Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 28    No. 8    August 2018

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Microstructural characterization of Inconel 718 alloy after pulsed laser surface treatment at different powers
Lin-jiang CHAI1, Shan-shan YUAN1, Wei-jiu HUANG1, Xu-sheng YANG1, Fang-jun WANG2, Dong-zhe WANG2, Jun-jun WANG1

1. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;
2. Chongqing Materials Research Institute Co., Ltd., Chongqing 400707, China

Abstract:An annealed Inconel 718 alloy was surface-treated by pulsed laser at three different powers (100, 50 and 25 W). Microstructural changes induced by the laser treatments were characterized by use of electron backscatter diffraction and electron channeling contrast imaging techniques. Results show that both annealing twins and strengthening precipitates profusely existing in the as-received specimen are dissolved at elevated temperatures during the laser irradiation. Meanwhile, in the melting zone (MZ), densities of low angle boundaries (LABs) are greatly increased with a large number of Laves phases preferentially distributed along such LABs. For different specimens, widths and depths of their MZs are found to be gradually reduced with decreasing the laser powers. Orientation analyses reveal that the columnar grains in the MZ of the 100 W specimen could inherit orientations existing in the matrix while lower laser powers promote the formation of more nuclei with scattered orientations to grow to be granular grains in the MZ. Hardness tests reveal that the MZs of all laser-treated specimens are softer than the matrix probably due to both precipitate dissolution and grain coarsening.

 

Key words: Inconel 718 alloy; grain boundaries; pulsed laser surface treatment; electron backscatter diffraction; hardness

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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