机电工程用锆合金管的加工与组织演变

Processing and Microstructure Evolution of Zirconium Alloy Tubes Used in Mechanical and Electrical Engineering

采用低温加工和大变形强应变技术对机电工程用锆合金管进行了加工处理,研究了加压温度、轧制变形和退火对合金管显微组织的影响及其演变规律。结果表明,在经过热挤压变形后,锆合金管坯发生了动态回复和动态再结晶,其中,70%以上的晶粒尺寸都小于0.5μm,而尺寸在1μm以上的晶粒的含量较少;经过三次轧制和终轧处理后,锆合金管中的横截面组织呈折叠旋涡状,而纵截面组织呈纤维状,且随着变形量的增加,完整晶粒的模糊程度更高,纤维状组织更加细密;终轧后进行退火处理,锆合金管横截面和纵截面中都可见组织已经发生了完全再结晶,平均晶粒尺寸为2.48μm。

The alloy tubes for mechanical and electrical engineering were processed by low temperature process and large deformation, the effect of compression deformation and annealing temperature on roiling tube microstructure of the alloy and its evolution law were studied. The results show that, after hot extrusion deformation, dynamic recovery and dynarrfic recrystallization occurs in zirconium alloy tube, the grain size of more than 70% is less than 0.5 μm, while little grain size is less than 1 ixm; after three rolling and finishing treatment, the cross section structure of zirconium alloy tube is folded in a spiral shape, and the longitudinal section structure is fibrous, and with the increase of deformation degree, the integrity of the complete grain is higher, the fibrous structure is more dense. After annealing, in the cross section and longitudinal section of the zirconium alloy tube, the structure is completely recrystallized, with the average grain size of 2.48 μm.