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Microstructure Characterization and Tensile Properties of a Ti-bearing Oxide Dispersion Strengthened Steel |
XIE Rui1,2( ), LV Zheng2, XU Changwei1, WANG Qing1, LIU Chunming2 |
1.School of Materials Science and Technology, Shenyang Jianzhu University, Shenyang 110168, China 2.School of Materials Science and Engineering, Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China |
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Cite this article:
XIE Rui, LV Zheng, XU Changwei, WANG Qing, LIU Chunming. Microstructure Characterization and Tensile Properties of a Ti-bearing Oxide Dispersion Strengthened Steel. Chinese Journal of Materials Research, 2022, 36(2): 99-106.
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Abstract An oxide dispersion strengthened (ODS) steel containing Ti was prepared by powder metallurgy. The grain morphology of the ODS steel was investigated by electron backscatter diffraction (EBSD). The morphology and types of precipitates in the ODS steel were characterized by transmission electron microscope (TEM) and high-resolution transmission electron microscope (HRTEM). The nano size precipitates of the ODS steel was investigated by small angle X-ray scattering (SAXS) technique and X-ray absorption fine structure (XAFS) technique using synchrotron radiation device. And the existence form of Y element in the ODS steel was examined by using XAFS technique. At the same time, the mechanical properties of the ODS steel were measured. The results show that the grains of the ODS steel are equiaxed, and the average grain size is 1.24×10-6 m. The spatial density of the nano-sized precipitates rich in O, Ti and Y of the steel is 1.39×10-24/m3, while the formed Y2Ti2O7 phase presents pyrochlore structure and a small amount of a phase rich in Cr and Mn was observed too. The tensile strength of the ODS steel reaches 1324 MPa at room temperature. With the increase of test temperature, the tensile strength of the material decreases, whereas the elongation increases gradually for the ODS steel.
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Received: 19 November 2020
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Fund: the Natural Science Foundation Young Scientist Foundation of China(51601031);Liao Ning Revitalization Talents Program(XLYC1902103) |
About author: XIE Rui, Tel: (024)24690310, E-mail: xierui198479@126.com
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