摘要
在1 680℃对K4169镍基铸造高温合金熔体进行超温处理,研究了不同过热时间对元素烧损、宏观晶粒度、凝固微观组织及元素偏析的影响。结果表明:熔体过热时间在10 min以内,熔体超温处理后合金成分仍在允许的范围之内,但是熔体过热时间到15 min时,Cr有严重烧损;熔体过热时间由5 min延长到10 min时,宏观平均晶粒度增大,二次枝晶间距细化,元素偏析减轻;延长到15 min时,枝晶粗化,元素偏析加剧;在熔体过热时间为10 min时,宏观平均晶粒度最高为M-7,二次枝晶间距细化到34.95μm,元素偏析最轻。
The melt superheating treatment was conducted on K4169 Ni-based cast superalloy at 1 680 ℃. The influence between loss of element, macroscopic grain size, solidification microstructure, the segregation degree of alloy elements and different melt superheating time at the same melt superheating temperature is explored. The results show that alloy composition of melt superheat treatment is still in the permitted range within 10 min. Cr has been seriously damaged when melt superheating time has been kept for 15 min at 1 680 ℃. Macroscopic grain size is increased, secondary dendrite arm spacing is refined, and the segregation degree of alloy elements is decreased when the melt superheating time increases from 5 min to 10 min. When melt superheating treatment time is prolonged to 15 min, the dendrite arms become coarse and the segregation degree of alloy elements is increased. Macroscopic grain size and secondary dendrite arm spacing refining size can reach M-7, 34.95 μm respectively and the segregation degree of alloy elements is the lightest when melt superheating temperature time has been kept for 10 min.
出处
《铸造》
CAS
CSCD
北大核心
2012年第12期1388-1392,共5页
Foundry
基金
国家自然科学基金重点项目(50931004)
关键词
镍基铸造高温合金
熔体超温处理
熔体过热时间
凝固微观组织
Ni-based cast superalloy
melt superheating treatment
melt superheating time
solidification microstructure
