Ti-22Al-24.5Nb-0.5Mo合金板材制备及热处理工艺研究  

Research on Preparation and Heat Treatment Process of Ti-22Al-24.5Nb-0.5Mo Alloy Sheet

作　　者：王国栋[1] 王丹 薛少博[1] 苏艳妮 田云飞[1] 郭学鹏[1] Wang Guodong;Wang Dan;Xue Shaobo;Su Yanni;Tian Yunfei;Guo Xuepeng(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《钛工业进展》2023年第1期16-20,共5页Titanium Industry Progress

摘　　要：采用真空自耗电弧炉进行3次熔炼得到Ti-22Al-24.5Nb-0.5Mo合金铸锭,铸锭经五火锻造、三火热轧、板材压校、表面处理等工序,得到规格为δ1.2 mm×600 mm×1000 mm的宽幅薄板。其中,五火锻造及第一火轧制均在单相区进行,第二火轧制为换向轧制并在两相区进行,成品轧制采用保温轧制的方式。结果表明:保温轧制温度为1050℃时板形最优,且经单时效或固溶+时效处理后均为脆性断裂。相比于固溶+时效的热处理方式,经单时效处理析出的等轴α_(2)相与次生针状O相较多,α_(2)相尺寸较大,O相片层细小,可以提高合金的强度。经固溶+时效处理可以提高合金的延伸率,但强度略低于单时效。Ti-22Al-24.5Nb-0.5Mo alloy ingot was obtained by three times vacuum consumable arc melting.The ingot was subjected to five-fire forging,three-fire hot rolling,sheet pressing,surface treatment and other processing,and then the wide sheet with the size of δ1.2 mm×600 mm×1000 mm was obtained.The five-fire forging and first-fire rolling were carried out in the single-phase zone,the second-fire rolling was designed as reversing rolling and carried out in the two-phase zone,and the final product rolling adopted the heat preservation rolling.The results show that when the holding rolling temperature is 1050 ℃,the sheet with the best shape and the fracture mode is brittle fracture after single aging or solution+aging treatment.There are more equiaxed α_(2) phase and secondary acicular O phase precipitated by single aging treatment compared with solution+aging treatment,and with larger α_(2) phase,finer lamella O phase,which can improve the alloy’s strength.After solution+aging treatment,the elongation of the alloy can be increased,but the strength is slightly lower than that of single aging treatment.

关 键 词：Ti-22Al-24.5Nb-0.5Mo合金 宽幅薄板 轧制 热处理 

分 类 号：TG337.6[金属学及工艺—金属压力加工]