In this work, new oxide dispersion strengthened (ODS) ferritic steels have been produced by powder metallurgy using an alternative processing route and characterized afterwards by comparing them with a base ODS steel with Y₂O₃ and Ti additions. Different alloying elements like boron (B), which is known as an inhibitor of grain growth obtained by pinning grain boundaries, and complex oxide compounds (Y-Ti-Zr-O) have been introduced to the 14Cr prealloyed powder by using mechanical alloying (MA) and were further consolidated by spark employing plasma sintering (SPS). Techniques such as x-ray diffraction (XRD), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) were used to study the obtained microstructures. Micro-tensile tests and microhardness measurements were carried out at room temperature to analyze the mechanical properties of the differently developed microstructures, which was considered to result in a better strength in the ODS steels containing the complex oxide Y-Ti-Zr-O. In addition, small punch (SP) tests were performed to evaluate the response of the material under high temperatures conditions, under which promising mechanical properties were attained by the materials containing Y-Ti-Zr-O (14Al-X-ODS and 14Al-X-ODS-B) in comparison with the other commercial steel, GETMAT. The differences in mechanical strength can be attributed to the precipitate’s density, nature, size, and to the density of dislocations in each ODS steel.

中文翻译：

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使用新型氧化物形成剂和B作为晶粒生长抑制剂来开发新型14 Cr ODS钢

在这项工作中，采用替代工艺通过粉末冶金生产了新的氧化物弥散强化（ODS）铁素体钢，然后将其与具有Y ₂ O ₃的基础ODS钢进行了比较和钛的添加。通过机械合金化，已将不同的合金元素（例如硼（B））（已知是通过钉扎晶界而获得的晶粒生长抑制剂）和复合氧化物（Y-Ti-Zr-O）引入到14Cr预合金粉末中（ MA），并通过采用等离子烧结（SPS）的火花进一步固结。使用诸如X射线衍射（XRD），电子反向散射衍射（EBSD）和透射电子显微镜（TEM）的技术来研究获得的微结构。在室温下进行了微拉伸试验和显微硬度测量，以分析不同发育的显微组织的机械性能，这被认为可以在含有复合氧化物Y-Ti-Zr-O的ODS钢中获得更好的强度。此外，进行了小型冲孔（SP）测试以评估材料在高温条件下的响应，在此条件下，含有Y-Ti-Zr-O（14Al-X-ODS和14Al-X-ODS的材料）可获得有希望的机械性能-B）与其他商用钢GETMAT相比。机械强度的差异可归因于每种ODS钢中沉淀物的密度，性质，大小以及位错密度。