锻造热力规范对GH169合金力学行为和晶粒度的影响  

The Effect of Thermomechanical Parameters of Forging Process on Mechanical Behavior and Grain Size of GH169 Alloy

作　　者：程羽[1] 罗子健[1] 郭乃成 周奠华 

机构地区：[1]西北工业大学 [2]上海钢铁五厂研究所

出　　处：《机械工程材料》1991年第1期36-41,共6页Materials For Mechanical Engineering

摘　　要：在Thermecmastor Z型热加工模拟试验机上研究了变形温度、应变速率和变形程度等热力规范对预锻后的GH 169合金的力学行为和晶粒度的影响。结果表明,该合金的流动应力对变形温度和应变速率极为敏感。变形温度每提高20℃,流动应力可降低20～40 MPa。应变速率每提高一个数量级,流动应力大约增加60～130 MPa。提高应变速率有利于获得细晶组织。在足够的变形程度下,一火终锻以及适当提高锻后冷却速度均有利于获得细晶组织。根据实验结果确定了经预锻的GH 169合金的流动应力与热力规范之间的函数关系。The influence of the thermomechanical parameters, such as deformation temperature, strain rate, reduction and so forth, on the mechanical behavior and grain size of preforged GH 169 alloy was investigated by using Thermecmastor Z universal simulator for hot working. The experimental results indicate that the flow stress of GH 169 alloy is very sensitive to deformation temperature and strain rate. An increment in deformation temperature 20℃ will lead to decrease in flow stress about 20～40 MPa. The strain rate raising an order of magnitude results in increasing the flow stress approximately 60～130 MPa. The high strain rate is conducive to obtaining the fine grain structure. The finish forging with appropriately large reduction and one heat and adequate increasing in cooling rate after finish forging are beneficial to the formation of fine grain structure also. The dependence al the flow stress of preforged GH 169 alloy on the thermomechanical parameters was first defined based on the experimental data.

关 键 词：锻造 热力规范 高温合金 晶粒度 GH 

分 类 号：TG132.32[一般工业技术—材料科学与工程]