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首页> 外文会议>Advanced materials for applications in extreme environments >Characterization of 14YWT As-Atomized Milled Milled and Annealed Powders and HIP Consolidated Alloys
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Characterization of 14YWT As-Atomized Milled Milled and Annealed Powders and HIP Consolidated Alloys

机译：14YWT雾化研磨，退火粉末和HIP固结合金的特性

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Nanostructured ferritic alloys (NFA) are Fe-Cr based ferritic stainless steels containing an ultrahigh density of very stable Y-Ti-O nanofeatures (NFs) that provide dispersion strengthening and radiation damage resistance for candidate Generation IV and future fusion reactor materials. This work is a small and focused part of a larger collaboration to produce large best practice NFA heats. The powders analyzed were rapidly solidified from a melt containing Fe-14%Cr, 3%W, 0.4%Ti and 0.2%Y by gas atomization in Ar, Ar/O, and He atmospheres. Note this represents a different processing path from conventional NFA production where metallic powders are mechanically alloyed with Y_2O_3 by ball milling. Electron probe microanalysis (EPMA), atom probe tomography (APT), transmission electron microscopy (TEM) and small angle neutron scattering (SANS) were used to characterize the powders in the as-atomized, ball milled and ball milled and annealed conditions. EPMA showed the Y is heterogeneously distributed and phase separated in all the as atomized powders, but attritor milling for 20 to 40 h is required to mix the Y. Milling also creates a significant quantity of O as well as N contamination. Subsequent powder annealing treatments, typically at 1150℃, result in the precipitation of a high density of NFs. All the annealed powder variants show a bimodal grain size distribution, but TEM and APT show NFs in both large and small grains. Reducing O content added during milling of the Ar atomized powders increased the precipitate size and decreased the number density, adversely affecting the hardness.
机译：纳米结构铁素体合金（NFA）是基于Fe-Cr的铁素体不锈钢，包含超高密度的非常稳定的Y-Ti-O纳米特征（NFs），可为第四代候选材料和未来的聚变反应堆材料提供弥散强化和抗辐射破坏性。这项工作是大型合作的一小部分，专注于一部分，以产生大型最佳实践NFA加热器。通过在Ar，Ar / O和He气氛中进行气体雾化，使所分析的粉末从包含Fe-14％Cr，3％W，0.4％Ti和0.2％Y的熔体中快速固化。注意，这代表了与常规NFA生产不同的加工路径，在传统NFA生产中，金属粉通过球磨与Y_2O_3机械合金化。使用电子探针显微分析（EPMA），原子探针层析成像（APT），透射电子显微镜（TEM）和小角度中子散射（SANS）来表征在雾化，球磨，球磨和退火条件下的粉末。 EPMA显示，Y在所有雾化粉末中均分布不均，并且发生了相分离，但是将Y混合需要进行20至40 h的研磨机研磨。研磨还会产生大量的O和N污染。随后的粉末退火处理（通常在1150℃下）会导致高密度NFs的析出。所有退火的粉末变体均显示出双峰晶粒尺寸分布，但TEM和APT均显示出大晶粒和小晶粒中的NF。减少在Ar雾化粉末的研磨过程中添加的O含量会增加沉淀物的尺寸并降低数量密度，从而对硬度产生不利影响。

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