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]

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

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

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