变形量及固溶处理对IMI834板材微观组织及织构的影响

Effects of Rolling Deformation and Solution Treatment on Microstructure and Texture of IMI834 Plate

摘要:

IMI834作为一种高性能的600 ℃耐高温钛合金，其应用受限于加工窗口狭窄、变形能力弱及变形抗力大等问题。调控板材组织与织构可通过控制轧制厚度及轧后热处理实现，但相关研究尚不充分。本研究采用扫描电子显微镜与背散射电子衍射技术，探究了变形量及固溶处理温度对IMI834板材微观组织与织构的影响。结果表明，随轧制变形量增加，板材组织逐渐转变为带状组织及等轴细晶组织，其中带状组织呈现RD织构，且换向轧制能提升等轴细晶组织比例；适宜的固溶处理可有效削弱基面织构，从而降低板材的变形各向异性。

Abstract:

IMI834, as a high-performance titanium alloy resistant to 600 ℃, faces limitations in its application due to issues such as a narrow processing window, weak deformation ability, and high deformation resistance. Although it is feasible to control the sheet's microstructure and texture by adjusting the rolling thickness and post-rolling heat treatment, related research remains insufficient. In this study, the effects of deformation and solution treatment temperature on the microstructure and texture of IMI834 sheets was investigated by scanning electron microscopy and back scattered electron diffraction techniques. The results indicate that as the rolling deformation increases, the sheet's microstructure gradually transforms into banded and equiaxed fine-grained structures, in which the banded structure exhibits an RD texture. Additionally, reversing the rolling direction can increase the proportion of equiaxed fine-grained structures. Appropriate solution treatment can effectively weaken the basal texture, thereby reducing the sheet's deformation anisotropy.