摘要
通过室温压缩试验、数学模型拟合、金相分析以及洛氏硬度计等手段,研究了冷变形GH3625合金管材中间退火过程中的组织演变规律,并建立了中间退火过程中再结晶晶粒长大方程。研究表明:随着冷变形量的增加,合金组织均匀性逐渐变好,硬度值显著增加,特别是冷变形量0~50%的阶段更为明显;随着退火温度的升高,晶粒长大速率加快;GH3625合金管材在1120℃/15 min/AC下进行退火处理,组织为均匀细小的完全再结晶晶粒,是适宜的中间退火工艺;所建立的晶粒长大模型预测结果与实测值吻合较好。
Microstructure evolution rule during intermediate annealing of cold deformed GH3625 superalloy tubes was studied by means of room-temperature compression test, metallographic analysis and hardness test. An equation of recrystallization grain growth was established by polynomial fitting based an the experiments. The results show that with the increase of the cold deformation degree, the uniformity of the alloy microstructure gradually improves and the hardness value significantly increases for the cold deformation below 50% especially. With the increase of annealing temperature, the grain growth rate accelerates. The microstructure of the GH3625 superalloy tubes with fine and homogeneous recrystallization grains is obtained after the intermediate annealing at 1120 ℃ for 15 min. The predicted grain size by the proposed model is in agreement with the experimental results well.
作者
丁雨田
高钰璧
豆正义
高鑫
贾智
DING Yu-tian GAO Yu-bi DOU Zheng-yi GAO Xin JIA Zhi(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, University of Technology, Lanzhou 730050, Chin)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2017年第2期178-184,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51661019)
甘肃省重大科技专项项目(145RTSA004)
