Microstructure and residual stress of laser rapid formed Inconel 718 nickel-base superalloy

Fencheng Liu, Xin Lin, Gaolin Yang, Menghua Song, Jing Chen, Weidong Huang

科研成果: 期刊稿件文章同行评审

309 引用 (Scopus)

摘要

The microstructure and residual stress of laser rapid formed (LRFed) nickel-base superalloy Inconel 718 was investigated. The as-deposited microstructure of an LRFed Inconel 718 alloy is composed of columnar dendrites growing epitaxially along the deposition direction, and the columnar dendrites transformed to unevenly distributed equiaxed grains after annealing treatment at high temperature. Residual stress evaluation in microstructure scale by Vickers micro-indentation method indicates that the residual thermal stress is unevenly distributed in the LRFed sample, and it has a significant effect on the recrystallization during solution annealing treatment. The residual stress is introduced by rapid heating and cooling during laser rapid forming. There is an alternative distribution between high residual stress regions and low residual stress regions, within a single deposited layer, resulting in a similar distribution of recrystallized grain size.

源语言英语
页(从-至)208-213
页数6
期刊Optics and Laser Technology
43
1
DOI
出版状态已出版 - 2月 2011

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