showed that the sole addition of Al reduced significantly impact toughness by the presence of delta-ferrite and the decrease of austenite stability although it increased yield strength. However, the combined addition of Al and Cu or Ni provided the best combination of high yield strength and good impact toughness because of solid solution strengthening and increased austenite stability.
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Bibliography

[1] S.I. Lee, S.Y. Lee, J. Han, B. Hwang, Mater. Sci. Eng. A 742, 334-343 (2019).
[2] S.I. Lee, S.Y. Lee, S.G. Lee, H.G. Jung, B. Hwang, Met. Mater. Int. 24, 1221-1231 (2018).
[3] S.Y. Lee, S.I. Lee, B. Hwang, Mater. Sci. Eng. A. 711, 22- 28 (2018).
[4] S.I. Lee, J. Lee, B. Hwang, Mater. Sci. Eng. A. 758, 56-59 (2019). 1011
[5] H . Gwon, S. Shin, J. Jeon, T. Song, S. Kim, B.C.D. Cooman, Met. Mater. Int. 25, 594-605 (2019).
[6] Y. Kwon, J.H. Hwang, H.C. Choi, T.T.T. Trang, B. Kim, A. Zargaran, N.J. Kim, Met. Mater. Int. 26, 75-82 (2020).
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[8] H . Choi, S. Lee, J. Lee, F. Barlat, B.C.D. Cooman, Mater. Sci. Eng. A 687, 200-210 (2017).
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[13] M . Soleimani, H. Mirzadeh, C. Dehghanian, Met. Mater. Int. 26, 882-890 (2020).
[14] S. H. Kim, H. Kim, N. J. Kim, Nature 518, 77-19 (2015).
[15] J.H. Hollomon, Trans. Metall. Soc. AIME, 162, 268-290 (1945).
[16] G E. Dieter, McGraw-Hill, Mechanical Metallurgy, London 1988.
[17] J. Chen, M. Lv, S. Tang, Z. Liu, G. Wang, Mater. Charact. 106, 108-111 (2015).
[18] Y.K. Lee, J. Han, Mater. Sci, Technol. 31, 843-856 (2015).
[19] J. Han, A.K. Silva, D. Ponge, D. Raabe, S.M. Lee, Y.K. Lee, S.I. Lee, B. Hwang, Acta Mater. 122, 199-206 (2017).
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Authors and Affiliations

Young-Chul Yoon
1
ORCID: ORCID
Sang-Gyu Kim
1
ORCID: ORCID
Sang-Hyeok Lee
1
ORCID: ORCID
Byoungchul Hwang
1
ORCID: ORCID

  1. Seoul National University of Science and Technology, Department of Materials Science and Engineering, 232, Gongneung-Ro., Nowon-gu, Seoul 01811, Korea
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Abstract

Cast Hadfield steel is characterised by high abrasion resistance, provided, however, that it is exposed to the effect of dynamic loads.

During abrasion without loading, e.g. under the impact of loose sand jet, its wear resistance drops very drastically. To increase the abrasion

resistance of this alloy under the conditions where no pressure is acting, primary vanadium carbides are formed in the metallurgical

process, to obtain a composite structure after the melt solidification. The primary, very hard, carbides uniformly distributed in the

austenitic matrix are reported to double the wear resistance of samples subjected to the effect of a silicon carbide-water mixture.

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Authors and Affiliations

G. Tęcza
J. Głownia
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Abstract

Cast high-manganese Hadfield steel is commonly used for machine components operating under dynamic load conditions. Their high fracture toughness and abrasive wear resistance is the result of an austenitic structure, which - while being ductile - at the same time tends to surface harden under the effect of cold work. Absence of dynamic loads (e.g. in the case of sand abrasion) causes rapid and premature wear of parts. In order to improve the abrasive wear resistance of cast high-manganese steel for operation under the conditions free from dynamic loads, primary titanium carbides are produced in this cast steel during melting process to obtain in castings, after melt solidification, the microstructure consisting of an austenitic matrix and primary carbides uniformly distributed therein. After heat treatment, the microhardness of the austenitic matrix of such cast steel is up to 580 μHV20 and the resulting carbides may reach even 4000 μHV20. The impact strength of this cast steel varies from 57 to 129 and it decreases with titanium content. Compared to common cast Hadfield steel, the abrasive wear resistance determined in Miller test is at least twice as high for the 0.4% Ti alloy and continues growing with titanium content.

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Authors and Affiliations

R. Zapała
G. Tęcza
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Abstract

Widely used in the power and mining industry, cast Hadfield steel is resistant to wear, but only when operating under impact loads.

Components made from this alloy exposed to the effect of abrasion under load-free conditions are known to suffer rapid and premature

wear. To increase the abrasion resistance of cast high-manganese steel under the conditions where no dynamic loads are operating, primary

titanium carbides are formed in the process of cast steel melting, to obtain in the alloy after solidification and heat treatment, the

microstructure composed of very hard primary carbides uniformly distributed in the austenitic matrix of a hardness superior to the

hardness of common cast Hadfield steel. Hard titanium carbides ultimately improve the wear resistance of components operating under

shear conditions. The measured microhardness of the as-cast matrix in samples tested was observed to increase with the increasing content

of titanium and was 380 HV0.02 for the content of 0.4%, 410 HV0.02 for the content of 1.5% and 510 HV0.02 for the content of 2 and

2.5%. After solution heat treatment, the microhardness of the matrix was 460÷480 HV0.02 for melts T2, T3 and T6, and 580 HV0.02 for

melt T4, and was higher than the values obtained in common cast Hadfield steel (370 HV0.02 in as-cast state and 340÷370 HV0.02 after

solution heat treatment). The measured microhardness of alloyed cementite was 1030÷1270 HV0.02; the microhardness of carbides

reached even 2650÷4000 HV0.02.

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Authors and Affiliations

A. Garbacz-Klempka
G. Tęcza
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Abstract

The present research deals with the effect of pre-strain on the hydrogen embrittlement behavior of intercritically annealed medium-Mn steels. A slow strain-rate tensile test was conducted after hydrogen charging by an electrochemical permeation method. Based on EBSD and XRD analysis results, the microstructure was composed of martensite and retained austenite of which fraction increased with an increase in the intercritical annealing temperature. The tensile test results showed that the steel with a higher fraction of retained austenite had relatively high hydrogen embrittlement resistance because the retained austenite acts as an irreversible hydrogen trap site. As the amount of pre-strain was increased, the hydrogen embrittlement resistance decreased notably due to an increase in the dislocation density and strain-induced martensite transformation.
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Authors and Affiliations

Sang-Gyu Kim
1
ORCID: ORCID
Young-Chul Yoon
1
ORCID: ORCID
Seok-Woo Ko
1
ORCID: ORCID
Byoungchul Hwang
1
ORCID: ORCID

  1. Seoul National University of Science and Technology, Department of Materials Science and Engineering, Seoul, 01811, Republic of Korea
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Abstract

The article aims to characterize Hadfield steel by analyzing its chemical composition, mechanical properties, and microstructure. The study focused on the twinning-induced work hardening of the alloy, which led to an increase in its hardness. The experimental data show that the material hardness at the surface improved considerably after solution heat treatment and work hardening, reaching more than 750 HV. By contrast, the hardness of the material core in the supersaturated condition was about 225 HV. The chemical and phase compositions of the material at the surface were compared with those of the core. The microstructural analysis of the steel revealed characteristic decarburization of the surface layer after solution heat treatment. The article also describes the effects of heat treatment on the properties and microstructure of Hadfield steel. The volumetric (qualitative) analysis of the computed tomography (CT) data of Hadfield steel subjected to heavy dynamic loading helped detect internal flaws, assess the material quality, and potentially prevent the structural failure or damage of the element tested.
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Bibliography

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Authors and Affiliations

Damian Bańkowski
1
ORCID: ORCID
Piotr S. Młynarczyk
1
ORCID: ORCID
Wojciech P. Depczyński
1
ORCID: ORCID
Kazimierz Bolanowski
1
ORCID: ORCID

  1. Kielce University of Technology, Poland

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