摘要
K417镍基铸造高温合金是我国目前用量最大的合金之一,由于该合金900℃延伸率要求较高,在母合金生产中因塑性达不到要求而大量报废,对合金杂质元素以及试棒重熔工艺进行了研究,结果表明:微量杂质元素硒的含量对合金性能有明显不利影响;浇注温度和冷却速率对晶粒度和形态有显著影响,采用适中的浇注温度并缓慢冷却,控制合适的晶粒度有利于合金塑性改善。
K417 nickel-base alloy is one of the largest amount consumption alloy in our country at present.There is a high rate of waste in the production of the master alloy because of the high requirement on elongation at 900℃.In the paper,the content of trace element selenium and thermal parameters have been studied.The results show that: element selenium have significantly adverse effects on ductility;pouring temperature and cooling rate have a significant impact on the grain size and shape.The ductility of the alloy can be improved by the suitable pouring temperature and cooling rate to control the grain size.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2009年第S1期267-270,274,共5页
Journal of Materials Engineering
关键词
延伸率
塑性
冷却速率
晶粒度
elongation
ductility
cooling rate
grain size
