【摘 要】
：
Macroscopic plastic deformation is strongly related to the interaction and evolution of a series of microstructures in metals.This work aims to develop a ph
【机 构】
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StateKeyLaboratoryforStrengthandVibrationofMechanicalStructures,Xi'anJiaotongUniversity,Xi'an71004
【出 处】
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The 5th Asian Conference on Mechanics of Functional Material
论文部分内容阅读
Macroscopic plastic deformation is strongly related to the interaction and evolution of a series of microstructures in metals.This work aims to develop a physical based plasticity model for austensic HR2 hydrogen resistant steel,which may predict the material behaviors during mechanical deformation with a higher precision.At first,uniaxial and biaxial tensile tests under quasi-static loading conditions are performed,which indicate its mechanical properties such as yield stress,ultimate strength and strain hardening properties.Secondly,the typical microstructures,such as grain morphology,grain size,phase transformation,dislocation density,twin and texture,are examined by metallographic analysis,XRD and EBSD analyses.To investigate the evolution of microstructures,the tensile specimens were loaded up to different strain levels and then unloaded completely.Based on the fundamental mechanism of HR2 plastic deformation observed,a set of evolutionary equations for the dominating microstructures,such as dislocation density,martensite phase transformation,are proposed.Finally,a physical constitutive model of plasticity for HR2 alloys is developed,and further implemented into a numerical FEM code.The validity of this new model is confirmed by comparingto the experimental data and similar constitutive models available in literature.
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