Materials Reports  2021, Vol. 35 Issue (Z1): 381-385 |
| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Temper Treatment on the Surface Structure and the Compressive Mechanical Properties of a New Cobalt-based Alloy |
| WEN Junxia1,2,3, YU lei1,2, CAO Rui1,2, CHE Hongyan4, WANG Tiejun4, DONG Hao4, YAN Yingjie1,2
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1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou 730050, China
2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
3 School of Mechanical and Electrical Engineering, Liuzhou Vocational & Technical College, Liuzhou 545005, China
4 Advanced Technology & Materials Limited Company, Beijing 100081, China |
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Abstract In this paper, the compressive properties and the fracture process of a cobalt-based alloy before and after tempering were analyzed and explained. The compression stress-strain curves before and after tempering were analyzed. The microstructures of the cobalt-based alloy were investigated by using X-ray diffractometer (XRD) and scanning electron microscope (SEM). The fracture process of the compressed samples before and after tempering treatment is very different. The fracture process of the compressed samples without tempering treatment is a typical brittle fracture, exhibiting an angle between fracture surface and compression axis direction of 45°. After tempered treatment, the crack was firstly generated at the surface of the compressed sample. The cracking direction was parallel to the compression direction. At the same time, there was a 45° conical fracture surface formed on the top of the sample, and then the sample fractured under compression. The core-shell structure formed by oxidation during tempering is responsible for the change of the compressive fracture behavior of this cobalt-based alloy. However, the microstructure of the material itself played a dominant role in the whole compression process. After tempering, the content of fcc-Co phase in the Co matrix obviously increased and the sharp angle of Cr23C6 particles disappeared and became smooth, which improved the toughness of the cobalt-base alloy.
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Published: 16 July 2021
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| Fund:financilly National Natural Science Foundation of China (51761027, 51675255). |
| About author:: Junxia Wen, received her Ph.D. degree in materials science and engineering from the University of Lanzhou University of Technology in Sep. 2016—Dec. 2020. She was appointed to the faculty of Liuzhou Vocational & Technical College since Jul. 2011. She has published 3 journal papers as the first author. Her research interests focus on the fatigue & oxidation behavior of metal materials, and the surface modification of metal materials. Rui Cao, Doctor of Engineering, professor, doctor supervisor in Lanzhou University of Technology. From July 2003 up to now, working at School of Materials Science and Engineering, Lanzhou University of Technology. Her research interests are weldability, strength and toughness, corrosion, deformation, damage and fracture behavior of new materials and dissimilar materials More than 70 papers published in English and 100 papers published in Chinese. |
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