Edge Microstructure and Strength Gradient in Thermally Cut Ti-Alloyed Martensitic Steels
Recently developed Ti-alloyed martensitic steels are believed to exhibit higher wear resistance than traditionally quenched and tempered medium carbon steels. However, their properties may deteriorate during thermal cutting and welding as a result of microstructure tempering. This would present sign...
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MDPI AG
2021-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/7/1138 |
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| author | Andrii G. Kostryzhev Muhammad Rizwan Chris R. Killmore Dake Yu Huijun Li |
| author_facet | Andrii G. Kostryzhev Muhammad Rizwan Chris R. Killmore Dake Yu Huijun Li |
| author_sort | Andrii G. Kostryzhev |
| collection | DOAJ |
| description | Recently developed Ti-alloyed martensitic steels are believed to exhibit higher wear resistance than traditionally quenched and tempered medium carbon steels. However, their properties may deteriorate during thermal cutting and welding as a result of microstructure tempering. This would present significant challenges for the metal fabrication industries. A decrease in strength and wear resistance associated with tempering should vary with steel composition, initial steel microstructure and properties, and cutting method. In this work, we investigated the effect of thermal cutting on the edge microstructure and properties in two alloyed plate steels containing 0.27C-0.40Ti and 0.39C-0.60Ti (wt.%) commercially rolled to 12 mm thickness. Three cutting methods were applied to each of the two plates: oxy-fuel, plasma and water-jet. Microstructure characterisation was carried out using optical and scanning electron microscopy. With an increase in thermal effect, from water-jet to plasma to oxy-fuel, the heat affected zone width increased and hardness decreased in both steels. However, the hardness profile from the cut edge to the base metal significantly varied with steel composition, particularly C and Ti contents. The dependence of grain structure and precipitation kinetics on steel composition, and cutting method, were thoroughly investigated and linked to the hardness profile variation. The obtained results will be used to optimise the technological parameters for cutting and welding of Ti-alloyed martensitic steels. |
| first_indexed | 2024-03-10T09:32:44Z |
| format | Article |
| id | doaj.art-bf1434e87d3e419e820417696df89f43 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T09:32:44Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-bf1434e87d3e419e820417696df89f432023-11-22T04:24:23ZengMDPI AGMetals2075-47012021-07-01117113810.3390/met11071138Edge Microstructure and Strength Gradient in Thermally Cut Ti-Alloyed Martensitic SteelsAndrii G. Kostryzhev0Muhammad Rizwan1Chris R. Killmore2Dake Yu3Huijun Li4ARC Research Hub for Australian Steel Manufacturing, University of Wollongong, Wollongong, NSW 2522, AustraliaARC Research Hub for Australian Steel Manufacturing, University of Wollongong, Wollongong, NSW 2522, AustraliaBlueScope Steel Limited, Five Islands Rd., Port Kembla, NSW 2505, AustraliaBisalloy Steels, 18 Resolution Drive, Unanderra, NSW 2526, AustraliaSchool of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, AustraliaRecently developed Ti-alloyed martensitic steels are believed to exhibit higher wear resistance than traditionally quenched and tempered medium carbon steels. However, their properties may deteriorate during thermal cutting and welding as a result of microstructure tempering. This would present significant challenges for the metal fabrication industries. A decrease in strength and wear resistance associated with tempering should vary with steel composition, initial steel microstructure and properties, and cutting method. In this work, we investigated the effect of thermal cutting on the edge microstructure and properties in two alloyed plate steels containing 0.27C-0.40Ti and 0.39C-0.60Ti (wt.%) commercially rolled to 12 mm thickness. Three cutting methods were applied to each of the two plates: oxy-fuel, plasma and water-jet. Microstructure characterisation was carried out using optical and scanning electron microscopy. With an increase in thermal effect, from water-jet to plasma to oxy-fuel, the heat affected zone width increased and hardness decreased in both steels. However, the hardness profile from the cut edge to the base metal significantly varied with steel composition, particularly C and Ti contents. The dependence of grain structure and precipitation kinetics on steel composition, and cutting method, were thoroughly investigated and linked to the hardness profile variation. The obtained results will be used to optimise the technological parameters for cutting and welding of Ti-alloyed martensitic steels.https://www.mdpi.com/2075-4701/11/7/1138martensitic steelcarbide precipitationmicrostructure characterisationmechanical propertiesthermal cutting |
| spellingShingle | Andrii G. Kostryzhev Muhammad Rizwan Chris R. Killmore Dake Yu Huijun Li Edge Microstructure and Strength Gradient in Thermally Cut Ti-Alloyed Martensitic Steels Metals martensitic steel carbide precipitation microstructure characterisation mechanical properties thermal cutting |
| title | Edge Microstructure and Strength Gradient in Thermally Cut Ti-Alloyed Martensitic Steels |
| title_full | Edge Microstructure and Strength Gradient in Thermally Cut Ti-Alloyed Martensitic Steels |
| title_fullStr | Edge Microstructure and Strength Gradient in Thermally Cut Ti-Alloyed Martensitic Steels |
| title_full_unstemmed | Edge Microstructure and Strength Gradient in Thermally Cut Ti-Alloyed Martensitic Steels |
| title_short | Edge Microstructure and Strength Gradient in Thermally Cut Ti-Alloyed Martensitic Steels |
| title_sort | edge microstructure and strength gradient in thermally cut ti alloyed martensitic steels |
| topic | martensitic steel carbide precipitation microstructure characterisation mechanical properties thermal cutting |
| url | https://www.mdpi.com/2075-4701/11/7/1138 |
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