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Optimization of mechanical alloying parameters in 12YWT ferritic steel nanocomposite

机译：12YWT铁素体钢纳米复合材料机械合金化参数的优化

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摘要

The effects of different mechanical alloying parameters on the microstructural characteristics and morphology of ODS-ferritic steel nanocomposite powders were investigated. The steady state between the welding and fracturing of the particles was obtained within about 30 h using 8 mm ball diameter and 420 rpm milling speed with the ball-to-powder weight ratio of 10:1. However, for perfect dissolution of the used alloying elements, the mechanical alloying process must be continued up to 80 h of milling. Evaluation of the microstructural characteristics calculated by X-ray diffraction profile analysis revealed that although the average crystallite size reduced more sharply at the initial milling stages under the above conditions, with further milling, it eventually reached nearly the same value in all specimens. The distribution changes of crystallite size also showed a similar behavior of crystallite size. Among the investigated mechanical alloying parameters, milling speed had a considerable effect on the dislocation density so that it was reduced by about one order of magnitude when the milling speed decreased from 420 to 300 rpm.
机译：研究了不同的机械合金化参数对ODS-铁素体钢纳米复合粉体组织和形态的影响。使用8毫米的球直径和420 rpm的研磨速度，球与粉的重量比为10：1，在大约30小时内获得了颗粒焊接和断裂之间的稳态。但是，为了完全溶解所使用的合金元素，必须继续进行机械合金化过程，直至研磨80小时。通过X射线衍射轮廓分析计算出的微结构特征的评估显示，尽管在上述条件下的初始研磨阶段，平均晶粒尺寸减小得更为明显，但随着进一步的研磨，最终所有样品中的平均晶粒尺寸几乎达到了相同的值。晶粒尺寸的分布变化也显示出相似的晶粒尺寸行为。在研究的机械合金化参数中，铣削速度对位错密度有很大影响，因此当铣削速度从420 rpm降低到300 rpm时，其降低了大约一个数量级。

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  • 来源
    《Materials Science and Engineering》 |2010年第26期|p.6853-6857|共5页
  • 作者

    R. Rahmanifard; H. Farhangi; A.J. Novinrooz;

  • 作者单位

    School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, North Kargar St., Tehran, Iran Advanced Materials Group, School of Materials Research, NSTRC, P.O. Box 31585-4395 Karaj, Iran;

    School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran;

    Advanced Materials Group, School of Materials Research, NSTRC, P.O. Box 31585-4395 Karaj, Iran;

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  • 正文语种 eng
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  • 关键词

    ODS steel; nanocomposite; microstructural properties; mechanical alloying;

    机译：ODS钢;纳米复合材料微观结构特性机械合金化;

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