镁铝尖晶石固溶体成分对TiN析出行为的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.08.024

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Abstract Through the experiment of slag/steel reaction equilibrium on 2205 duplex stainless steel, inclusions in MgO-Al₂O₃ binary solid solution were obtained with different slag compositions. When the reaction reached the equilibrium, the new complex inclusion of MgO-Al₂O₃ solid solution combined with TiN would further form if adding 0.05% Ti to the steel. After water quenching, the inclusions were analyzed by SEM, and samples were electrolyzed by oxalic acid with content of 10%. And then grain morphology and size of δ ferrite was compared to that of as-cast microstructure without Ti. The experiment results showed that the precipitation quantity increased with the increase of Al₂O₃ proportion in MgO-Al₂O₃ solid solution while the grain of as-cast δ ferrite was obviously refined. It was found that TiN precipitated rarely out of MgO-rich MgO-Al₂O₃ solid solution and MgO-Al₂O₃, and the grain refining effect of δ ferrite was not obvious. By thermodynamic calculation, heterogeneous nucleation theory and experimental result analysis, it was concluded that inclusion composition of MgO-Al₂O₃ binary solid solution was jointly determined by slag composition and activity of Mg and Al. The increase of Al₂O₃ content in MgO-Al₂O₃ solid solution contributed to the lattice distortion of MgO-Al₂O₃, which is closely associated with vacancy in the lattice. Because of the enrichment of vacancies, lattice constant e was uneven. And vacancies had changed the crystal field and caused the movement or transfer of O^2-, which led to omission solid solution of spinel. It was the energy state changes of lattice that promoted the precipitation of Ti and N atoms on the surface of MgO-Al₂O₃ inclusion.

Key words： duplex stainless steel Mg-Al spinel solid solution TiN

Published: 25 April 2017 Online: 2018-05-02

CLC number:

TF764⁺.1

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	Articles by authors
	PANG Zongxu
	ZHU Rong
	CHEN Peidun
	WANG Junhai

Cite this article:

PANG Zongxu,ZHU Rong,CHEN Peidun, et al. Effect of Mg-Al Spinel Solid Solution Composition on Precipitation Behavior of TiN[J]. Materials Reports, 2017, 31(8): 118-124.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.08.024 OR https://www.mater-rep.com/EN/Y2017/V31/I8/118

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