Optical Strain Measurement and Microfractography of the Fractures of Armstal 550 Steel after Temperature Tensile Tests
A material strength investigation along with a detailed microfractography analysis of fractures formed during static tensile tests of steel Armstal 550 was performed. The tests in this research were conducted in a temperature range of 298 to 973 K. In addition, during tensile tests at ambient temper...
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MDPI AG
2022-12-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/24/8875 |
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| author | Paweł Bogusz Barbara Nasiłowska Grzegorz Sławiński |
| author_facet | Paweł Bogusz Barbara Nasiłowska Grzegorz Sławiński |
| author_sort | Paweł Bogusz |
| collection | DOAJ |
| description | A material strength investigation along with a detailed microfractography analysis of fractures formed during static tensile tests of steel Armstal 550 was performed. The tests in this research were conducted in a temperature range of 298 to 973 K. In addition, during tensile tests at ambient temperature, optical measurements of strain maps and the curvature of the neck were performed. The minimum cross-sectional diameter and the radius of the neck curvature during tensile tests were obtained. The data can be directly used to obtain the true stress–strain curve. The material property analysis confirmed the high strength of the Armstal 550 alloy. The ultimate strength at room temperature equals 2.14 GPa, whereas the yield point equals 1.65 GPa. A decrease in the strength parameters along with an increase in temperature was noted. This is a typical phenomenon related to a change in the density and thermal expansion of steel under the influence of the temperature increase. For example, at a temperature of 500 °C, the ultimate strength is more than 50% less than at room temperature. An in-depth analysis of the metallography and microfractography of fractures resulting from static tensile tests showed the formation of atypical nano- and microstructures with an elongated shape. Local nano- and microstructures were observed at different levels of intensity for different temperatures. The largest clusters of nanoparticles were present on the surfaces of the specimens examined at a temperature of 973 K. Scanning microscopy analysis confirmed the presence of molybdenum oxides. |
| first_indexed | 2024-03-09T16:09:23Z |
| format | Article |
| id | doaj.art-c3105bf510954121b9cedd66f65ea725 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T16:09:23Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
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| spelling | doaj.art-c3105bf510954121b9cedd66f65ea7252023-11-24T16:23:10ZengMDPI AGMaterials1996-19442022-12-011524887510.3390/ma15248875Optical Strain Measurement and Microfractography of the Fractures of Armstal 550 Steel after Temperature Tensile TestsPaweł Bogusz0Barbara Nasiłowska1Grzegorz Sławiński2Faculty of Mechanical Engineering, Military University of Technology, Gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, Gen. S. Kaliskiego 2, 00-908 Warsaw, PolandFaculty of Mechanical Engineering, Military University of Technology, Gen. S. Kaliskiego 2, 00-908 Warsaw, PolandA material strength investigation along with a detailed microfractography analysis of fractures formed during static tensile tests of steel Armstal 550 was performed. The tests in this research were conducted in a temperature range of 298 to 973 K. In addition, during tensile tests at ambient temperature, optical measurements of strain maps and the curvature of the neck were performed. The minimum cross-sectional diameter and the radius of the neck curvature during tensile tests were obtained. The data can be directly used to obtain the true stress–strain curve. The material property analysis confirmed the high strength of the Armstal 550 alloy. The ultimate strength at room temperature equals 2.14 GPa, whereas the yield point equals 1.65 GPa. A decrease in the strength parameters along with an increase in temperature was noted. This is a typical phenomenon related to a change in the density and thermal expansion of steel under the influence of the temperature increase. For example, at a temperature of 500 °C, the ultimate strength is more than 50% less than at room temperature. An in-depth analysis of the metallography and microfractography of fractures resulting from static tensile tests showed the formation of atypical nano- and microstructures with an elongated shape. Local nano- and microstructures were observed at different levels of intensity for different temperatures. The largest clusters of nanoparticles were present on the surfaces of the specimens examined at a temperature of 973 K. Scanning microscopy analysis confirmed the presence of molybdenum oxides.https://www.mdpi.com/1996-1944/15/24/8875material strengthmicrofractographystatic tensile testarmour steelnanoparticlesoptical measurements |
| spellingShingle | Paweł Bogusz Barbara Nasiłowska Grzegorz Sławiński Optical Strain Measurement and Microfractography of the Fractures of Armstal 550 Steel after Temperature Tensile Tests Materials material strength microfractography static tensile test armour steel nanoparticles optical measurements |
| title | Optical Strain Measurement and Microfractography of the Fractures of Armstal 550 Steel after Temperature Tensile Tests |
| title_full | Optical Strain Measurement and Microfractography of the Fractures of Armstal 550 Steel after Temperature Tensile Tests |
| title_fullStr | Optical Strain Measurement and Microfractography of the Fractures of Armstal 550 Steel after Temperature Tensile Tests |
| title_full_unstemmed | Optical Strain Measurement and Microfractography of the Fractures of Armstal 550 Steel after Temperature Tensile Tests |
| title_short | Optical Strain Measurement and Microfractography of the Fractures of Armstal 550 Steel after Temperature Tensile Tests |
| title_sort | optical strain measurement and microfractography of the fractures of armstal 550 steel after temperature tensile tests |
| topic | material strength microfractography static tensile test armour steel nanoparticles optical measurements |
| url | https://www.mdpi.com/1996-1944/15/24/8875 |
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