论文部分内容阅读
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。
The hot cracking problem of K403 nickel base superalloy round flat castings was studied. The solidification process of the two riser designs was compared with ProCAST software and verified with the actual pouring test. The results show that the split riser design, riser and parts at the stress of 2.7h, the use of concentrated riser stress time is greater than 5h; Adopting four split riser design, riser and casting at the junction The maximum stress value is only 12 MPa, which is about 20% ~ 30% of the riser stress, which greatly reduces the hot cracking tendency. The results show that the use of split riser design and reduce the pouring temperature can avoid thermal cracking appear in line with the simulation results.