等温处理对Ti-6Al-4V合金凝固过程中组织演化的影响（英文）

发布时间：2018-04-21 16:40

本文选题：钛合金 + 等温处理　；参考：《Transactions of Nonferrous Metals Society of China》2015年04期

【摘要】：通过控温感应熔炼装置研究Ti-6Al-4V在凝固过程中等温处理对组织的影响。结果表明,在β相区等温处理,得到由平行片层组成的集束组织;在960°C等温处理,得到一种特殊的钛合金双态组织,由粗化、等轴的初生α相和细化的片层组织组成。初生α片层倾向于断裂、球化,呈现等轴化形态。凝固过程中在(α+β)两相区进行保温,原子迁移、高位错密度以及α相界面张力的共同作用,促使初生α片层等轴化。随等温处理结束,未转变的β基体进一步转化为细的片层,形成双态组织。与直接冷却得到的片层组织相比,晶界α呈不连续形状,片层团尺寸大大降低,整个截面组织均匀。
[Abstract]:The effect of isothermal treatment on the microstructure of Ti-6Al-4V during solidification was studied by means of a temperature-controlled induction melting device. The results show that after isothermal treatment in the 尾 phase region, a cluster structure consisting of parallel lamellar layers is obtained, and at 960 掳C, a special double state microstructure of titanium alloy is obtained, which consists of coarse, equiaxed primary 伪 phase and fine lamellar structure. The primary 伪-lamellae tends to be fractured, spheroidized and equiaxed. During the solidification process, heat preservation, atomic migration, high dislocation density and interfacial tension of 伪 -phase in the (伪尾) two-phase region make the primary 伪 lamellae equiaxed. With the end of isothermal treatment, the untransformed 尾 matrix was further transformed into fine lamellar, forming double state microstructure. Compared with the lamellar structure obtained by direct cooling, the grain boundary 伪 is discontinuous, the size of the lamellar cluster is greatly reduced, and the whole section is uniform.
【作者单位】：西北工业大学凝固技术国家重点实验室;南昌航空大学航空制造工程学院;
【基金】：Project(3102014JCQ01026)supported by the Fundamental Research Fund for the Central Universities,China Project(B08040)supported by the Program of Introducing Talents of Discipline to Universities,China
【分类号】：TG166.5

【共引文献】