铸造技术2026，Vol.47Issue(4)：413-422,10.DOI:10.16410/j.issn1000-8365.2026.6008
低温预形变热处理对铸造Ti-48Al-2Cr-2Nb合金显微组织的影响
Effects of Low-temperature Pre-deformation Heat Treatment on the Microstructure of As-cast Ti-48Al-2Cr-2Nb Alloys
摘要
Abstract
TiAl alloys possess advantages such as low density,excellent high-temperature oxidation resistance,and comprehensive high-temperature mechanical properties,making them highly regarded as lightweight high-temperature structural materials in the aerospace industry.However,the inherent brittleness of TiAl alloys at room temperature severely limits their potential for engineering applications.Consequently,improving the microstructural uniformity and grain refinement has become a research focus for TiAl alloys.The influence of deformation heat treatment parameters on microstructural evolution in cast Ti-48Al-2Cr-2Nb alloys was investigated by employing a combination of low-temperature pre-deformation and subsequent heat treatment.Additionally,in situ observations using high-temperature laser scanning confocal microscopy were employed to analyse phenomena such as recrystallization,grain growth,and lamellar precipitation in the low-temperature deformed microstructure.Starting from an initial coarse microstructure of the as-cast alloy with lamellar colonies of approximately 400 μm,fine-grained duplex microstructures with lamellar colonies and γ grain sizes of 21 and 12 μm can be obtained through scientifically controlled low-temperature pre-deformation above the ductile-to-brittle transition temperature and subsequent heat treatment in the α+γ phase region.关键词
TiAl合金/形变热处理/显微组织/晶粒细化Key words
TiAl alloys/thermomechanical treatment/microstructure/grain refinement分类
矿业与冶金引用本文复制引用
荣川,周斯曼,杨劼人..低温预形变热处理对铸造Ti-48Al-2Cr-2Nb合金显微组织的影响[J].铸造技术,2026,47(4):413-422,10.基金项目
国家自然科学基金面上项目(52371035) （52371035）
四川省重大科技专项(2023ZDZX0026) （2023ZDZX0026）
