Microstructure Refinement for Fe-34Mn-10Al-0.76C Alloy Using Variable Pulsing Magnetic Field (PMF) Solidification

E. Almeshaiei, Lubanah Ahmad, Ibrahim Elgarhi
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Abstract

Background: The effect of the pulsed electromagnetic fields with different fluxes (voltages) on the microstructure of an alloy during all stages of solidification under specified thermal conditions will be discussed in this project. Experiments were carried out in the university laboratory for this purpose. The optical scanning, electron microscopy scanning, and dispersed X-ray analysis methods were used to analyze the results of the micro-solidification formulations of the alloy with different fluxes. To perform the required evaluation, a control sample was tested without any treatment, then the results of every flux were compared with the results of this control sample. The applied magnetics flux and Lorentz forces were considered as the main reasons for the achieved grain refining and diffusion of the improved solubility in the sample. The fully equiaxed dendritic structure has been realized for the aluminum alloys at 180 Volts flux. Lorentz's strong force, induced by the magnetic field, deactivates the developing direction of the bifurcation (dendrites), as well as spoils the directions of growing the intermetallic alloy, as a result of the formation of solid microstructures. Further refinements were achieved, by increasing the voltages. Therefore, it can be concluded that the pulsed electromagnetic field is a promising technique that can be utilized in the metallurgy evolution. The effect of PMF with different fluxes on the microstructure of the Fe-34Mn-10Al-0.76C alloy samples will be examined experimentally using optical scanning, EDX and SEM and by applying various analysis techniques. Then, compared with the control sample that don’t treated with any PMF. The initial dendrites growth direction and size were changed according to the PMF flux. Also, the lengths of the initial dendrites were reduced by increasing the voltage, which led to the formation of different dendrite equiaxed grains. The PMF flux affects the initial dendrites growth direction and size. While, increasing the PMF voltage reduces the lengths of the initial dendrites. Moreover, the PMF has a great impact on diffusion of solute through solidification that then influences the formation of eutectic microstructural.
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可变脉冲磁场(PMF)凝固Fe-34Mn-10Al-0.76C合金的组织细化
背景:本课题将研究不同通量(电压)脉冲电磁场对合金在特定热条件下凝固各阶段组织的影响。为此目的,在大学实验室里进行了实验。采用光学扫描、电镜扫描和分散x射线分析等方法对不同熔剂的合金微凝固配方进行了分析。为了进行所需的评估,在不进行任何处理的情况下对对照样品进行测试,然后将每种通量的结果与该对照样品的结果进行比较。外加磁通量和洛伦兹力是晶粒细化和溶解度扩散的主要原因。在180伏磁通下,铝合金实现了完全等轴的枝晶结构。由磁场诱导的洛伦兹强作用力使分岔(枝晶)的发展方向失活,同时破坏了金属间合金的生长方向,从而形成固体显微组织。进一步的改进是通过增加电压来实现的。因此,脉冲电磁场是一种很有前途的冶金演化技术。采用光学扫描、EDX和SEM等多种分析技术,研究不同熔点PMF对Fe-34Mn-10Al-0.76C合金试样显微组织的影响。然后,与未使用任何PMF处理的对照样品进行比较。初始枝晶的生长方向和大小随PMF通量的变化而变化。电压的升高使初始枝晶的长度减小,从而形成不同的枝晶等轴晶。PMF通量影响初始枝晶的生长方向和尺寸。增加PMF电压会减小初始枝晶的长度。此外,PMF对溶质在凝固过程中的扩散有很大影响,进而影响共晶组织的形成。
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