摘要
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 data of thermal simulation compression tests, the processing maps of the GH4169 revert alloy were established according to the dynamic materials model(DMM). The effects of adding revert material on thermal deformation behavior of GH4169 alloy were studied by oxygen and nitrogen elemental analyzing and SEM analyzing. The results show that there are three zones of dynamic recrystallization of GH4169 revert alloy in the region with moderate and low strain rates; the instability zones of the alloy is at the strain rate of 10^(-2.5)s^(-1)~1s^(-1)and the temperature of 900~1 150 ℃;the addition of the revert material makes the content of N and O elements increase,forming a large number of micro porosity, which become the source of cracking and lead to a flow instability during high temperature deformation.
出处
《铸造技术》
CAS
北大核心
2016年第8期1559-1561,1571,共4页
Foundry Technology
基金
国家重点基础研究发展计划资助项目(2012CB722800)
关键词
GH4169合金
返回料
热加工图
GH4169 superalloy
revert material
thermal processing maps
