TA15钛合金大型锻件“中心亮线”组织缺陷形成及抑制措施  

Formation and control measures on microstructure defect of “center bright line” for TA15 titanium alloy large forgings

作　　者：王德勇[1] 莫安军 杨立新 闵武 魏明刚 余胜峰 栗文强 谢静 Wang Deyong;Mo Anjun;Yang Lixin;Min Wu;Wei Minggang;Yu Shengfeng;Li Wenqiang;Xie Jing(Shenyang Aircraft Industry(Group)Co.,Ltd.,Shenyang 110136,China;China National Erzhong Group Deyang Wanhang Die Forging Co.,Ltd.,Deyang 618000,China)

机构地区：[1]沈阳飞机工业(集团)有限公司,辽宁沈阳110136 [2]中国第二重型机械集团德阳万航模锻有限责任公司,四川德阳618000

出　　处：《锻压技术》2022年第2期25-29,87,共6页Forging & Stamping Technology

基　　金：国家工信部2018年绿色制造系统集成项目。

摘　　要：通过工艺试验研究了热变形过程中TA15钛合金大型锻件的组织性能演变规律。结果表明:TA15钛合金在950、965和980℃的条件下进行热变形,变形量过大,锻件中心部位发生显著再结晶细化,形成"双套"组织。新生α相组织约为3~5μm,与初生α相组织(约为10μm)存在显著差异,从而导致了锻件低倍组织呈现出"中心亮线"组织缺陷,该组织缺陷所在区域的强度和塑性等力学性能比正常区域低。同时,发现随着变形温度上升,变形量降低至80%以下,可抑制组织缺陷的产生、提高锻件性能。通过探究"中心亮线"组织缺陷的形成原因,获得了抑制组织缺陷产生的工艺条件,为高性能大型钛合金整体锻件成形制造提供了依据。The evolution law of microstructure and properties for TA15 titanium alloy large forgings during thermal deformation process was studied by process test. The results show that when TA15 titanium alloy undergoes thermal deformation at 950,965 and 980 ℃, excessive thermal deformation occurs, and the significant recrystallization refinement in the center of forgings is found to form a “double set” structure. Furthermore, the new α-phase structure is about 3-5 μm, which is significantly different from the primary α-phase structure(about 10 μm), resulting in microstructure defects of “center bright line” in the macrostructure of forgings, and the mechanical properties such as strength and plasticity in the microstructure defects region are lower than those in the normal region. Meanwhile, it is found that with the increasing of temperature, the deformation amount decreases to less than 80%, and the generation of microstructure defects is inhibited and the performance of forgings is improved. So by exploring the formation reason of “center bright line” microstruture defects, the process conditions of suppressing microstructure defects are obtained, which provides a basis for the forming of high performance large titanium alloy integral forgings.

关 键 词：TA15钛合金 大型锻件 中心亮线 微观组织 力学性能 

分 类 号：TG316.2[金属学及工艺—金属压力加工]