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Materials and Manufacturing Processes Volume 30, 2015 - Issue 2
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Original Articles

Effect of Ultrasonic Nanocrytalline Surface Modification on the Microstructural Evolution of Inconel 690 Alloy

Kejian LiSchool of Nano & Advanced Materials Engineering, Changwon National University, Changwon, Korea
,
Yinsheng HeSchool of Nano & Advanced Materials Engineering, Changwon National University, Changwon, Korea
,
In Shik ChoDepartment of Hybrid Engineering, Sunmoon University, Asan, Korea
,
Chang Soon LeeDepartment of Hybrid Engineering, Sunmoon University, Asan, Korea
,
In Gyu ParkDepartment of Hybrid Engineering, Sunmoon University, Asan, Korea
,
Jung-il SongDepartment of Mechanical Engineering, Changwon National University, Changwon, Korea
,
Cheol-Woong YangSchool of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon, Korea
,
Je-Hyun LeeSchool of Nano & Advanced Materials Engineering, Changwon National University, Changwon, Korea
&
Keesam ShinSchool of Nano & Advanced Materials Engineering, Changwon National University, Changwon, KoreaCorrespondence[email protected]
 show all
Pages 194-198 | Received 22 Oct 2013, Accepted 08 Apr 2014, Published online: 22 Dec 2014
 
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Abstract

Specimens of Inconel 690 were investigated after ultrasonic nanocrystalline surface modification (UNSM) using microhardness tests, electron backscattered diffraction, and transmission electron microscopy (TEM). After UNSM treatment, a 60% increase of hardness up to ∼310 µm in depth was observed. Layer-by-layer TEM analysis showed well-refined grains and twins in addition to the high dislocations density. The mechanism of the microstructure refinement was attributed to the development of nano-grains, twin structures, and dislocations.

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