TA18钛合金航空管材织构沿层深的分布

发布时间：2018-05-04 10:52

本文选题：钛合金 + 织构　；参考：《稀有金属材料与工程》2017年10期

【摘要】：利用X射线衍射技术对冷轧制备的TA18钛合金航空管材沿壁厚内、中、外3层的织构进行测定与分析,还测试了由织构决定、且能反映管材各向异性特性的收缩应变比(contractile strain ratio,CSR)。结果表明:管材织构强度沿层深会形成较大的梯度变化,通过晶体取向分布函数(ODF)的峰值密度显示的织构梯度变化大于17%,特别是各层的织构的类型也存在很大差别。仅采用减薄展平法取管材中层织构评定管材性能时,即使织构强度等级较高,也会出现CSR下降的情况,原因在于,管材存在沿层深不一致的织构分布,出现有利的径向织构和不利的切向织构共存的情况,不利织构分数过大,将导致其CSR值降低。确定织构沿层深的分布为进一步预测并改进管材的力学性能提供参考,并为改善生产工艺提供依据。
[Abstract]:The texture of the inner, middle and outer layers of TA18 titanium alloy aeronautical pipe prepared by cold rolling was measured and analyzed by X-ray diffraction technique. The contractile strain ratio, which is determined by texture and can reflect the anisotropy of the tube, was also tested. The results show that the texture strength of the pipe varies greatly along the depth of the layer, and the change of texture gradient is greater than 17 by the peak density of the crystal orientation distribution function (ODF), especially the type of texture of each layer is also very different. When using thinning and flattening method to evaluate the properties of the pipe, even if the texture strength grade is higher, the CSR will decrease. The reason is that the pipe has different texture distribution along the layer depth. The coexistence of favorable radial texture and unfavorable tangential texture will lead to the decrease of CSR value if the unfavorable texture fraction is too large. The distribution of texture along the layer depth provides a reference for further prediction and improvement of the mechanical properties of the pipe and provides a basis for improving the production process.
【作者单位】：西安交通大学;北京航空材料研究院;
【基金】：国家自然科学基金委员会与中国民用航空局联合资助项目(61179068) 航空科学基金资助项目(JZ20141106)
【分类号】：TG146.23;TG335

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