Zr65Al7.5Ni10Cu17.5非晶合金激光熔凝的热效应模拟  

Simulation of thermal effect of Zr65Al7.5Ni10Cu17.5 amorphous alloy by laser melting

作　　者：陈星 葛亚琼[1] CHEN Xing;GE Yaqiong(College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学材料科学与工程学院,太原030024

出　　处：《激光技术》2020年第2期202-205,共4页Laser Technology

基　　金：国家自然科学基金资助项目(51405324);山西省自然科学基金面上青年基金资助项目(201701D221068);太原科技大学博士科研启动基金资助项目(20152010);山西省重点学科建设经费资助项目;山西省互联网+3D打印协同创新中心资助项目。

摘　　要：为了研究激光增材制备非晶合金过程中熔池和热影响区的成形机制,利用有限元软件ANSYS,对激光增材制造技术的基础过程-激光快速熔凝Zr65Al7.5Ni10Cu17.5非晶合金的热效应进行了数值模拟分析。结果表明,激光单点熔凝时,熔池的平均冷却速率为6.3×10^4K/s,热影响区的平均冷却速率为1.4×10^4K/s,远高于Zr65Al7.5Ni10Cu17.5非晶合金的临界冷却速率1.5K/s,说明激光单点熔凝的热变化满足非晶合金的生长条件;激光单道熔凝过程中,熔池的平均冷却速率仍比较高,为2.11×10^2K/s,但热影响区的平均冷却速率较低,为74K/s,且热影响区会产生弛豫累积,可能造成一定程度的晶化。此研究为激光增材制备非晶合金材料提供热效应的理论基础。In order to study the forming mechanism of molten pool and heat-affected zone in the preparation of amorphous alloys by laser additive manufacturing,finite element software ANSYS was used.The thermal effect of laser rapid melting Zr65Al7.5Ni10Cu17.5 amorphous alloy was numerically simulated and analyzed.The simulation results show that,average cooling rate of molten pool is 6.3×10^4K/s when laser solidification is carried out at single point.Average cooling rate in heat affected zone is 1.4×10^4K/s,much higher than 1.5K/s of critical cooling rate of Zr65Al7.5Ni10Cu17.5 amorphous alloy.The thermal change of single-point laser melting meets the growth conditions of amorphous alloys.In the process of single-channel laser melting,average cooling rate of molten pool is 2.11×10^2K/s,still relatively high.However,average cooling rate of heat affected zone is 74K/s and low.In addition,relaxation accumulation occurs in the heat-affected zone.It may cause a certain degree of crystallization.This study provides theoretical basis for thermal effect of amorphous alloys prepared by laser additive manufacturing.

关 键 词：激光技术 非晶合金 数值模拟 热效应 晶化行为 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]