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- 저자 : Hefei Huang (검색결과 2 건)
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Ion Irradiation Enhanced Helium Atoms Re-Solution and the Related Hardening in Hastelloy N Alloy
Jizhao Liu,Hefei Huang,Renduo Liu,Jie Gao,Zhenbo Zhu,Yan Li 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.2
Transmission electron microscopy (TEM) and nanoindentation were performed in Hastelloy N alloy with three kinds ofirradiation mode: single He ions, He + Xe (3 dpa) ions and He + Xe (10 dpa) ions. TEM results showed the presence ofnano-sized irradiation-damage defects, such as helium bubbles, xenon bubbles, dislocation loops and precipitates. It wasfound that the helium bubble can grow up via absorbing vacancies, and the helium bubble shrinkage will be also occurreddue to the helium atoms re-solution. In the case of He + Xe (3 dpa) ions irradiation, the helium bubble growth via absorbingvacancies induced by subsequent Xe ion irradiation was more noticeable. As for the sample irradiated by He + Xe (10 dpa)ions, the ion irradiation enhanced helium atoms re-solution played an important role. Moreover, the helium atoms were moreeasily dissolved from small helium bubbles and the mechanisms behind them have also been shed light on. In addition, thedispersed barrier hardening and strengthening superposition models were used to predict the nanohardness increments producedby the different irradiation defects. The nanohardness increments measured by nanoindentation for irradiated sampleswere basically consistent with the calculated nanohardness increments.
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Yuan Wu,Fangjie Li,Ting Wang,Dan Zhao,Hefei Huang,Huigai Li,Shaobo Zheng 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
The factor to deduce grain growth of non-oriented electrical steel sheet during heat treatment was researched in thispaper. Scanning electron microscope equipped with electron backscatter diffraction (EBSD), X-ray diffractionand transmission electron microscope were used to characterize the microstructure, dislocation density and precipitate,respectively. The EBSD results indicated that the grain size increased from 18.7 μm to 56 μm after heattreatment. Meanwhile, the characterization of grain size distribution, dislocation density and precipitates revealedthat the dissolution of Cu2S precipitates, which act as inhibitor, may lead to the grain growth. In addition, the pinningforce of grain boundary and the driving force of grain growth were calculated. Based on experiments resultsand theoretical calculations, the Cu2S precipitates with diameter of less than 39 nm and volume fraction of 1.74 ×10-4would be sufficient to inhibit the ferrite grain growth. Heat treatment provides an efficient way to prompt thegrain growth.
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