钨合金的各向异性及残余应力测试的可行性  

ANISOTROPY OF TUNGSTEN ALLOYS AND ITS POSSIBILITY OF X-RAY RESIDUAL STRESS MEASUREMENT

作　　者：南俊马[1] 何家文[1] 陈文涛 李洪兵 李世君 

机构地区：[1]西安交通大学,710049 [2]西安华山机器制造厂

出　　处：《理化检验（物理分册）》1996年第4期22-24,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：X射线分析显示钨合金经旋锻后存在着择优取向性,据此探讨残余应力测定的可能性,考察加工状态对不同晶面的应力常数和弹性模量的影响。实验表明选用CoKa-(222)虽有织构干扰产生衍射强度的反常分布,但不破坏2θ与Sin^2吵的直线关系,仍适合应力测试。比较而言,选用FeKa-(310)可避免织构的影响,且因谱线尖锐、峰强度高更有利于实际测试。随着表面加工程度增加,半高宽值增大,应力常数值减小。弹性模量因晶面和加工状态的不同而变化,主要是塑性的各向异性所致。The preferred orientation,occurred in the forged tungsten alloys,was revealed by X-ray diffraction. Based on this experimental phenomenon, this paper discusses the possibility of X-ray stress determination for tungsten alloys,and investigates the variation of the stress constants and the elastic moduli for the different diffracting planes under the different processing states. Experiment results show that because of the preferred orientation, the peak intensities of diffraction profiles for (222) are distributed irregularly, but 20 still varies linearly with Sin^2ψ,thus (222) is available for stress measurement. Comparatively, (310) is a bit better for practical applications due to the sharper profiles and the higher peak intensities. Stress constants decrease with the increase of half-width values,which reflect the magnitudes of the processing plastic deformation. Owing to the plastic anisotropy, elastic modulus varies with diffracting planes,and also,with processing states.

关 键 词：钨合金 X射线 应力常数 弹性模量 

分 类 号：TG146.411[一般工业技术—材料科学与工程]