薄细长细晶叶片冶金缺陷影响因素研究  

Analysis of Factors Influencing Metallurigical Defects in Slender Grain-Fined Blades

作　　者：王永明[1] 黄爱华[1] 张建国[1] 祝世哲[1] 崔树森[1] 

机构地区：[1]沈阳黎明航空发动机(集团)有限责任公司

出　　处：《特种铸造及有色合金》2014年第2期191-193,共3页Special Casting & Nonferrous Alloys

摘　　要：通过对薄细长细晶低压涡轮工作叶片浇冒系统、型壳预热温度、型壳保温方式和浇注温度的调整,研究了铸造工艺参数及浇冒系统对铸件浇不足、冷隔、晶粒度及缩松缺陷的影响。结果表明,采用填砂或保温毡包裹进行型壳保温,对叶片晶粒粗大、浇不足、冷隔和缩松等缺陷的影响相同。当型壳预热温度高于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,容易出现浇不足和冷隔。当型壳预热温度为1 100℃,浇注温度为1 500℃时,能够有效避免冷隔、浇不足、晶粒粗大等缺陷,同时,通过浇冒系统改进,能够解决薄壁细长叶片缩松问题。Through adjusting gating-riser system,pre-heating temperature of mold shell,holding ways of mold shell and pouring temperature of thinned-slender grain-fined blade for low pressure turbine,effects of processing parameters and gating-riser system on cold-shut,misrun,grain size and shrinkage porosity in the alloy blades were analzyed.The results reveal that with pre-heating temperature of mold shell more than 1 150 ℃,gain size in the blades becomes coarse,while pre-heating temperature of 1100℃and pouring temperature of 1 450 ℃,misrun and cold shut defects in the blades can be often observed.With pre-heating temperature of 1 100 ℃and pouring temperature of 1 500 ℃,misrun,cold shut and grain coarseness in the blades can be eliminated effectively.In addiiton,through modifying gating-riser system,shrinkage porosity in the blades can be avoided.

关 键 词：精密铸造 缩松 晶粒细化 涡轮叶片 

分 类 号：TG249.5[机械工程—精密仪器及机械]