性能的影响
(1. 中北大学 材料科学与工程学院，太原 030051；2. 宝钛集团有限公司 科技部，宝鸡721014)
摘 要: 在Gleeble−3800热模拟实验机上对BTi−62421S合金铸态材料，在温度850～1 050 ℃、应变速率0.01～30 s−1、变形程度70%条件下进行了等温恒应变速率压缩实验。通过金相分析，研究热变形参数(变形温度、应变速率)对BTi−62421S合金微观组织的影响。结果表明，变形温度和应变速率显著影响片层组织等轴化的程度，在β相变点以下，随着温度的升高，片层组织等轴化程度增大，组织更均匀。对变形后的试样做了硬度实验，结果表明合金的硬度开始随着温度的升高而升高，出现峰值后降低。
关键字: BTi−62421S合金；热变形；微观组织；硬度
properties of BTi−62421S alloy
（1. College of Materials Science and Engineering, North University of China, Taiyuan 030051, China;
2. Department of Science and Technology, Baoti Group Co., Ltd., Baoji 721014, China）
Abstract:The compression test of BTi−62421S alloy was carried out at temperatures of 850−1 050 ℃, strain rates of 0.01−30 s−1 and deformation of 70% by the Gleeble−3800 thermal-mechanical simulator. The effects of hot deformation parameters on microstructure of the alloy were investigated by optical microscopy. The results show that the equiaxial degree of lamellar structure is significantly affected by hot deformation parameters, including deformation temperature and strain rate. The deformation temperature and strain rate have significant effects on the equiaxial degree of lamellar structure. The phenomenon (the equiaxial degree of lamellar structure) is increased and the microstructure of alloy is more uniform with the temperature increasing below β phase transition point. Moreover, it can be also seen from hardness test that the hardness of the alloy increases firstly and then decreases with the temperature increasing.
Key words: BTi−62421S alloy; hot deformation; microstructure; hardness
