摘要
通过对某发动机超薄细长细晶铸造低压涡轮工作叶片型壳保温方式、型壳预热温度和浇注温度的调整,研究了铸造工艺参数对合金欠铸、冷隔、晶粒度及疏松缺陷的影响。研究结果表明,采用填砂和保温毡包裹对型壳保温,对叶片的欠铸、冷隔和疏松等缺陷的影响相同。当型壳的预热温度高于1 150℃时,导致细长叶片晶粒粗大;而当型壳预热温度为1 100℃,浇注温度为1 450℃时,容易出现欠铸和冷隔缺陷。当采用1 100℃对型壳预热,1 500℃浇注叶片时,能够有效避免冷隔、欠铸、晶粒粗大等缺陷,通过浇冒系统改进,能够解决薄壁细长叶片疏松问题。
By adjusting method ways of shell preserve heat, preheating temperature and casting temperature of a slim slender fine grain casting of low pressure turbine blade, we studied the parameters of casting process which influence misrun, cold-lap, grain size and porosity defect. The result show that the ways of shell preserve heat by sand filling and thermal insulation blanket parcel had same effect on misrun, cold-lap, and porosity defect. When preheat temperature of shell is higher than 1 150 ℃, grains will coarsen. With 1100 ℃ preheated temperature of the shell and 1 450 ℃ of pouring temperature, the misrun and cold-lap defects are easy to occur. When the shell was preheated at 1 100 ℃ and, pouring at 1 500 ℃, the cold-lap, misrum, coarsen grain defects could be effectively avoided. The improvement of gating system can effectively solve the porosity defect in slim slender turbine blade.
出处
《铸造》
CAS
CSCD
北大核心
2013年第8期804-807,共4页
Foundry
关键词
精密铸造
疏松
晶粒细化
涡轮叶片
investment casting
porosity
refine grains
turbine blade
