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在高温压缩试验数据的基础上,根据动态材料学模型(DMM)理论绘制了GH4169返回料合金的热加工图。采用氧氮元素分析及SEM进行分析,研究了返回料的添加对GH4169合金热变形行为的影响。结果表明:GH4169返回料合金在中、低应变速率下存在3个动态再结晶区域;在应变速率为10~(-2.5)~1 s~(-1)、变形温度为900~1 150℃的区域内,为合金的流变失稳区;返回料的添加使得合金中N、O元素的含量增加,形成大量显微疏松,成为高温变形过程中的裂纹扩展源,导致合金出现大面积的流变失稳。
Based on the experimental data of high temperature compression, the hot working diagram of GH4169 return alloy was drawn according to the theory of dynamic material model (DMM). Oxygen and nitrogen elemental analysis and SEM analysis were carried out to study the effect of the addition of recycled materials on the hot deformation behavior of GH4169 alloy. The results show that there are three dynamic recrystallization regions in GH4169 alloy at medium and low strain rates. When the strain rate is between 10 ~ (-2.5) ~ 1 s ~ (-1), the deformation temperature is 900 ~ 1 150 ℃ In the region, it is the destabilization zone of the alloy. The addition of the return material increases the content of N and O in the alloy, resulting in a large number of microscopic looseness, which becomes the source of crack propagation during high temperature deformation, resulting in a large area of alloy flow Become unstable.