摘要
GH710合金具有优异的耐高温性能,但由于高合金化、低塑性的特点,使其在热加工过程中易产生裂纹和流动失稳等缺陷,限制了合金的应用。采用真空感应+真空自耗重熔工艺制备铸锭,通过包套挤压方法,制备出高质量的GH710合金棒材。利用Gleeble-1500试验机开展等温压缩试验,研究了挤压态GH710合金在不同变形条件下的变形行为(变形温度(T)为1050~1150℃,应变速率(ε)为0.01~5 s^(-1),真实应变为0.9)。基于双曲正弦型Arrhenius方程建立挤压态GH710合金本构方程,以动态材料模型为基础构建了热加工图,通过盘形锻件锻造过程有限元模拟和物理试验所获得的时间-载荷曲线对比,验证合金本构模型的可靠性。结果表明:挤压态GH710合金的热激活能(Q)为1004801 J·mol^(-1);根据热加工图推荐了挤压态GH710合金最优热加工参数范围T为1100~1120℃,ε为0.01~0.03 s^(-1);采用挤压态GH710合金本构模型进行的仿真模拟与物理试验结果能较好的吻合;研究结果可为挤压态GH710合金的锻造工艺设计提供指导。
The service temperature,metallurgical quality and mechanical properties of aero-engine turbine disk have a decisive influence on its performance and safety.And with the increase of thrust to weight ratio of aero-engine,the gas temperature in front of turbine is increasing,and the requirement of temperature bearing capacity of turbine disc alloy is also higher and higher.Aero-engine turbine disk materials are gradually developed from heat-resistant steel to superalloy,and wrought superalloy plays a very important role of superalloy.In addition to development of new superalloys,the research and understanding of existing superalloys are also major directions in order to achieve the purpose of process stability,reliable product quality,cost reduction and efficiency increase.GH710 alloy was developed in the 1980s and had excellent high-temperature resistance,commonly used in aero-engine turbine discs.It could withstand the operating temperature of 850℃for a long time and 980℃for a short time.However,due to the large number of alloying elements contained in GH710 alloy,it would increase the deformation resistance of the alloy,resulting in difficulty of hot working.GH710 alloy turbine disks prepared by traditional upsetting-stretching process had serious micro cracks,uneven microstructure and low mechanical properties.Therefore,the application of GH710 alloy was limited.It was necessary to study the hot working performance of GH710 alloy.In recent years,the researchers had mainly based on traditional upsetting-stretching process.With the development of extrusion technology,the extrusion was more and more applied in the manufacture of difficult-to-deform superalloy.In this paper,the thermal deformation behavior of GH710 alloy prepared by canning extrusion processes was studied,and the raw material(ingot)for as-extruded GH710 alloy was prepared by vacuum induction melting and vacuum arc remelting process.The isothermal compression experiments of as-extruded GH710 alloy were carried out on Gleeble1500 test machine unde
作者
陈由红
兰博
李金栋
马星宇
方爽
林莺莺
Chen Youhong;Lan Bo;Li Jingdong;Ma Xingyu;Fang Shuang;Lin Yingying(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2023年第7期986-994,共9页
Chinese Journal of Rare Metals
基金
国家自然科学基金青年基金项目(519901218)资助
