Research on the Effect of Deformation Heat Treatment on the Microstructure and Mechanical Properties of N36 Zirconium Alloy AITranslate

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Chinese Library Classification Number:TG146.414[金属学及工艺—金属材料]

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N36 zirconium alloy samples before and after equal channel double angular pressing(ECDAP)were annealed at 800℃,and then aged at 580℃for different times(12 h,24 h,48 h).The effects of heat treatment conditions on the microstructure morphology,second phase particles and microhardness of the initial sample and deformed samples were investigated.The results show that large deformation can significantly enhance the recrystallization driving force of annealing process,which is beneficial to the diffusion of alloy elements during subsequent aging process and promotes the dispersed precipitation of second phase particles.As the deformation pass increases,the second phase size of the alloy noticeably refines.With the increase of aging time,the second phase size and the hardness of the alloy increase.When the aging time after annealing increases from 12 h to 48 h,the average size of the second phase in the initial sample increases from 280 nm to 306 nm,and the average size of the second phase in the 4-pass deformed sample increases from 144 nm to 163 nm.The hardness value of the initial sample increases by 7.05%,and the hardness values of the 1-pass and 4-pass deformed samples increase by 11.1%and 11.49%,respectively.It can be seen that the combination of deformation and heat treatment process also greatly improves the mechanical properties of N36 zirconium alloy.