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Selective laser melting manufactured CNTs/AZ31B composites: Heat transfer and vaporized porosity evolution

Published online by Cambridge University Press:  23 July 2018

Jiaojiao Wu  and
Linzhi Wang
Jiaojiao Wu
Affiliation:
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; and Chongqing Key Laboratory of Additive Manufacturing Technology and Systems, Chongqing 400714, China
Linzhi Wang*
Affiliation:
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; and Chongqing Key Laboratory of Additive Manufacturing Technology and Systems, Chongqing 400714, China
*
a)Address all correspondence to this author. e-mail: wlz@cigit.ac.cn
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Abstract

In this research, heat transfer analysis was operated by simulation to investigate the influence of carbon nanotubes (CNTs) on laser absorption and molten pool characteristic as well as the vaporization porosity of a typical magnesium alloy of AZ31B in the selective laser melting (SLM) process. It is concluded that the laser absorption is enhanced by 7.9% through mixing 1.5 wt% CNTs into AZ31B alloy powders. The full melting state of molten pools for CNTs/AZ31B composites was achieved by laser input energy densities (LIEDs) larger than 42 J/mm3. However, vaporization porosity has an ascendent tendency with LIED increasing, which leads to poor densities of manufactured parts. As a result, the optimal relative density and mechanical properties of composites are obtained by an LIED of 42 J/mm3. It may solve the problem of low laser absorption in laser processing for magnesium alloys and provide a referenced method to evaluate the vaporization porosity of the material in the SLM process.

Keywords

compositelaserMg
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 18 , 28 September 2018 , pp. 2752 - 2762
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

b)

These authors contributed equally to this work.

References

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