Low-temperature nanostructured bainite transformation: The effect of magnetic field

Dong, Baoqi; Hou, Tingping; Wu, Kaiming; You, Zhixiong; Li, Z.H.; Zhang, G.H.; Lin, Heng-Fu

doi:10.1016/j.matlet.2018.12.118

Cited by 16 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the TMF processing is added, the Gibbs free energy changes induced by the extra energy are introduced into the alloy melt. [ 37–39 ] Therefore, Equation () and () can be rewritten as

Δ G_{normalg} = τ \cdot S_{normalg} + V \cdot Δ G_{normalV} + V \cdot Δ G_{TMF}

R_{TMF} = - 2 τ / (Δ G_{normalV} + Δ G_{TMF})

where Δ G TMF is the magnetic free energy which increases with the strength of the magnetic fields, and R TMF is the critical nucleation radius in the presence of TMF. Clearly, the value of R TMF will be less than R c .…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural Optimization of Fe‐Rich Intermetallic in Al–12 wt% Si–2 wt% Fe alloys by Adding Travelling Magnetic Fields

Xia

Luo

et al. 2020

Adv Eng Mater

View full text Add to dashboard Cite

Iron can cause negative effects on the recycling and mechanical performance of Al–Si alloys, because it is difficult to remove, and easy to form Fe‐rich intermetallic with large size. In this regard, travelling magnetic fields are performed to optimize Fe‐rich intermetallic in Al–12 wt% Si–2 wt% Fe alloys; and experiments and simulations are conducted to study the related evolutions induced by different Fe content from 0.1 to 2 wt% and by travelling magnetic fields. Current findings conclude that the increase of Fe content changes the precipitation sequence, causing Fe‐rich intermetallic to preferentially form and convert from α‐Al8Fe2Si to β‐Al9Fe2Si2; accompanied by the increase of aspect ratio and max‐length from 1.81 and 15.0 μm ( wt% Fe) to 50.2 and 578.2 μm (2 wt% Fe) respectively, as well as the decrease of curvature from 0.079 μm−1 (0.1 wt% Fe) to 0.001 μm−1 (2 wt% Fe). Moreover, precipitates containing Cu shift from adhering to the (Al, Si) phases to Fe‐rich intermetallic. In additionally, primary Si particles and Al–Si eutectic phases decrease. Noteworthily, travelling magnetic fields can reduce nucleate radius and generate intense long‐range directional melt flows, further to distribute temperature and solute uniformly and break up Fe‐rich intermetallic, so as to optimize them. Consequently, max‐length and aspect ratio decrease by 43.7% and 44.6%, whereas curvature increases by 2.7 times.

show abstract

“…When the TMF processing is added, the Gibbs free energy changes induced by the extra energy are introduced into the alloy melt. [ 37–39 ] Therefore, Equation () and () can be rewritten as

Δ G_{normalg} = τ \cdot S_{normalg} + V \cdot Δ G_{normalV} + V \cdot Δ G_{TMF}

R_{TMF} = - 2 τ / (Δ G_{normalV} + Δ G_{TMF})

Section: Discussionmentioning

confidence: 99%

“…When the TMF processing is added, the Gibbs free energy changes induced by the extra energy are introduced into the alloy melt. [37][38][39] Therefore, Equation 2and (4) can be rewritten as…”

Section: Mechanisms Of Tmf On Evolution Of Fe-rich Intermetallicmentioning

confidence: 99%

Microstructural Optimization of Fe‐Rich Intermetallic in Al–12 wt% Si–2 wt% Fe alloys by Adding Travelling Magnetic Fields

Xia

Luo

et al. 2020

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…As a result, the microstructure of the ingot and weld joint is refined, and the strength and ductility are improved. The magnetic field can also be coupled with heat treatments for phase transformation, including austenite [3,4], martensite [5], and bainite [6] transformation. In addition, it can also reduce the retained austenite content and increase the carbide content during tempering [4].…”

Section: Introductionmentioning

confidence: 99%

Mechanism and application of mechanical property improvements in engineering materials by pulsed magnetic treatment: A review

Cai,

Qian,

Zhang

et al. 2024

Friction

View full text Add to dashboard Cite

Pulsed magnetic treatment (PMT) has been adopted as an effective strengthening method for engineering materials and components in recent years, and the development of its application depends on the comprehensive understanding of the nature of PMT. The deep mechanism was thought initially to be the magnetostrictive effect, while further investigation found that the magnetic field could lead to the change of the defect states in the crystal, which is called the magnetoplastic effect. Due to the complexity of the engineering materials, manifestations of the magnetoplastic effect become more diverse, and they were reviewed in the form of microstructure homogenization and interfacial stabilization. Further, the mechanism of the magnetoplastic effect was discussed, focusing on the changes in the spin states under the external magnetic field. Microstructure modifications could also alter material performances, especially the residual stress, plasticity, and fatigue properties. Therefore, PMT with specific parameters can be utilized to obtain an ideal combination of microstructure, residual stress, and mechanical properties for better service performance of different mechanical parts, and its applications on machining tools and bearings are perfect examples. This work reviews the effect of PMT on the microstructure and properties of different materials and the mechanism, and it also summarizes the fundamental applications of PMT on essential mechanical parts.

show abstract

“…HMF has been found to modify the phase transformation and the microstructures of steels. Due to the difference in magnetic properties of the parent and product phases in steels, the application of HMF has a significant impact on the thermodynamics and kinetics of the various phase transformations [13][14][15], such as martensite [16,17], bainite [18,19], austenite [20,21], ferrite [15,22], and pearlite [23,24] transformation. More recently, the tempering behaviors of steel in an HMF have drawn increasing attention [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Effect of High Magnetic Field in Combination with High-Temperature Tempering on Microstructures and Mechanical Properties of GCr15 Bearing Steel

Chen

Zhu

et al. 2022

Metals

View full text Add to dashboard Cite

The microstructures and mechanical properties of GCr15 bearing steel after high-temperature tempering with and without a 5 T high magnetic field (HMF) were investigated. It was found that the application of the HMF at the stage of high-temperature tempering slowed down the growth of the tempered sorbite (TS) structures, increased the density of the carbides, and reduced the carbide size and the volume fraction. XRD diffraction patterns showed that the HMF resulted in a higher dislocation density. Hardness testing indicated that the HMF led to an increase in the Vickers hardness in the tempered sample. It is inferred that the change in carbide size stems from the reduction in nucleation barrier in the HMF and the increase in dislocation density originates from the interaction between dislocations and carbides. Additionally, the decrease in diffusivity in the HMF also contributes to the reduction in the size of TS structures and the refinement of carbides. This work demonstrates that high-temperature tempering with an HMF can slow down the growth of TS microstructures in GCr15 bearing steel, control the carbide size, and improve Vickers hardness, which provides a new heat treatment method to regulate the microstructure and properties of GCr15 bearing steel.

show abstract

Low-temperature nanostructured bainite transformation: The effect of magnetic field

Cited by 16 publications

References 13 publications

Microstructural Optimization of Fe‐Rich Intermetallic in Al–12 wt% Si–2 wt% Fe alloys by Adding Travelling Magnetic Fields

Microstructural Optimization of Fe‐Rich Intermetallic in Al–12 wt% Si–2 wt% Fe alloys by Adding Travelling Magnetic Fields

Mechanism and application of mechanical property improvements in engineering materials by pulsed magnetic treatment: A review

Effect of High Magnetic Field in Combination with High-Temperature Tempering on Microstructures and Mechanical Properties of GCr15 Bearing Steel

Contact Info

Product

Resources

About