A Study on the Microstructures and Toughness of Fe-B Cast Alloy Containing Rare Earth

Yi, Danhui; Zhang, Zhiyun; Fu, Hanguang; Yang, Chengyan; Ma, Shengqiang; Li, Yefei

doi:10.1007/s11665-014-1331-y

Cited by 20 publications

(3 citation statements)

References 12 publications

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“…In the past few decades, this model has been widely used. The grain refinement potency of the RE oxides, oxysulfides, and sulfides for δ-ferrite and/or γ-austenite primary phase during solidification of steels have been examined using the two-dimensional disregistry model [25,30,48,51,[67][68][69]. Pan et al [70] calculated the two-dimensional disregistry between the potential nucleants, Ce 2 O 3 and La 2 O 3 , and the primary phases (δ-ferrite and γ-austenite) at 1500 • C. The calculated δ values were: In terms of the Bramfitt's criteria [16], Ce 2 O 3 and La 2 O 3 could effectively promote heterogeneous nucleation of δ-ferrite, but not for γ-austenite.…”

Section: Lattice Disregistry Approachmentioning

confidence: 99%

Roles of Lanthanum and Cerium in Grain Refinement of Steels during Solidification

Zhang

Ren

2018

Metals

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Refinement of as-cast structures is one of the most effective approaches to improve mechanical properties, formability, and surface quality of steel castings and ingots. In the past few decades, addition of rare earths (REs), lanthanum and cerium in particular, has been considered as a practical and effective method to refine the as-cast steels. However, previous reports contained inconsistent, sometime even contradictory, results. This review summaries the major published results on investigation of the roles of lanthanum or/and cerium in various steels, provides reviews on the similarity and difference of previous studies, and clarifies the inconsistent results. The proposed mechanisms of grain refinement by the addition of lanthanum or/and cerium are also reviewed. It is concluded that the grain refinement of steels by RE additions is attributed to either heterogeneous nucleation on the in-situ formed RE inclusions, a solute effect, or the combined effect of both. The models/theories for evaluation of heterogeneous nucleation potency and for solute effect on grain refinement of cast metals are also briefly summarized.

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Section: Lattice Disregistry Approachmentioning

confidence: 99%

Roles of Lanthanum and Cerium in Grain Refinement of Steels during Solidification

Zhang

Ren

2018

Metals

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“…Alloying and high-temperature heat treatment are effective ways to improve the toughness of high boron steel. The Fe 2 B grains can be refined by Ti and Ni addition in the alloy and decomposition of net-like Fe 2 B is facilitated by Ce addition [ 15 , 16 ]. The distribution of boride is improved by modification of the alloy molten with V, Ti, and RE-Mg [ 17 ], which improves the toughness of a high boron iron-based alloy.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Quenching and Partitioning (Q&P) Heat Treatment on the Microstructure and Mechanical Properties of High Boron Steel

et al. 2021

Materials

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High boron steel is prone to brittle failure due to the boride distributed in it with net-like or fishbone morphology, which limit its applications. The Quenching and Partitioning (Q&P) heat treatment is a promising process to produce martensitic steel with excellent mechanical properties, especially high toughness by increasing the volume fraction of retained austensite (RA) in the martensitic matrix. In this work, the Q&P heat treatment is used to improve the inherent defect of insufficient toughness of high boron steel, and the effect mechanism of this process on microstructure transformation and the change of mechanical properties of the steel has also been investigated. The high boron steel as-casted is composed of martensite, retained austensite (RA) and eutectic borides. A proper quenching and partitioning heat treatment leads to a significant change of the microstructure and mechanical properties of the steel. The net-like and fishbone-like boride is partially broken and spheroidized. The volume fraction of RA increases from 10% in the as-cast condition to 19%, and its morphology also changes from blocky to film-like. Although the macro-hardness has slightly reduced, the toughness is significantly increased up to 7.5 J·cm−2, and the wear resistance is also improved.

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“…Modification treatment is a widely applied technology to refine the carbide in alloys [35][36][37][38][39][40][41]. According to the previous works, microstructure of high-speed steel can be changed by some kind of particular element so that the property of which can also be improved.…”

Section: Introductionmentioning

confidence: 99%

Effect of Titanium Modification on Microstructure and Impact Toughness of High-Boron Multi-Component Alloy

Ren

Tang

et al. 2021

Metals

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This work investigated the microstructure and mechanical property of high-boron multi-component alloy with Fe, B, C, Cr, Mo, Al, Si, V, Mn and different contents of Ti. The results indicate that the as-cast metallurgical microstructure of high-boron multi-component alloys consist of ferrite, pearlite and borocarbide. In an un-modified alloy, continuous reticular structure of borocarbide is observed. After titanium addition, the structure of borocarbide changes into a fine and isolated morphology. TiC is the existence form of titanium in the alloy, which acts as the heterogeneous nuclei for eutectic borocarbide. Moreover, impact toughness of the alloy is remarkably improved by titanium modification.

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A Study on the Microstructures and Toughness of Fe-B Cast Alloy Containing Rare Earth

Cited by 20 publications

References 12 publications

Roles of Lanthanum and Cerium in Grain Refinement of Steels during Solidification

Roles of Lanthanum and Cerium in Grain Refinement of Steels during Solidification

The Effect of Quenching and Partitioning (Q&P) Heat Treatment on the Microstructure and Mechanical Properties of High Boron Steel

Effect of Titanium Modification on Microstructure and Impact Toughness of High-Boron Multi-Component Alloy

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