摘要
为进一步提升ZL114A合金铸造件的材料性能,采用Pro CAST模拟ZL114A合金定向凝固过程,研究了抽拉速度对合金铸件凝固过程中的温度场、糊状区和枝晶生长速率的影响规律。利用液态金属冷却(liquid metal coding,LMC)定向凝固法制备ZL114A合金棒料,分析实验结果,对比并验证了模型的准确性。结果表明:在抽拉速度为150μm/s时,LMC法能够得到较高的峰值温度梯度,获得较为理想的糊状区,从而保证了枝晶生长速率的稳定性。在此工艺条件下制备得到的ZL114A合金试棒,其微观凝固组织细化程度较高,显微缺陷较少,因此具备更好的材料性能。
In order to improve the material properties of ZL114 A alloy castings,ProCAST was used to simulate the directional solidification process of ZL114 A alloy. The influence of pulling rate on the temperature field,mushy zone,and dendrite growth rate during solidification of alloy castings was studied. The ZL114 A alloy bar was prepared by liquid metal cooling( LMC) directional solidification method. The experimental results were analyzed,and the accuracy of the model was verified. The results show that at the pulling rate of 150 μm/s,the LMC method can achieve a higher peak temperature gradient and can obtain a more ideal mushy zone,which can guarantee the stability of the dendrite growth rate. The ZL114 A alloy test rod prepared under this process condition has a higher degree of fine-grained microstructure and less micro-defects,it has better material properties.
作者
徐亚军
何涛
霍元明
赖磊捷
衣晓杰
XU Yajun;HE Tao;HUO Yuanming;LAI Leijie;YI Xiaojie(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《轻工机械》
CAS
2018年第6期57-61,共5页
Light Industry Machinery
基金
上海市科委地方能力建设重点项目(16030501200)
国家自然科学基金项目(51605275)
上海工程技术大学研究生科研创新项目(17KY0106)
