合金材料激光表面重熔快速凝固过程数值模拟

计算物理 ›› 1995, Vol. 12 ›› Issue (4): 535-540.

合金材料激光表面重熔快速凝固过程数值模拟

雷永平, 史耀武, 周家瑾

西安交通大学机械工程学院, 西安 710049

收稿日期:1994-06-16 修回日期:1995-03-06 出版日期:1995-12-25 发布日期:1995-12-25

NUMERICAL SIMULATION OF THE TRANSIENT SOLIDIFYING PROCESS FOLLOWING LASER SURFACE REMELTING

Let Yongping, Shi Yaowu, Zhou Jiajin

School of Mechanical Engineering Xi'an Jiaotong University, Xi'an 710049

Received:1994-06-16 Revised:1995-03-06 Online:1995-12-25 Published:1995-12-25

摘要/Abstract

摘要： 根据合金固液相变多区域性特点(液相区、固相区和糊状区共存),用数值方法求解了适合于多区域相变的单相统一控制方程组,并据此对lCr18NigTi不锈钢激光表面重熔熔池的快速凝固过程进行了理论分析。结果表明,凝固过程中液相线的推移速率大大固相线的推移速率,糊状区逐渐扩大;在凝固后期会出现糊状区与团相区共存阶段。

关键词: 激光重熔, 数值模拟, 凝固过程, 表面张力, 流场

Abstract: According to the multi-region features in alloy solidifying process,numerical simulation of rapid solidification following laser remelting is performed by using a one -phase continuum model based on the conservation of total mass, momentum and energy. The release of latent heat, the energy flux leaving the surface by radiation and natural convecton into the atmosphere are included. The finite difference method is used to solve the equations. The flow field and temperature distribution within the liquid pool during rapid solidifying process are studied for lCrl8Ni9Ti stainless steel. Results show that the moving speed of iiquidus line is greater than that of the solidus line during solidifying process, and at the end of solidification of the molten pool, there is a period of time during which the mushy region and solid region are coexist.

Key words: laser surface remelting, numerical simulation, solidification process, surface tension, fluid field

中图分类号:

O484
O242

雷永平, 史耀武, 周家瑾. 合金材料激光表面重熔快速凝固过程数值模拟[J]. 计算物理, 1995, 12(4): 535-540.

Let Yongping, Shi Yaowu, Zhou Jiajin. NUMERICAL SIMULATION OF THE TRANSIENT SOLIDIFYING PROCESS FOLLOWING LASER SURFACE REMELTING[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 1995, 12(4): 535-540.

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