B.X. Zhou
,
M.Y. Yao
,
Z.K. Li
,
X.M. Wang
,
J. Zhou
,
C.S. Long
,
Q. Liu
材料科学技术（英）
In order to optimize the microstructure and composition of N18 zirconium alloy (Zr–1Sn–0.35Nb–0.35Fe–0.1Cr, in mass fraction, %), which was developed in China in 1990s, the effect of microstructure and composition variation on the corrosion resistance of the N18 alloy has been investigated. The autoclave corrosion tests were carried out in super heated steam at 400 °C/10.3 MPa, in deionized water or lithiated water with 0.01 mol/L LiOH at 360 °C/18.6 MPa. The exposure time lasted for 300–550 days according to the test temperature. The results show that the microstructure with a fine and uniform distribution of second phase particles (SPPs), and the decrease of Sn content from 1% (in mass fraction, the same as follows) to 0.8% are of benefit to improving the corrosion resistance; It is detrimental to the corrosion resistance if no Cr addition. The addition of Nb content with upper limit (0.35%) is beneficial to improving the corrosion resistance. The addition of Cu less than 0.1% shows no remarkable influence upon the corrosion resistance for N18 alloy. Comparing the corrosion resistance of the optimized N18 with other commercial zirconium alloys, such as Zircaloy-4, ZIRLO, E635 and E110, the former shows superior corrosion resistance in all autoclave testing conditions mentioned above. Although the data of the corrosion resistance as fuel cladding for high burn-up has not been obtained yet, it is believed that the optimized N18 alloy is promising for the candidate of fuel cladding materials as high burn-up fuel assemblies. Based on the theory that the microstructural evolution of oxide layer during corrosion process will affect the corrosion resistance of zirconium alloys, the improvement of corrosion resistance of the N18 alloy by obtaining the microstructure with nano-size and uniform distribution of SPPs, and by decreasing the content of Sn and maintaining the content of Cr is discussed.
关键词:
Zirconium alloys
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null
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null
,
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陈建伟
,
余泓冰
,
栾佰峰
,
张喜燕
,
刘庆
,
周军
稀有金属材料与工程
利用Taylor松弛约束(Relaxed Constraints,Taylor-RC)模型模拟了2种不同初始取向的Zr-Sn-Nb合金板材在冷轧过程中的织构演变,并对比了模拟结果和X射线衍射(XRD)实测织构之间的差异.结果表明,选用合适的变形系统和临界分切应力比值,Taylor-RC模型可以有效模拟Zr-Sn-Nb合金冷轧中的织构演变.结合模拟所得的2种板材不同变形系统的相对开启量,解释了锆合金冷轧织构的形成原因.
关键词:
锆合金
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Taylor模型
,
冷轧
,
织构模拟
,
初始取向
