Alloying mechanics in moving melt pool during laser solid forming from blended elemental powders

Jing Chen, Fengying Zhang, Hua Tan, Xin Lin, Weidong Huang

科研成果: 期刊稿件文章同行评审

10 引用 (Scopus)

摘要

The laser solid forming (LSF) titanium alloys from blended elemental powders are investigated. By combining the computation of the melting time of powder particles with the motion analysis of the solid-liquid interface of the melt pool, the formation mechanism of the unmelted powder particles during LSF from blended elemental powders is disclosed. That the powder particles inject into the "unmelted zone" is the main reason leading to the formation of the unmelted particles. The morphologies of the unmelted particles are presented as "crescent" or sphere when the spherical elemental powder particles are used as the deposited materials. The theoretical analysis agrees well with the experimental results. The morphology and formation condition of the composition segregation band during LSF Ti-xAl-yV from blended elemental powders are investigated. It is found that the composition segregation band is prone to occur when the V content in the Ti-xAl-yV alloys is near or higher than the critical concentration of element V, and this is caused by the low melt flow velocity near the solid-liquid interface in the melt pool. The uniform composition in the alloying clad layers can be obtained by controlling the powder delivery parameters, powder characteristics, and the processing parameters.

源语言英语
页(从-至)2154-2159
页数6
期刊Zhongguo Jiguang/Chinese Journal of Lasers
37
8
DOI
出版状态已出版 - 8月 2010

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