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吕德斯带
含有微量间隙原子的体心立方金属(如退火或正火的低碳钢或低合金钢),在从弹性变形到塑性变形的过渡过程中,将产生屈服降落现象,在此期间,从试样局部地区开始,形成与拉伸轴大约呈45°角的屈服带。
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electric railway
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