钨合金材料X射线应力常数研究

X-RAY STRESS CONSTANT OF TUNGSTEN ALLOY

以生产用的不同成分的钨合金材料加工成等强梁试样，用不同粒度砂纸磨削以模拟实际表面加工状态。用ＣｏＫα和ＦｅＫαＸ射线，分别标定了试样的（２２２）和（３１０）两组晶面的应力常数值，并探讨了钨含量和加工状态对应力常数的影响。实验表明，对于选定的钨合金，成分变化对应力常数值影响不大，随着加工程度增加，应力常数值减小。表面塑性变形量的大小，用衍射谱线的半高宽值表征，并建立了应力常数与半高宽的经验关系，则可根据半高宽值，确定出实际生产中不同加工状态下的应力常数值，测得的残余应力值更为接近实际值。

By using Co Kαand Fe Kαirradiations,the X-ray stress constants of tungsten alloys were determined with X-ray diffraction method.The specimens were manufactured in a share of equi-stress beam,which were machined from the materials with different tungsten contents.The specimens were ground with emery Paper to simulate the finishing state of the real products and their stress constants were determined.The effects of tungsten contents and the prosessing states on the stress constants were discussed.It is found that the stress constants do not change with the change of the tungsten contents,but increase with the increase of the amount of the surface plastic deformation.The surface finishings can be described quantitively in half width of diffraction profiles.Based on the exrerimental results,the relationships between stress constant and half width are built up,thus it is possible to measure the residual stress for the different processing states in the real products.