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材料在塑性状态下拉伸变形,存在载荷失稳和几何失稳两种失稳形式。对于既有应变强化又有应变速率强化的材料,载荷失稳与几何失稳并不同时发生,且失稳应变主要受材料性能参数的控制。高温拉伸变形的Cr15Mn9Cu2Ni1N奥氏体不锈钢,表现出明显的应变速率敏感性,使得载荷失稳与几何失稳不同时发生,几何失稳前的均匀变形量明显增大;随变形温度升高,应变速率敏感性系数增大,几何失稳应变也随之增大。
Materials in the plastic state of tensile deformation, there are two kinds of destabilizing load instability and geometric instability. For both strain-enhanced and strain-rate-enhanced materials, load instability and geometric instability do not occur simultaneously, and the instability strain is mainly controlled by the material performance parameters. High temperature tensile deformation of Cr15Mn9Cu2Ni1N austenitic stainless steel, showed a significant strain rate sensitivity, so that the load instability and geometric instability occurs when the uniform deformation before the geometric instability increased significantly; with the deformation temperature increases, Strain rate sensitivity coefficient increases, the geometric instability strain also increases.