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用真空非自耗电弧炉熔炼了3种与锆合金中常见第二相粒子成分相同的合金Zr(Fe_x,Cr_(1-x))_2(x=1,2/3,1/3).研究锆合金中第二相粒子的腐蚀行为.第二相合金的粉末在高压釜中经400℃/10.3 MPa过热蒸汽腐蚀不同时间后,利用XRD和能量过滤TEM对腐蚀产物进行了物相分析,结果表明:Cr对第二相合金的氧化速率有很大的影响,增加Cr含量可以提高第二相合金的耐腐蚀性能;由于Fe和Cr在ZrO_2中的固溶度极低,第二相合金被腐蚀形成ZrO_2时,Fe和Cr被排出并形成α-Fe(Cr)和γ-Fe(Cr),最终腐蚀生成(Fe,Cr)_3O_4.不同成分第二相合金的腐蚀行为不同,会对锆合金氧化膜的显微组织演化产生不同的影响,因而也对锆合金的耐腐蚀性能产生不同的影响.
Three kinds of Zr (Fe_x, Cr_ (1-x)) _2 (x = 1, 2/3, 1/3) alloy were melted with vacuum non- The corrosion behavior of the second phase particles in the zirconium alloy was studied.The powder phase of the second phase alloy was subjected to phase analysis by XRD and energy-dispersive TEM after being subjected to superheated steam at 400 ℃ / 10.3 MPa for different time in an autoclave. The results show that Cr has a great influence on the oxidation rate of the second phase alloy. Increasing the Cr content can improve the corrosion resistance of the second phase alloy. Because of the extremely low solid solubility of Fe and Cr in ZrO 2, the second phase When the alloy is corroded to form ZrO 2, the Fe and Cr are expelled to form α-Fe (Cr) and γ-Fe (Cr), which will eventually form (Fe, Cr) Have different effects on the microstructure evolution of the zirconium alloy oxide film and thus have different effects on the corrosion resistance of the zirconium alloy.