In situ synchrotron diffraction study of a crack-free additively manufactured Ni base superalloy

SCRIPTA MATERIALIA

卷:200

Article

Prasad, Kartik¹  Horita, Yuuki¹  Ito, Atsushi¹  Torizuka, Shiro¹ 

[1] Univ Hyogo, Dept Mat & Synchrotron Radiat Engn, Himeji, Hyogo, Japan

关键词: Synchrotron radiation;    Plastic deformation;    Analytical methods;    Superalloy;    Additive manufacturing;   

DOI  :  10.1016/j.scriptamat.2021.113896

来源: Elsevier

【 摘 要 】

The tensile deformation behaviour of a crack-free additively manufactured (AM) Ni base superalloy and its wrought (W) counterpart has been investigated by in-situ synchrotron X-ray diffraction. In order to understand the evolution of dislocation character, dislocation density (rho), coherent scattering domain size (D) and dislocation arrangement parameter (M), the diffraction data corresponding to the first six{hkl} reflections have been analyzed using modified Williamson-Hall and modified Warren-Averbach methodologies. The rho was found to be relatively higher in AM superalloy as compared to W superalloy during both the regimes of elastic and plastic deformation. In the plastic deformation regime, while the fraction of edge and screw dislocations was found to be nearly equal in proportion in W superalloy, the fraction of screw dislocations remained higher in AM superalloy. In view of the relatively high initial rho and inefficacy of D in AM superalloy, heat treatment in as-built parts is suggested. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free