摘要
利用金相和扫描电镜观察了液态金属冷却技术(LMC)制备的DSM11合金重型燃机叶片不同位置的定向凝固组织和热处理组织,并利用持久试验机测试了相应状态下980℃×220 MPa的持久性能。研究表明,随着叶片取样位置远离冷却盘,缩孔的尺寸增加,η相的析出倾向增大,γ+γ′共晶尺寸增加,导致了叶片不同位置热处理组织和持久性能的差异。
The as-cast and heat-treated directional solidified microstructures in different positions of DSM11 industrial gas turbine blade prepared by liquid metal cooling were studied by OPM and SEM, and the stress rupture property at 980℃×220 MPa was tested after different ]heat treatment. The results show that, with the increase of the distance of sampling position from the chill plate, the size of shrinkage and eutectic in as-cast blade enlarges, the separating tendency of phase increases. This leads to the differences of heat-treated microstructure and stress rupture property of the blades in different positions.
出处
《铸造技术》
CAS
北大核心
2012年第7期807-810,共4页
Foundry Technology
基金
国家重点基础研究项目(2010CB631201)
国家自然科学基金资助项目(51171193)
关键词
重型燃机叶片
LMC工艺
定向凝固
显微组织
持久性能
industrial gas turbine blade
liquid metal cooling process
directionally solidified
microstructure
stress rupture property
