Effect of trace Si on MgO·Al2O3 inclusion in ultra-low-carbon steel

Lei, Chong; Shang, Deli; Ai, Xingang; Jin, Pengliang; Xiao, Yuanyou; Wang, Guocheng; Liu, Chunwei

doi:10.1007/s42243-020-00529-3

“…This may be the reason that compared with TiS, TiN has a better nucleation ability with MgO and CaO to form Ti-Mg-Ca-O composite inclusions. [3,33] On the contrary, MnS and TiS have better lattice matching ability, thus forming TiS-MnS composite inclusions.…”

Section: Changes Of Inclusions' Mass Fraction In the Cooling And Soli...mentioning

confidence: 99%

“…

Recent years, in order to use the properties of appropriate inclusions with specified composition and fine size for reducing inclusion harm as well as refining steel microstructures, [1][2][3][4][5] many researches have paid attention to technologies and mechanisms of complex deoxidization and inclusion treatments using Al, Ti, and Mg. [5][6][7][8][9][10] Zheng et al [4] observed single Al 2 O 3 , MnS, and TiN inclusions in the Al-Ti complex deoxidized low-carbon steel and single MnS and TiO x -MnS complex inclusion in the Ti-killed low-carbon steel, respectively. They found that TiO x -MnS inclusion with 1-3 μm could induce nucleation of interlocking intragranular acicular ferrite (IAF), resulting in finer microstructure and better toughness of the heat-affected zone.

…”

mentioning

confidence: 99%

Effects of S Content on Inclusion Formation in the Al and Ti–Mg Complex Deoxidized Steel

Jin

¹

,

Yang

²

,

Lei

³

et al. 2023

steel research int.

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Recent years, in order to use the properties of appropriate inclusions with specified composition and fine size for reducing inclusion harm as well as refining steel microstructures, [1][2][3][4][5] many researches have paid attention to technologies and mechanisms of complex deoxidization and inclusion treatments using Al, Ti, and Mg. [5][6][7][8][9][10] Zheng et al. [4] observed single Al 2 O 3 , MnS, and TiN inclusions in the Al-Ti complex deoxidized low-carbon steel and single MnS and TiO x -MnS complex inclusion in the Ti-killed low-carbon steel, respectively. They found that TiO x -MnS inclusion with 1-3 μm could induce nucleation of interlocking intragranular acicular ferrite (IAF), resulting in finer microstructure and better toughness of the heat-affected zone. Wu et al. [5] observed the multilayer Al 2 O 3 -MgO-TiO x inclusion with surficial local MnS precipitates and Al 2 O 3 -MgO inclusion wrapped by MnS in the Al-Ti deoxidized and Mg-treated steel with different Al contents. They suggested that the local MnS precipitates on the surface of Al 2 O 3 -MgO-TiO x inclusion can improve the formation of interlocking AFs, and the number of AF is dependent on the numbers of Al 2 O 3 -MgO-TiO x -MnS.The inclusions are mainly composed of Al 2 O 3 , MgAl 2 O 4 , TiO x , TiN, MnS and their various multicomponent complexities in the Al, Ti, and Mg deoxidized and treated steels. Park et al. [6] found that inclusions belong to MgO-Ti 2 O 3 -TiO 2 -Al 2 O 3 þ MnS þ TiN system in the Al-Mn-Si-Ti-Mg complex deoxidized steel with different Al contents. Oxide evolution continuously changed from Mg-Ti-O to MgAl 2 O 4 with Al content and TiN precipitates on the surface of MnS. Chang et al. [7] observed that inclusions were composed of MgO-MnO-Ti 2 O 3 -TiO 2 , MnS, and TiN in the Mn-Si-Ti deoxidized and Mg-treated steel. With the increase of dissolved Mg content, phase changed in the order of the Ti

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