试验三 金属塑性变形与再结晶(国外英文资料).docVIP

实验三 金属塑性变形与再结晶(国外英文资料)Experiment three metal plastic deformation and recrystallizationOne, the purpose of the experimentThe changes of the properties and characteristics of the tissues after the metallographic treatment and after recrystallization. The influence of deformation degree on the structure and performance of the recrystallized annealing. To deepen the understanding of process hardening and recrystallization.Second, the basic principleMicrostructure and performance change of metal cold plastic deformationThe plastic deformation of metal cold plastic deformation of metal under recrystallization temperature. The metal plastic deformation occurs, permanent changes have taken place in appearance and size, its internal grain from isometric gradually along the direction of processing elongation, also appeared within the grain slip band or twin belt, when the deformation of a high degree of grain boundary disappear, grain to be drawn into a fibrous. Accordingly, the hardness, strength, rigidity and resistance of metal materials are increased, while plastic, toughness and corrosion resistance are reduced. This phenomenon is called process hardening.In order to observe the slippage band, the test samples that have been polished and corroded are observed by microscopic tissue after the appropriate amount of plastic deformation. Note: the microscope slide belt with grinding marks is different, generally grinding crack across the grain boundary, its direction remains unchanged, while the slip band appeared in the grain interior, and is generally not through the grain boundary.Microstructure and performance change of metal heating after cold plastic deformationWhen the metal is cold and plastic deformation, it will be reshaped, crystallized and raised with grain as the heating temperature rises.(1) the ability of the atomic activity to be low when the heating temperature was low, the metal microstructure was unchanged, and the characteristics of the fibrous tissue were