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Laser solid forming assisted by friction stir processing for preparation of Ni–16Cr–8Fe alloys: Crack repairing and grain refinement

Published online by Cambridge University Press:  27 June 2018

Pengda Niu ,
Ruidi Li ,
Tiechui Yuan ,
Minbo Wang ,
Siyao Xie  and
Hong Wu
Pengda Niu
Affiliation:
State Key Laboratory of Powder Metallurgy, Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, People’s Republic of China
Ruidi Li*
Affiliation:
State Key Laboratory of Powder Metallurgy, Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, People’s Republic of China
Tiechui Yuan*
Affiliation:
State Key Laboratory of Powder Metallurgy, Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, People’s Republic of China
Minbo Wang
Affiliation:
State Key Laboratory of Powder Metallurgy, Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, People’s Republic of China
Siyao Xie
Affiliation:
State Key Laboratory of Powder Metallurgy, Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, People’s Republic of China
Hong Wu
Affiliation:
State Key Laboratory of Powder Metallurgy, Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: liruidi@csu.edu.cn
b)e-mail: tiechuiyuan@csu.edu.cn
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Abstract

Although laser solid forming (LSF) has a wide range of applications in material manufacturing, the technique has been severely limited due to the solidification cracks during rapid laser melting/solidification. In this paper, an LSF technology assisted by friction stir processing (FSP) is proposed to eliminate the LSF crack through the FSP thermomechanical coupling effect, with the Ni–16Cr–8Fe alloy as a representative material. By FSP-assisted LSF, the cracks at the top surface of the Ni–16Cr–8Fe alloy layer were eliminated. Meanwhile, the severe plastic deformation layers can be observed and gradient grains with tens of nanometers to tens of micrometers from the top surface to the inner. The LSF-printed dendrite microstructure was transformed into nanocrystals or nanotwins in the deformation zone with twining as the main deformation mechanism. The grain refinement results in the increase of hardness about 30%.

Keywords

laser solid formingfriction stir processingmicrostructural evolution
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3521 - 3529
Copyright
Copyright © Materials Research Society 2018 

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