热加工参数对GH4700镍基合金组织的影响  

Effect of Hot Working Parameters on Microstructure of GH4700 Superalloy

作　　者：曾莉[1] 王岩[1] 李莎[1] 李阳[1] 金宪哲[1] 

机构地区：[1]太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,山西太原030003

出　　处：《热加工工艺》2013年第5期5-7,共3页Hot Working Technology

基　　金：国家"973"计划项目(2012CB723905)

摘　　要：借助Gleeble1500热模拟实验机,对GH4700镍基合金热加工组织演变规律进行了研究。结果表明:合金在热压缩过程中发生了动态再结晶,形核地点主要为晶界、原始晶粒内部的大块一次碳化物和晶内的形变带。随着热加工温度的升高和应变速率的减小,动态再结晶比例增大,晶粒尺寸减小。GH4700合金电渣锭在温度1140～1170℃、应变速率0.01～0.1s-1条件下开坯,可以获得晶粒均匀的组织。The microstructure evolution of GH4700 nickel-based alloy during hot working were researched by using Gleeblel500 thermal simulation machine. The results show that： the dynamic recrystallization behavior is occurred in the hot compression process of alloy, the dynamic recrystallization nucleation location is mainly in the grain boundaries, the big primary carbide within the original grains and deformation bands. With increaset of he thermal working temperature and decrease of strain rate, the proportion of dynamic recrystallization increases, and the grain size decreases. In the conditions of deformation temperatures at 1140-1170℃ and the strain rate at 0.01-0,IsI , the uniform grain sizes of electro-slag remelting ingot of GH4700 alloy can be obtained.

关 键 词：镍基合金 热变形 动态再结晶 

分 类 号：TG301[金属学及工艺—金属压力加工]