首页|Cr涂层对Zr-4合金蠕变行为的影响

Cr涂层对Zr-4合金蠕变行为的影响

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报道化学气相沉积Cr涂层对Zr-4合金蠕变性能的影响以及Cr涂层在服役温度下的热稳定性.利用扫描电镜、电子探针显微分析和电子背散射衍射研究样品的显微组织.结果表明:样品Zr-4基体中晶粒呈等轴状,存在明显的<0001>//ND织构.蠕变后涂层样品的Zr-4合金基体中亚晶界数量明显低于无涂层样品Zr-4合金基体中亚晶界数量,表明Cr涂层显著降低了 Zr-4合金基体在蠕变过程中承载的应力,提高了合金的抗蠕变性能.Cr涂层在长时间扩散实验中保持高稳定性.涂层在高蠕变应力下(350 ℃时不小于157 MPa,400 ℃时不小于137 MPa)出现裂纹.系统总结蠕变断裂的数据,得到了关于稳态蠕变速率与蠕变断裂时间的Monkman-Grant关系式.
Effect of Cr coating on creep behavior of zircaloy-4 alloy
The effects of Cr coating,deposited by chemical vapor deposition,on the creep properties of Zr-4 alloy and the results for its stability during long-time service were reported.Its microstructure was studied by scanning electron microscopy,electron probe microanalysis,and electron backscatter diffraction.Results show that the grains of the Zr-4 matrix were equiaxed,exhibiting<0001>texture parallel to the normal direction(<0001>//ND).Moreover,after the creep test,coated samples displayed a lower number of subgrain boundaries within their matrix compared with uncoated samples.Thus,the application of a Cr coating is instrumental in minimizing the stress on Zr-4,ultimately contributing to an enhancement in creep resistance of the coated samples.The Cr coating exhibits a high stability during long-term diffusion test.The coating cracks at a minimum stress of 157 MPa at 350 ℃ and 137 MPa at 400 ℃.The Monkman-Grant relationship between the steady-state creep rate and creep fracture time was derived using a systematic summary of data pertaining to creep fracture.

Zr-4 alloyCr coatingcreep behaviormicrostructurethermal stability

左鼎、杜沛南、罗威、陈寰、王昱、韦天国、张瑞谦、刘会群

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中南大学材料科学与工程学院,长沙 410083

中国核动力研究设计院反应堆燃料及材料重点实验室,成都 610213

中南大学粉末冶金国家重点实验室,长沙 410083

Zr-4合金 Cr涂层 蠕变行为 显微组织 热稳定性

Key Project of Nuclear Safety and Advanced Nuclear Technology,ChinaState Key Laboratory of Powder Metallurgy,Central South University,China

2019YFB1901002

2024

10.1016/S1003-6326(24)66489-7

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(5)