盛泽民,张晖.TA18钛合金航空管材织构沿层深分布的研究[J].稀有金属材料与工程,2017,46(10):3073~3076.[Sheng Zemin,zhanghui.Research on the Distribution of Texture along the Tube Wall Thickness of TA18 Alloy Tube[J].Rare Metal Materials and Engineering,2017,46(10):3073~3076.]
TA18钛合金航空管材织构沿层深分布的研究
投稿时间:2015-07-08  修订日期:2015-11-27
中文关键词:  钛合金  织构  取向分布函数  梯度
基金项目:国家自然科学基金资助(项目号××××)
中文摘要:
      利用X射线衍射技术对冷轧制备的TA18钛合金航空管材的内、中、外三层的织构进行测定与分析,与此相对应,还测试了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。采用减薄展平法取管材中层进行织构测定时,即使织构强度等级较高,也会出现CSR下降的情况。原因在于管材存在有利的径向织构和不利的切向织构共存的沿层深不均匀织构分布,不利织构比重过大将导致其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。
Research on the Distribution of Texture along the Tube Wall Thickness of TA18 Alloy Tube
英文关键词:Titanium alloy  texture  orientation distribution function (ODF)  gradient
英文摘要:
      The texture of the inner layer, middle layer and outer layer of a cold rolled TA18 alloy tube were investigated and analyzed by means of X-ray diffraction technique. Correspondingly, contractile strain ratio (CSR), which can relate the texture to mechanical property anisotropy of a tube, was also tested. The experimental results show that texture intensity through the tube wall exist big gradient on the tube, directed by the peak value of orientation density of the orientation distribution function(ODF), and the variation gradient is over 17%, especially, texture types are different greatly among the layers. Measuring the texture of the middle layer by the method of thinning and flattening ,we discovered that although texture intensity was high for this tube,its CSR is only 0.95,less than the use standard of 1.3. The reason is due to that the texture is not uniform along the tube wall, there exists favorable texture in radial direction and negative texture in tangential direction, and strong negative texture leads to deterioration of the mechanical property. Confirming the distribution of texture along the tube wall can provide reference for forecasting and improving mechanical properties of the tube, and help to optimize the production process.
作者单位E-mail
盛泽民 西安交通大学理学院材料物理系 m15090359861@163.com 
张晖 西安交通大学理学院材料物理系 zhanghui@mail.xjtu.edu.cn 
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