钨钼复合靶的残余应力

Residual Stress in W-Mo Composite Target

研究了变形参数，热膨胀和冷却方式对钨钼复合靶残余应力的影响。结果表明：锻造温度越高，锻造能量越大，残余应力越大；钨钼热膨胀不同引起的残余应力在钼层表面表现为拉应力，大小为７３ＭＰａ～１３５ＭＰａ；快冷使得钼层表面表现为压应力。当残余拉应力达到一定值时，将引起应力裂纹，这种裂纹长且细。

The effects of deforming parameters, thermal expansion and cooling condition on residual stress are investitaged in this paper. The higher the deforming temperature and the higher the air pressure, the higher the residual stress. Since the thermal expansion coeffcient of W is smaller than that of Mo, the residual stress on the surface of Mo is tensile and equal to 100MPa. The residual stress on the surface of Mo is compressive stress after rapid cooling. Obviously the Mo cracks when the residual stress reaches the tensile strengh of Mo.