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首页> 外文期刊>Physics of atomic nuclei >The Nature of Anomalous Particles (Granules) in Rapidly Quenched PREP Powders: I. A Multiscale Study of the Heating Zone of the Rotating Electrode Used to Obtain the Rapidly Quenched PREP Ni-Based Superalloy Powder
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The Nature of Anomalous Particles (Granules) in Rapidly Quenched PREP Powders: I. A Multiscale Study of the Heating Zone of the Rotating Electrode Used to Obtain the Rapidly Quenched PREP Ni-Based Superalloy Powder

机译：快速淬火的制备粉末中异常颗粒（颗粒）的性质：I。旋转电极的加热区的多尺度研究，用于获得快速淬火的预制Ni基超合金粉末

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The uniformity of composition of rapidly quenched PREP particles of the powder of high temperature Ni-based superalloys and stainless steels is characterized by an important feature-the occurrence of anomalous particles (granules) with a significantly different content, mainly of microalloying interstitial elements, carbon and boron, as well as active carbide- and boride-forming alloying elements. A detailed multi-scale experimental study of the heating zone of the crater of the Ni-based superalloy electrode after its use to obtain rapidly quenched PREP powder was carried out in order to find the nature and mechanisms of the formation of anomalous granules. Direct nuclear physics methods of activation autoradiography on carbon, track autoradiography on boron, metallography, SEM, EDX, OIM were used. In the electrode crater, the heat-affected zone (HAZ) and the partially melted zone (PMZ) were detected. Intense migration of boron to the electrode surface due to the formation of thermal macrocracks was also revealed. The behavior of carbon is determined by the formation of a thin layer of melt on the surface of the crater. The features of the evolution of the terminal solidification region TSR and incipiently melted regions IMR, the main type of heterogeneity of the composition of the dendritic structure of Ni-based superalloys and stainless steels, are revealed. The interrelation of the evolution of these areas is established, which is a consequence of the thermodynamic principle of the reversibility of the processes of solidification and melting, respectively, in the smelting of an ingot electrode and in the process of subsequent atomization. The analysis of the influence of the behavior of boron, carbon, and the characteristics of the crater structure on the nature and mechanism of the formation of anomalous granules using the PREP method for producing rapidly quenched powder of the Ni-based superalloy is performed.
机译：快速淬火的高温合金和不锈钢粉末的快速淬火制备颗粒的组成的均匀性，其特征在于重要特征 - 发生异常颗粒（颗粒），其具有显着不同的含量，主要是微合金化间质元素，碳和硼，以及活性碳化物和硼化物形成合金元素。进行了用来获得快速淬火的预制粉末后Ni基超合金电极的加热区的详细多尺度实验研究，以寻找异常颗粒的形成性和机制。直接核物理方法对碳活化放射自显影，使用硼，金相，SEM，EDX，OIM上的轨道放射自显影。在电极火山口中，检测热影响区域（HAZ）和部分熔化的区域（PMZ）。还揭示了由于形成热MacRecracks的形成而对电极表面的强烈迁移。碳的行为通过在火山口表面形成薄的熔体层来确定。揭示了末端凝固区域TSR和初始熔化区域IMR的末端熔化区域IMR的主要类型的Ni基超合金和不锈钢组合物的主要类型的异质性。建立了这些区域的演化的相互关系，这是凝固和熔化过程的可逆性的热力学原理，分别在铸锭电极的熔炼中和随后的雾化过程中。进行分析硼，碳和陨石坑结构特征对使用预备法生产Ni基超合金的快速淬火粉末形成异常颗粒的性质和机理的影响。

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