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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 low-temperature processing and large deformation and strong strain technique were applied to the machining of zirconium alloy tube in electromechanical engineering. The effects of pressing temperature, rolling deformation and annealing on the microstructure of alloy tube were studied. The results show that after hot extrusion deformation, the zirconium alloy tube has undergone dynamic recovery and dynamic recrystallization, in which more than 70% of the grain size is less than 0.5μm, while the grain size of more than 1μm is less After three times of rolling and finishing rolling, the cross-sectional structure of the zirconium alloy tube was in the form of a folded spiral, while the longitudinal section was fibrous, and as the amount of deformation increased, the degree of complete grain blurring was higher. The fiber After the finish rolling, the microstructure of the zirconium alloy tube has been completely recrystallized in the cross section and the longitudinal section, and the average grain size is 2.48 μm.