摘要
研究了K403镍基高温合金圆形平板铸件的热裂问题,用ProCAST软件对两种冒口设计工艺的凝固过程进行了对比分析,并与实际浇注试验进行了验证。结果表明,采用分体冒口设计,冒口与零件结合处产生应力的时间为2.7h,采用集中冒口产生应力时间大于5h;采用4个分体冒口设计,冒口与铸件结合处产生的最大应力值仅为12 MPa,是集中冒口应力的20%~30%,极大降低了热裂倾向。结果表明,采用分体冒口设计及降低浇注温度均能避免热裂出现,与模拟结果符合。
Different casting parameters were simulated by the ProCAST software in order to solve the hot tearing of circular plate castings of K403 nickel-based superalloy during solidification process.The simulation results were compared with the practical casting process.The analysis results show that the time of the stress generated from the juncture of top riser and casting reaches 2.7 hwith top riser and the divided parts,while the time of stress generation is more than 5 hwith the integral top riser.The maximum tensile stress of the juncture of top riser with four divided parts and casting reaches 12 MPa only,which is 20%~30% of that with the integral top riser,decreasing greatly tendency of hot tearing.In the practical process of casting,castings with four parts of top riser and lower pouring temperature are beneficial to reduce the hot tearing susceptibility of casting,which is accordant with the simulated ones.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2017年第11期1231-1234,共4页
Special Casting & Nonferrous Alloys
关键词
工艺参数
铸件
数值模拟
热裂
Casting Parameters, Castings, Numerical Simulation, Hot Tearing
