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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。
The texture of the TA18 titanium alloy aviation tube prepared by cold rolling was measured and analyzed along the thickness of the inner, outer and outer layers by means of X-ray diffraction. The texture of the TA18 titanium alloy was also determined by the texture and the anisotropy of the pipe Contractile strain ratio (CSR). The results show that the texture strength of the pipe changes greatly along the depth of the layer, and the change of the texture gradient through the peak density of the crystal orientation distribution function (ODF) is more than 17%. In particular, the texture types of the layers also exist Very different. Only the thinning flat method to take the pipe texture to assess the performance of the pipe, even if the higher level of structural strength CSR will decline, because the pipe is inconsistent depth along the depth of the texture distribution, the emergence of favorable radial The coexistence of texture and unfavorable tangential texture, with unfavorable texture fraction, will lead to a decrease of its CSR value. Determine the depth of the distribution along the depth of the texture to provide a reference for further prediction and improvement of the mechanical properties of the pipe and provide a basis for improving the production process.