Abstract

The formation of anomalous particles (granules) with a significantly different content of microalloying interstitial elements of carbon and boron characterizes the heterogeneity of the composition of rapidly quenched particles of high temperature Ni-based superalloys and stainless steels powders manufactured by the plasma rotating electrode process (PREP) technique. A detailed multiscale experimental study of the microstructure of PREP powders and PM HIP compacts of Ni-based superalloys and stainless steels is carried out in order to reveal the features of the microstructure of anomalous granules in the as-received state and consolidated state. Direct nuclear methods of activation autoradiography on carbon, track autoradiography on boron, metallography, SEM, EDX, and OIM are used. A significant effect of carbon and boron on the dendritic segregation of carbide-forming and boride-forming alloying elements in anomalous granules is revealed. The features of the behavior of carbon and boron, which determine the formation of the microstructure of anomalous granules and their retention in PM HIP compacts, are established.

中文翻译：

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快速淬火的PREP粉末中异常颗粒（颗粒）的性质-II。镍基高温合金和不锈钢的PREP粉末和PM HIP压块的多尺度研究

摘要

碳和硼的微合金化间隙元素含量明显不同的异常颗粒（颗粒）的形成表征了高温镍基高温合金和通过等离子旋转电极工艺制造的不锈钢粉末的快速淬火颗粒组成的不均匀性（ PREP）技术。对镍基高温合金和不锈钢的PREP粉末和PM HIP压块的微观结构进行了详细的多尺度实验研究，以揭示异常颗粒在接受状态和固结状态下的微观结构特征。使用直接核方法在碳上进行放射自显影，在硼上进行放射自显影，金相，SEM，EDX和OIM。揭示了碳和硼对异常颗粒中碳化物形成和硼化物形成合金元素的树枝状偏析的显着影响。建立了碳和硼行为的特征，这些特征决定了异常颗粒的微观结构的形成及其在PM HIP压块中的保留。