摘要
应用ProCAST软件对Fe-Cr-Ni合金轴套的熔模铸造过程进行了数值模拟与分析,主要包括充型过程,凝固时间、缩孔、缩松的形成过程和应力场。模拟结果预测了轴套中存在的热裂缺陷,与实际生产情况基本符合。分析结果表明,轴套铸件产生热裂纹的主要原因是在凝固过程中冒口圈与铸件之间产生了缩松、缩孔,该缺陷的产生使得此部位的强度降低,合金收缩时该部位的拉应力大于其强度极限,因此容易产生裂纹。采取扩大横浇道截面的方法,使得铸件有足够的补缩量,通过生产得到了合格的铸件。
The investment casting process including filling process,solidification time,shrinkage porosity formation and stress field,of a Fe-Cr-Ni alloy sleeve was simulated and analyzed by ProCAST software.The hot tearing defect was predicted,and the simulated results were well in agreement with the practical product.The analysis results reveal that the hot tearing of the sleeve is attributed to the shrinkage porosity occurred between the riser ring and the casting during solidification process resulting in the decrease of strength.When the tensile stress is more than the ultimate strength,hot tearing is generated.Through expending the section of the runner cross-gate to take enough feeding for the castings,the qualified castings were produced successfully.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2015年第12期1286-1289,共4页
Special Casting & Nonferrous Alloys
