锆合金吸氢及脱氢过程中的组织演变
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摘要
采用XRD分析锆合金吸氢和脱氢过程中的相组成,并通过金相检查观察其微观组织形貌。结果表明:锆合金吸氢和脱氢过程中的相组成与过程无关;微观组织形貌仅在α+δ+γ三相共存区存在明显差异,吸氢过程中氢化锆的网状特征更加明显,但在其余相区,氢化锆的组织形貌仅取决于氢含量;微观形貌的差异主要是锆合金吸氢和脱氢过程中氢在基体中扩散机制不同而引起;吸氢过程中,氢在基体中扩散受晶界扩散控制,而脱氢过程中,氢在基体中扩散受晶内扩散控制。
The phase compositions of zircaloy changing in hydrogenation and dehydrogenation process were analyzed by XRD.The microstructure was observed by metallographic.The results show that the phase compositions of zircaloy changing in the two process are same.The microstructures changing in the two process is only different in α+δ+γ three phase zone.The network-like distribution phase changing in the hydrogenation progress is more significant than that in the dehydrogenation process.In the rest phase zone,the hydrogen content determines the microstructures of zirconium hydride.The main reason for this phenomenon is that the hydrogen diffusion mode in the hydrogenation is different to that in the dehydrogenation process.The hydrogen diffusion in the hydrogenation progress is controlled by the grain boundary diffusion,and the hydrogen diffusion in the dehydrogenation progress is controlled by the crystal diffusion.
The phase compositions of zircaloy changing in hydrogenation and dehydrogenation process were analyzed by XRD.The microstructure was observed by metallographic.The results show that the phase compositions of zircaloy changing in the two process are same.The microstructures changing in the two process is only different in α+δ+γ three phase zone.The network-like distribution phase changing in the hydrogenation progress is more significant than that in the dehydrogenation process.In the rest phase zone,the hydrogen content determines the microstructures of zirconium hydride.The main reason for this phenomenon is that the hydrogen diffusion mode in the hydrogenation is different to that in the dehydrogenation process.The hydrogen diffusion in the hydrogenation progress is controlled by the grain boundary diffusion,and the hydrogen diffusion in the dehydrogenation progress is controlled by the crystal diffusion.
引文
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[2]钟学奎,陈伟东,闫国庆.负向电压对氢化锆表面防氢渗透层的影响[J].内蒙古科技大学学报,2011,30(2):150-153.
[3]Simnad M T.The U-Zr Hx alloy:Its properties and use in triga fuel[M].GA Project,1980,4314.
[4]徐海生,兰光友.锆-铌合金的氢化[J].核动力工程,2008,29(1):74.
[5]熊炳昆,温旺光,杨新民,等.锆铪冶金[M].冶金工业出版社,2010:24.
[6]杨芳林,张建军,宋启忠.锆合金管材氢化物生长方式的研究[J].稀有金属材料与工程,1999,28(4):214-217.