Effect of Ce-La on inclusion evolution in Al-killed high strength steel

2020 ◽  
Vol 117 (6) ◽  
pp. 616
Author(s):  
Ruming Geng ◽  
Jing Li ◽  
Chengbin Shi ◽  
Jianguo Zhi ◽  
Bin Lu
Keyword(s):  
Rare Earth ◽  
Dissolved Oxygen ◽  
Molten Steel ◽  
High Strength Steel ◽  
High Strength ◽  
Thermodynamic Calculations ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Rare Earth Addition ◽  
La Addition

The mechanism of inclusion evolution after rare earth addition based on oxide metallurgy was investigated experimentally and using thermodynamic calculations, where Ce-La was added to Al-killed high strength steel during Ruhrstahl-Heraeus refining to modify the oxide inclusions within the steel. The typical inclusions observed before Ce-La addition were spherical magnesium aluminate spinel inclusions. And fewer individual Al2O3 inclusions and Al2O3–TiOx inclusions were also observed. The addition of Ce-La led to transformation of MgO · Al2O3 spinel inclusions to (Ce,La)2O3, (Ce,La)2O2S and (Ce,La)2O2S + MgO · Al2O3 inclusions. Thermodynamic calculations indicated that Ce-La combined with dissolved oxygen and sulfur in molten steel to form rare earth inclusions, while the remainder of the Ce and La modified MgO · Al2O3 to (Ce,La)2O3 and (Ce,La)2O2S.

Microstructure and Mechanical Properties of Low Alloy Ultra-High Strength Steel Microalloyed with Cerium

2021 ◽  
Vol 871 ◽  
pp. 53-58
Author(s):  
Yue Yue Jiang ◽  
Zhao Dong Wang ◽  
Xiang Tao Deng ◽  
R.D.K. Misra
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Impact Energy ◽  
High Strength Steel ◽  
Earth Element ◽  
High Strength ◽  
Matrix Composition ◽  
Microstructure And Mechanical Properties ◽  
Ultra High Strength Steel

This study aims to investigate the influences of rare earth element cerium (Ce) on microstructure and mechanical properties of low alloy ultra-high strength steel. The strength, plasticity, and impact toughness of steels with 0.0367% Ce and without Ce were tested. The influence mechanism of Ce on the microstructure and mechanical properties were investigated by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and electron back scattered diffraction (EBSD). The results showed that the addition of Ce improved the comprehensive mechanical properties of low alloy ultra-high strength steel. In particular, the plasticity and toughness were improved obviously. The addition of Ce increased the elongation from 9.47% to 10.49%, and the low-temperature impact energy from 50J to 58J. The elongation and impact energy increased by 10.77% and 16%, respectively. And the yield strength of all samples remained above 1400 MPa. The rare earth element Ce did not change the matrix composition phase which were martensite. However, the addition of Ce increased the proportion of high-angle grain boundary from 33.2% to 40.2%. In addition, the Ce make the inclusions denatured and hence spherical inclusion with small size can be obtained. The EDS results showed that rare earth and harmful elements P and O formed inclusions, which as a purifier for the molten steel and hindered the formation of the large-size composite inclusions.

Role of different rare earth oxides on the reaction sintering of magnesium aluminate spinel

2019 ◽  
Vol 45 (9) ◽  
pp. 11413-11420 ◽  
Author(s):  
Somnath Sinhamahapatra ◽  
Kausik Dana ◽  
Sunanda Mukhopadhyay ◽  
Himansu Sekhar Tripathi
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxides ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Reaction Sintering

scholarly journals Improvement in Microstructure and Toughness of Large Heat-input Weld Bond of High Strength Steel Due to Addition of Rare Earth Metals and Boron

1977 ◽  
Vol 17 (7) ◽  
pp. 419-427 ◽  
Author(s):  
Tokushi FUNAKOSHI ◽  
Tomoo TANAKA ◽  
Syuzo UEDA ◽  
Masaaki ISHIKAWA ◽  
Noriaki KOSHIZUKA ◽  
...  
Keyword(s):  
Rare Earth ◽  
Heat Input ◽  
High Strength Steel ◽  
Rare Earth Metals ◽  
High Strength ◽  
Large Heat

Effects of Mg, Si and Multiple Rare Earth Addition on Microstructures of Al3Ti /A356 Composites

2012 ◽  
Vol 557-559 ◽  
pp. 244-248
Author(s):  
Jian Hua Bi ◽  
Yu Tao Zhao ◽  
Zhi Hong Jia ◽  
Song Li Zhang ◽  
Gang Chen
Keyword(s):  
Rare Earth ◽  
Radial Growth ◽  
Solidification Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rare Earth Addition ◽  
La Addition ◽  
Size And Morphology ◽  
Preparation Techniques

In-situ Al3Ti /A356 composites were synthesized by direct melt reaction method in Al-K2TiF6 system. The preparation techniques was discussed and the effects of Si, Mg, La (0.30%), Ce (0.30%) and multiple rare earth (0.15% La + 0.15%Ce) addition on microstructures of Al3Ti /A356 composites were investigated by X-ray diffraction and scanning electron microscope. The results show that the morphology and size of Al3Ti reinforcement are influenced significantly by Si, Mg and the optimal preparation process is composition with latter Si, Mg alloying. The Al3Ti precipitations during solidification process are restrained by 0.30% La addition or 0.30% Ce addition and lead in the uniform of Al3Ti size and morphology. The radial growth of Al3Ti is strongly restrained by rare earth composite addition, and the main morphology is slender-spherical like.

scholarly journals High-strength steel S960QC welded with rare earth nanoparticle coated filler wire

2018 ◽  
Vol 102 (1-4) ◽  
pp. 105-119 ◽  
Author(s):  
Cyril Vimalraj ◽  
Paul Kah ◽  
Pavel Layus ◽  
Eric Mvola Belinga ◽  
Sergey Parshin
Keyword(s):  
Rare Earth ◽  
High Strength Steel ◽  
High Strength ◽  
Filler Wire
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