钛元素对9Cr氧化物弥散强化钢微观组织和拉伸性能的影响

doi:10.11896/cldb.19070161

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Abstract In this paper 9Cr oxide dispersion strengthened (ODS) steels were studied. 9Cr-ODS steels with Ti element and Ti-free were manufactured by hot isostatic pressing (HIP) method. After HIP the microstructures and tensile properties of 9Cr-ODS steels were observed and mea-sured. The effects of Ti element on the oxides in ODS steels were studied by transmission electron microscope (TEM), X-ray absorption fine structure (XAFS) and small-angle X-ray scattering (SAXS) technologies. The effect of Ti element on tensile properties of 9Cr-ODS steels was also measured. The experimental results show that the grain size of 9Cr-ODS steel sample is refined after Ti element added. The mean grain size of 9Cr-ODS steel with Ti element is 1.2 μm. After adding Ti element, the types of oxide are changed, Y₂Ti₂O₇ phase and Y-Ti-O cluster are tend to form in the ODS steels. The particle size of oxides phase decreases, but the distribution density increases, after Ti element added. The tensile strength of 9Cr-ODS steel sample is increased after adding Ti element. The tensile strength at room temperature reaches to 1 324 MPa. The main strengthening mechanism is dispersion strengthening in ODS steel. The tensile strengths of the samples decrease as the test temperature increased.

Key words： oxide dispersion strengthened steels Ti element X-ray absorption fine structure small-angle X-ray scattering microstructure tensile properties

Published: 02 December 2020

CLC number:

TB31

Fund:This work was financially supported by the Natural Science Foundation Young Scientist Foundation of China (51601031).

About author:: Rui Xiereceived his B.E. degree in materials engineering from the Shenyang Jianzhu University of China and Ph.D. degree in materials science from the Nort-heastern University of China in Sep. 2010—Jul. 2015. He worked at metallurgy engineering post-doctoral research station since Oct. 2015 to Mar. 2018. He worked at Shenyang Jianzhu University from Jul. 2018 as a lecturer. He has published more than 15 journal papers and two national patent authorizations. His research interests focus on the advanced metals with national research priority, and the nuclear reactor plant structure metals materials. In addition, his reach area acquired support of Natural Science Foundation Young Scientist Foundation of China, subtopics of National Key R&D Projects and Science Foundation of Liaoning Province.

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	XIE Rui
	LYU Zheng
	XU Changwei
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Cite this article:

XIE Rui,LYU Zheng,XU Changwei, et al. Effect of Ti Element on the Microstructures and Tensile Properties of 9Cr Oxides Dispersion Strengthened Steels[J]. Materials Reports, 2020, 34(22): 22111-22117.

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http://www.mater-rep.com/EN/10.11896/cldb.19070161 OR http://www.mater-rep.com/EN/Y2020/V34/I22/22111

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