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首页> 外文期刊>Applied Surface Science >Microstructures and corrosion resistance of Zircaloy-4 after surface alloying with copper by high-current pulsed electron beam
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Microstructures and corrosion resistance of Zircaloy-4 after surface alloying with copper by high-current pulsed electron beam

机译：大电流脉冲电子束与铜表面合金化后Zircaloy-4的组织和耐蚀性

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摘要

In present paper, Zircaloy-4 surface alloying with copper (Cu) using a high-current pulsed electron beam (HCPEB) device was firstly studied. For investigating the changes in microstructures and corrosion resistance prior and after surface alloying, a series of characterization methods were adopted. Results revealed that, after surface alloying by HCPEB, a Cu-riched alloying layer with a thickness of about 3 mu m was formed within the melted layer, inside which martensitic transformation was largely inhibited and large numbers of ultra-fine equiaxed beta grains were generated. Most of the Cu elements in the alloying layer were uniformly distributed in the beta-Zr supersaturated solid solution, others were existed in the form of fine dispersed ZrCu SPPs. Besides, Zr (Fe,Cr)(2) SPPs were dissolved into the Zr-matrix within the HCPEB affect area. Compared with initial and directly irradiated specimens, the specimen after surface alloying exhibited extremely excellent anti-corrosion performance at 500 degrees C/10.3 MPa superheated steam, which was mainly attributed to those supersaturated Cu elements.
机译：本文首先研究了使用大电流脉冲电子束（HCPEB）装置将Zircaloy-4表面与铜（Cu）合金化。为了研究表面合金化前后微观组织和耐腐蚀性的变化，采用了一系列表征方法。结果表明，通过HCPEB表面合金化后，在熔融层中形成了厚度约为3μm的富铜合金层，内部大量抑制了马氏体相变并生成了大量超细等轴晶β晶粒。 。合金层中的大多数Cu元素均匀分布在β-Zr过饱和固溶体中，其余以细分散的ZrCu SPP形式存在。此外，Zr（Fe，Cr）（2）SPPs溶解在HCPEB影响区域内的Zr基质中。与初始和直接辐照的试样相比，表面合金化后的试样在500℃/ 10.3 MPa的过热蒸汽下具有极好的抗腐蚀性能，这主要归因于那些过饱和的Cu元素。

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