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电子束冷床熔炼 TA2 钛合金铸坯缩孔及 凝固组织数值模拟
NumericalSimulationof the ShrinkagePorosityand SolidificationMicrostructure of TA2 TitaniumAlloy Ingots Preparedwith the EBCHM
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- DOI:
- 作者:
- 彭博 1，李阳 2，3，罗许 2，3，杨劼人 1
PENG Bo1,LI Yang2,3,LUO Xu2,3,YANG Jieren1
- 作者单位:
- 1. 四川大学 材料科学与工程学院，四川 成都 610065；2. 钒钛资源综合利用国家重点实验室，四川 攀枝花 617000；3. 攀 钢集团研究院有限公司，四川 攀枝花 617000
1. College of Materials Science and Engineering, Sichuan University, Chengdu 610065,China; 2. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000,China; 3. Pangang Group Research Institute Co., Ltd., Panzhihua 617000,China
- 关键词:
- 钛合金板材；连铸；凝固组织；数值模拟
titanium alloy sheet; continuous casting; casting microstructure; numerical simulation
- 摘要:
- 钛合金连铸技术对于实现高性能钛合金材料的高效、低成本制备，推动其在航空航天、医疗等高端领域的规模化应用具有重要意义。 为研究电子束连续熔凝工艺参数对钛合金铸坯凝固组织的影响，对 TA2 合金连铸过程中的温度场、流场以及凝固组织进行了数值仿真计算。 研究了钛液过热度和铸坯抽拉速率对连铸所得钛合金板材内部缩孔和凝固组织的影响。 结果表明，降低过热度和降低抽拉速率，导致晶粒细化；降低过热度和提高抽速率，使铸坯缩松缩孔缺陷增加，降低铸坯质量。当抽拉速率为 10 cm/min 时，缩孔体积分数为 2.01%。本研究表明，当抽拉速率为 5cm/min、过热度为 ~100 ℃时，可以同时获得晶粒细化、低缺陷的 TA2 合金连铸板材坯锭。Titanium alloy continuous casting technology is highly important for achieving efficient and low-cost production of high-performance titanium alloy materials and promoting their large-scale application in high-end fields such as aerospace, medical, and other advanced sectors. To investigate the effects of continuous electron beam melting and solidification process parameters on the solidification structure of titanium alloy ingots, numerical simulations were conducted for the temperature field, flow field, and solidification structure during the continuous casting process. The impacts of titanium liquid superheating and the casting withdrawal rate on the internal shrinkage porosity and solidification microstructure of continuously cast titanium alloy plates were investigated. The results indicate that reducing the degree of superheating and decreasing the withdrawal rate lead to grain refinement; reducing the degree of superheating and increasing the withdrawal rate causes an increase in shrinkage porosity defects in the ingot, thereby reducing the quality of the ingot. When the withdrawal rate is 10 cm/min, the volume fraction of shrinkage porosity is 2.01% . This study demonstrates that when the withdrawal rate is 5 cm/min and the superheating rate is approximately 100 ℃,it is possible to simultaneously achieve fine-grained, low-defect TA2 alloy continuous casting slab ingots.