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The Combined Influence of Molybdenum and Nickel in Steel Welds

B. Szczucka-Lasota T. Węgrzyn A. Kurc-Lisiecka J. Piwnik
Archives of Metallurgy and Materials | 2018 | vol. 63 | No 3 | 1087-1091 | DOI: 10.24425/123780
Słowa kluczowe welding steel ferrite impact toughness
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Abstrakt

Weld metal deposit (WMD) was carried out for standard MMA welding process. This welding method is still promising mainly due to the high amount of AF (acicular ferrite) and low amount of MAC (self-tempered martensite, retained austenite, carbide) phases in WMD. That structure corresponds with good impact toughness of welds at low temperature. Separate effect of these elements on the mechanical properties of welds is well known, but the combined effect of these alloy additions has not been analyzed so far. It was decided to check the total influence of nickel with a content between 1% to 3% and molybdenum with content from 0.1% up to 0.5%.

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Autorzy i Afiliacje

B. Szczucka-Lasota
T. Węgrzyn
A. Kurc-Lisiecka
J. Piwnik

Effect of Different Inoculants on Impact Toughness in High Chromium Cast Iron

D. Siekaniec D. Kopyciński E. Guzik E. Tyrała A. Nowak
Archives of Foundry Engineering | 2017 | vol. 17 | No 2 | DOI: 10.1515/afe-2017-0056
Słowa kluczowe mechanical properties High chromium cast iron Inoculation Impact toughness hardness
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Abstrakt

The present work, presented the study of effect of different inoculants on impact toughness in High Chromium Cast Iron. The molds were

pouring in industrial conditions and samples were tested in laboratory in Faculty of Foundry Engineering at AGH. Seven samples were tested

- one reference sample, three with different addition of Fe-Ti, and three with different addition of Al. The samples were subjected to impact

toughness on Charpy hammer and the hardness test. The presented investigations indicate that for the each inoculant there is an optimal

addition at which the sample obtained the highest value of impact toughness. For the Fe-Ti it is 0.66% and for Al is 0.17%. Of all the

examined inoculants best results were obtained at a dose of 0.66% Fe-Ti. Titanium is a well-known as a good modifier but very interesting

results gives the aluminum. Comparing the results obtained for the Fe-Ti and Al can be seen that in the case of aluminum hardness is more

stable. The hardness of all samples is around 40-45 HRC, which is not high for this type of cast iron. Therefore, in future studies it is

planned to carry out the heat treatment procedure that may improves hardness.

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Autorzy i Afiliacje

D. Siekaniec
D. Kopyciński
E. Guzik
E. Tyrała
A. Nowak

Micro-jet Cooling by Compressed Air after MAG Welding

Z. Stanik T. Węgrzyn W. Tarasiuk J. Piwnik M. Gabrylewski
Archives of Foundry Engineering | 2016 | No 2 | DOI: 10.1515/afe-2016-0036
Słowa kluczowe MAG Welding Micro-jet Acicular ferrite Impact toughness Compressed air
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Abstrakt

The material selected for this investigation was low alloy steel weld metal deposit (WMD) after MAG welding with micro-jet cooling. The

present investigation was aimed as the following tasks: analyze impact toughness of WMD in terms of micro-jet cooling parameters. Weld

metal deposit (WMD) was first time carried out for MAG welding with micro-jet cooling of compressed air and gas mixture of argon and

air. Until that moment only argon, helium and nitrogen and its gas mixture were tested for micro-jet cooling

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Autorzy i Afiliacje

Z. Stanik
T. Węgrzyn
W. Tarasiuk
J. Piwnik
M. Gabrylewski

MATHEMATHICAL EQUATIONS OF THE INFLUENCE OF MOLYBDENUM AND NITROGEN IN WELDS

Z. Stanik T. Węgrzyn J. Piwnik J. Kamińska
Archives of Metallurgy and Materials | 2018 | vol. 63 | No 1 | DOI: 10.24425/118912
Słowa kluczowe welding Steel micro-jet ferrite impact toughness equations
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Autorzy i Afiliacje

Z. Stanik
T. Węgrzyn
J. Piwnik
J. Kamińska

MICROSTRUCTURE AND IMPACT TOUGHNESS OF OFFSHORE STEEL

T.-C. Cheng C. Yu T.-C. Yang C.-Y. Huang H.-C. Lin R.-K. Shiue
Archives of Metallurgy and Materials | 2018 | vol. 63 | No 1 | DOI: 10.24425/118924
Słowa kluczowe low-temperature impact toughness prior austenite grain size hardenability bainite
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Autorzy i Afiliacje

T.-C. Cheng
C. Yu
T.-C. Yang
C.-Y. Huang
H.-C. Lin
R.-K. Shiue

Influence of Al, Cu and Ni Additions on Mechanical Properties of Hot-Rolled Fe-9Mn-0.2C Medium-Manganese Steels

Young-Chul Yoon Sang-Gyu Kim Sang-Hyeok Lee Byoungchul Hwang
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1007-1011 | DOI: 10.24425/amm.2021.136415
Słowa kluczowe medium-manganese steel hot-rolled microstructure strength impact toughness
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Abstrakt

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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Bibliografia

[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).
[7] M . Kuzmina, D. Ponge, D. Raabe, Acta Mater. 86, 182-192 (2015).
[8] H . Choi, S. Lee, J. Lee, F. Barlat, B.C.D. Cooman, Mater. Sci. Eng. A 687, 200-210 (2017).
[9] Z.H. Cai, H. Ding, R.D.K. Misra, H. Kong, H.Y. Wu, Mater. Sci. Eng. A 595, 86-91 (2014).
[10] Z.C. Li, H. Ding, Z.H. Cai, Mater. Sci. Eng. A 639, 559-566 (2015).
[11] T.W. Hong, S.I. Lee, J.H. Shim, J. Lee, M.G. Lee, B. Hwang, Korean J. Mater. Res. 28, 570-577 (2018).
[12] M .T. Kim, T.M. Park, K.H. Baik, W.S. Choi, P.P. Choi, J. Han, Acta. Mater. 164, 122-134 (2019).
[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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Autorzy i Afiliacje

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

Influence of Rare Earth Metals on Microstructure and Mechanical Properties of G20Mn5 Cast Steel

J. Kasińska
Archives of Foundry Engineering | 2018 | vol.18 | No 3 | 37-42
Słowa kluczowe G20Mn5 rare earth metals modification microstructure impact toughness
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Abstrakt

The paper describes influence of rare earth metals (REMs) on G20Mn5 cast steel microstructure and mechanical properties. The cerium mixture of the following composition was used to modify cast steel: 49.8% Ce, 21.8% La, 17.1% Nd, 5,5% Pr and 5.35% of REMs. Cast steel was melted in industrial conditions. Two melts of non-modified and modified cast steel were made. Test ingots were subject to heat treatment by hardening (920°C/water) and tempering (720°C/air). Heat treatment processes were also performed in industrial conditions. After cutting flashes off samples of cast steel were collected with purpose to analyze chemical composition, a tensile test and impact toughness tests were conducted and microstructure was subject to observations. Modification with use of mischmetal did not cause significant changes in cast steel tensile strength and yield strength, while higher values were detected for fractures in the Charpy impact test, as they were twice as high as values for the data included in the PN-EN 10213:2008 standard. Observations performed by means of light and scanning microscopy proved occurrence of significant differences in grain dimensions and morphology of non-metallic inclusions. Adding REMs resulted in grain fragmentation and transformed inclusion shapes to rounded ones. Chemical composition analyses indicated that round inclusions in modified cast steel were generally oxysulphides containing cerium and lanthanum. In the paper the author proved positive influence of modification on G20Mn5 cast steel mechanical properties.
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Autorzy i Afiliacje

J. Kasińska

Effect of Post-Heat Treatment on the Impact Toughness and Crack Propagation Mechanism of AISI D2 Tool Steel Manufactured by Direct Energy Deposition

Jung-Hyun Park Kyu-Sik Kim Yong-Mo Koo Jin-Young Kim Min-Chul Kim Kee-Ahn Lee
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 1 | 119-122 | DOI: 10.24425/amm.2023.141483
Słowa kluczowe AISI D2 tool steel Direct Energy Deposition Post-heat treatment impact toughness Fractograpy
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Abstrakt

This study investigated the effect of heat treatment on the microstructure and impact toughness property of AISI D2 manufactured with direct energy deposition (DED) and compared the results with conventional wrought material. The fracture crack propagation behavior was examined in connection with microstructures through fracture surface analysis. AISI D2 manufactured with DED had a eutectic structure that turned into a net-type carbide after heat treatment, and Cr-rich needle-type secondary carbide was observed. Impact toughness of DED AISI D2 measured 2.0 J/cm2 in the as-built sample and 1.1 J/cm2 in the heat-treated sample. Compared to a wrought heat-treated AISI D2, DED AISI D2 had relatively low impact toughness. DED AISI D2 and wrought material had different crack propagation mechanisms. In DED AISI D2, the eutectic structure and net-type carbide boundary were identified as the major microstructural factor decreasing impact toughness.
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Autorzy i Afiliacje

Jung-Hyun Park
1
ORCID: ORCID
Kyu-Sik Kim
1
ORCID: ORCID
Yong-Mo Koo
2
ORCID: ORCID
Jin-Young Kim
3
ORCID: ORCID
Min-Chul Kim
4
Kee-Ahn Lee
1
ORCID: ORCID
  1. Inha University, Department of Materials Science and Engineering, Incheon 22212, Korea
  2. Changsung Corp., Incheon, 21628, Korea
  3. Maxrotech Corp., Daegu, 42703, Korea
  4. Korea Atomic Energy Research Institute (KAERI), Daejeon 34057, Korea

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