Effect of Rare Earth Metals on the Microstructure and Impact Toughness of a Cast 0.4C-5Cr-1.2Mo-1.0V Steel.

Lan, Jie; He, Junjie; Ding, Wei; Wang, Qudong; Zhu, Yue

doi:10.2355/isijinternational.40.1275

Cited by 63 publications

(38 citation statements)

References 5 publications

(6 reference statements)

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“…[12][13][14] It is well known that the appropriate addition of rare earth elements is conducive to improving the performance of steels. [15][16][17] Some researchers [18,19] have investigated that rare earth elements can effectively transform hard oxides and elongated sulfides into low-hardness rare earth oxides or rare earth oxy-sulfides. Some researchers [20][21][22] have carried out studies on the modification of MgO Á Al 2 O 3 inclusion by rare earth elements in laboratory experiments.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cerium on the Behavior of Inclusions in H13 Steel

Huang

Cheng

et al. 2018

steel research int.

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The modification mechanism of cerium (Ce) on oxides and multilayer carbontrides in H13 steel is investigated by industrial trials and thermodynamic calculations. The morphology, composition, and size of inclusions are analyzed by scanning electron microscopy and energy dispersive spectroscopy. The main inclusions in H13 steel without Ce content in the molten steel are MgAl2O4 spinel inclusions and multilayer carbonitrides. The carbonitrides have a multilayer structure in which MgAl2O4 acts as the nucleation core and the second layer is (Ti, V)(C, N). As the cerium content in molten steel increases from 0 to 0.03 wt%, the MgAl2O4 is effectively modified into cerium oxide (Ce–O) and cerium oxy‐sulfide (Ce–O–S), and the evolutionary process is as follows: MgAl2O4 → CeAlO3 → Ce–O and Ce–O–S. Likewise, the structure of multilayer carbonitrides in the H13 steel also changed. The MgAl2O4 and CeAlO3 act as heterogeneous nucleation cores of multilayer carbonitrides. However, Ce–O and Ce–O–S can effectively inhibit the heterogeneous nucleation of carbonitrides. The number density of large‐size carbontrides is remarkably reduced with increasing Ce content. A prediction model of optimum Ce content in molten steel is built, which has remarkable agreement with the experimental observations.

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Section: Introductionmentioning

confidence: 99%

Effect of Cerium on the Behavior of Inclusions in H13 Steel

Huang

Cheng

et al. 2018

steel research int.

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“…The boundary energy between the heterogeneous nuclei and the crystallization phase has an effect on nucleus formation and it depends on the structure of the two contacting crystalline faces (arrangement condition, atom size and interatomic spacing of the crystal faces) [28]. The value of the two-dimensional lattice misfits usually evaluated where some inclusions may act as the heterogeneous nuclei.…”

Section: Interfacementioning

confidence: 99%

“…It has been reported that REM addition can refine the grain refinement because the RE oxide inclusions can act as the heterogeneous nuclei. These inclusions must have two conditions to become effective heterogeneous nuclei [27][28][29].…”

Section: The Analysis Of Grain Refinementmentioning

confidence: 99%

Effects of Rare Earth on the Microstructure and Impact Toughness of H13 Steel

Gao

Liu

et al. 2015

Metals

106

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Studies of H13 steel suggest that under appropriate conditions, additions of rare-earth metals (REM) can significantly enhance mechanical properties, such as impact toughness. This improvement is apparently due to the formation of finer and more dispersive RE inclusions and grain refinement after REM additions. In this present work, the microstructure evolution and mechanical properties of H13 steel with rare earth additions (0, 0.015, 0.025 and 0.1 wt.%) were investigated. The grain size, inclusions and fracture morphology were systematically studied by means of optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicate that REM addition of 0.015 wt.% can result in good improvement of performance compared to the REM additions of 0.025 wt.% and 0.1 wt.%. It is found that the impact toughness is significantly enhanced with the addition of 0.015% REM, which can be improved 90% from 10 J to 19 J. Such an addition of REM can result in a huge volume fraction of finer and more dispersive inclusions which are extremely good to toughness.

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“…Moreover, the additive RE has decontaminated the interface of the grains by eliminating the harmful elements concentrated in it. Therefore, the brittleness of the grain boundaries of the alloy has been decreased, and cracks hardly propagate along interfaces [26,27]. They propagate mostly by the cleavage fracture of the grain, so the toughness of the modified cast Fe-V-W-Mo alloy greatly increases.…”

Section: Influence Of Modification On Mechanical Properties Of Fe-v-wmentioning

confidence: 98%

A study of the microstructures and properties of Fe–V–W–Mo alloy modified by rare earth

Xiao

2005

Materials Science and Engineering: A

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Effect of Rare Earth Metals on the Microstructure and Impact Toughness of a Cast 0.4C-5Cr-1.2Mo-1.0V Steel.

Cited by 63 publications

References 5 publications

Effect of Cerium on the Behavior of Inclusions in H13 Steel

Effect of Cerium on the Behavior of Inclusions in H13 Steel

Effects of Rare Earth on the Microstructure and Impact Toughness of H13 Steel

A study of the microstructures and properties of Fe–V–W–Mo alloy modified by rare earth

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