激光重熔熔池凝固组织的实时观察研究
王理林, 男, 1982年生, 博士
修回日期: 2014-09-25
网络出版日期: 2015-05-01
基金资助
* 国家自然科学基金项目51271213和51323008, 国家重点基础研究发展计划项目2011CB610402, 中国博士后科学基金项目2013M542384以及高等学校博士学科点专项科研基金项目20116102110016资助
REAL-TIME OBSERVATION OF SOLIDIFICATION MICROSTRUCTURE IN LASER REMELTING POOL
Revised date: 2014-09-25
Online published: 2015-05-01
Supported by
Supported by National Natural Science Foundation of China (Nos.51271213 and 51323008), National Basic Research Program of China (No.2011CB610402), China Postdoctoral Science Foundation (No.2013M542384) and Specialized Research Fund for the Doctoral Program of Higher Education (No.20116102110016)
采用透明模型合金丁二腈-2.0% (质量分数)乙醇(SCN-2.0%Eth), 实时观察了在单晶基材(001)晶面上进行激光重熔时, 扫描方向偏离基材[100]晶向不同角度时熔池内枝晶生长的演化过程. 研究发现, 当沿平行[100]晶向的方向进行扫描时, 熔池最后演变为[010]枝晶列和
王理林 , 林鑫 , 王永辉 , 宇红雷 , 黄卫东 . 激光重熔熔池凝固组织的实时观察研究[J]. 金属学报, 2015 , 51(4) : 492 -498 . DOI: 10.11900/0412.1961.2014.00527
The final quality of parts fabricated by high energy beam (laser, electron beam and arc) processing technology is determined by solidification microstructure formation in the molten pool, which attracts lot of attention of researches. However, real-time observation of solidification microstructure formation in the molten metal pool is very difficult because of its high temperature, rapid solidification and opacity. In this work, using a transparent model alloy of succinonitrile-2.0% (mass fraction) ethanol (SCN-2.0%Eth), the solidification microstructure evolution in the molten pool during laser surface remelting (001) crystal plane of a single-crystal substrate was real-time observed as the laser scanning direction deviated different angles from [100] crystal orientation of the substrate. It was found that and dendritic columns grow symmetrically in the molten pool when the scanning direction parallels to the [100] crystal direction. Dendritic columns grow asymmetrically in the molten pool when the scanning direction deviates an angle of 20° from the [100] crystal orientation. Specifically, dendritic columns always grow at one side of the molten pool while [100] and [010] dendritic columns compete to grow alternately at the other side. [100] and dendritic columns grow perpendicular to each other in the molten pool when the scanning direction deviates an angle of 45° from the [100] crystal orientation. According to the preferential growth criterion of dendrite, a model describing the dendritic growth behavior in laser remelting pool was established. It can explain the experimental results well. The results showed that the solidification microstructure formation in laser remelting pool is influenced by both pool morphology and crystal orientation of the substrate.
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