(遼寧工程技術(shù)大學(xué)材料科學(xué)與工程學(xué)院，阜新 123000)
摘 要: 研究直接軋制變形工藝對Ti-B20-0.1B合金組織和性能的影響。結(jié)果表明：加入少量硼可顯著細(xì)化鈦合金晶粒尺寸，提高合金的成形能力；Ti-B20-0.1B合金可不經(jīng)過開坯鍛造過程進(jìn)行直接軋制，直接軋制使鑄態(tài)組織中分布在晶界的TiB主要沿著軋制方向定向排列，定向排列的TiB晶須通過應(yīng)力承載機(jī)制提高合金的拉伸強(qiáng)度。隨著直接軋制變形量的增加，Ti-B20-0.1B合金中初生α相發(fā)生顯著再結(jié)晶；經(jīng)過兩相區(qū)固溶及550 ℃時效處理后，直接軋制合金的力學(xué)性能顯著提高。當(dāng)壓下率達(dá)到80%時，時效態(tài)Ti-B20-0.1B合金的抗拉強(qiáng)度達(dá)到1497.5 MPa，而伸長率為6.4%。
關(guān)鍵字: 鈦合金；直接軋制；晶粒細(xì)化；拉伸性能
（College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China）
Abstract:The effect of direct rolling process on microstructure and properties of Ti-B20-0.1B alloy was studied. The result shows that the addition of trace boron significantly refines the grain size of titanium alloy and improves the formability of titanium alloy. Direct rolling can be conducted on Ti-B20-0.1B alloy without the cogging process. Direct rolling makes TiB at the grain boundary in the as-cast microstructure align along the rolling direction. The tensile strength is improved by the aligned TiB whiskers through the load-sharing mechanism. The recrystallzation of primary α in Ti-B20-0.1B alloy occurs with the increase of deformation amount. After being solution-treated in two phases zone and aged at 550 ℃, the mechanical properties of the direct rolling alloy are significantly improved. When the reduction ratio is 80%, the tensile strength of the aged Ti-B20-0.1B alloy is 1497.5 MPa, and the elongation is 6.4%.
Key words: titanium alloy; direct rolling; grain refining; tensile property
