摘要
研究了K4169高温合金在不同浇注温度下向熔体中加入和不加入细化剂的晶粒尺寸和组织特征。结果表明:降低浇注温度或者添加细化剂都能减小晶粒尺寸和提高等轴晶比例。在浇注温度1520℃时,向熔体中加入细化剂,可使圆柱锭的晶粒尺寸由原来的10.56 mm细化至2.84 mm,断面等轴晶比例由原来的10%提高到81%。
Grain size and microstructure characteristics of casting superalloy K4169 with and without adding the grain refiners to melt were investigated in different pouring temperatures. The results indicate that lowering pouring temperature or adding refiners to the melt can lead to grain refinement and improve the proportion of equiaxed grains. At the higher pouring temperature of 1520℃, adding refiners to melt could refine grain size of cylindrical ingots from 10.56 mm to 2.84 mm, and the prooortion ofequiaxed grains at transverse cross-section could be improved from 10% to 81%.
出处
《热加工工艺》
CSCD
北大核心
2015年第3期34-37,共4页
Hot Working Technology
基金
国家高技术研究发展计划项目(2012AA03A511)
国家科技重大专项(20092X04006-42)
西北工业大学基础研究基金项目(JC201235)
关键词
高温合金
晶粒细化
浇注温度
晶粒细化机理
superalloy
grain refinement
pouring temperature
mechanisms of grain refinement
