(1. 西北有色金属研究院，西安 710016；2. 西北工业大学 材料科学与工程学院，西安 710072)
摘 要: 针对α+β型TC21高强韧钛合金热加工抗力大等问题，采用热氢处理技术，对铸态试样进行0.1%~0.5%(质量分数) 5种不同氢含量的置氢处理和真空退火除氢处理。研究热氢处理过程中TC21钛合金组织结构和晶粒度变化特征，揭示热氢处理对钛合金组织演变的影响规律，探讨钛合金热氢处理组织细化机制。结果表明，热氢处理可以显著细化晶粒，降低TC21铸态组织的变形抗力。
关键字: TC21钛合金；热氢处理；组织细化；晶粒度；变形抗力
（1. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China;
2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:Aiming at the problems such as large deformation resistance during hot working of high strength and high toughness (α+β)-type titanium alloy TC21, all specimens were handled by thermo-hydrogenation treatment technology, such as being hydrogenated respectively in five different hydrogen contents from 0.1%~0.5% (mass fraction), and dehydrogenated by vacuum annealing. The microstructure evolution of TC21 alloys with hydrogenation and dehydrogenation was studied. The effects of thermo-hydrogenation treatment on the microstructure，grain size, and variation regularity of TC21 were investigated. The mechanism of microstructure refinement during thermo- hydrogenation treatment was also discussed. The results show that thermo-hydrogenation treatment can refine the microstructure and reduce the deformation resistance largely.
Key words: TC21 alloy; thermo-hydrogenation treatment; microstructure refinement; grain size; deformation resistance
