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研究了中间热处理工艺对Zr-1Nb-0.2Y(质量数,%)合金在420℃空气中氧化性能的影响.结果表明,通过变形及适当的多道次退火,可以有效控制合金化元素的析出,最终获得合理组织与最佳性能.随轧制及热处理道次加深,合金的抗氧化性能逐渐提高,由中间退火工艺为640℃,3 h+570℃,3 h得到的最终样品具有最优的抗氧化性能.合金的位错密度对氧化性能的影响并不显著.TEM形貌观察以及沉淀相EDS分析表明,中间热处理工艺通过影响沉淀相的体积分数、平均尺寸、合金化元素Nb+Y含量(平均含量与总含量)等因素来影响Zr-1Nb-0.2Y合金的氧化性能.沉淀相的体积分数、尺寸和合金元素含量等因素通过协同作用共同影响Zr-1Nb-0.2Y合金的氧化性能.
The effect of intermediate heat treatment process on the oxidation performance of Zr-1Nb-0.2Y (mass%) alloy in air at 420 ℃ was studied.The results show that the precipitation of alloying elements can be effectively controlled by deformation and proper multi-pass annealing , Finally get the reasonable organization and the best performance.With the rolling and heat treatment pass deeper, the oxidation resistance of the alloy gradually increased, the intermediate annealing process for 640 ℃, 3 h +570 ℃, 3 h the final sample has the best The effect of dislocation density on the oxidation performance is not significant.The SEM observation of TEM and the EDS analysis of the precipitate phase show that the intermediate heat treatment process affects the volume fraction of the precipitated phase, the average size, the alloying elements Nb + Y (Average content and total content) and other factors affect the oxidation performance of Zr-1Nb-0.2Y alloy.The volume fraction, size and alloying element content of the precipitated phase affect the oxidation of Zr-1Nb-0.2Y alloy synergistically performance.