scholarly journals Method of ultrasonic nano-crystal surface modification for improvement of surface characteristics of AISI D2 heat-treated with different tempering conditions

2022 ◽  
Author(s):  
Seung Yeong Cho ◽  
Do Sik Shim
Keyword(s):  
Surface Modification ◽  
Crystal Surface ◽  
Surface Characteristics ◽  
Heat Treated ◽  
Aisi D2 ◽  
Nano Crystal

Improving surface finish and wear resistance of additive manufactured nickel-titanium by ultrasonic nano-crystal surface modification

2017 ◽  
Vol 249 ◽  
pp. 433-440 ◽  
Author(s):  
Chi Ma ◽  
Mohsen Taheri Andani ◽  
Haifeng Qin ◽  
Narges Shayesteh Moghaddam ◽  
Hamdy Ibrahim ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Surface Finish ◽  
Crystal Surface ◽  
Nickel Titanium ◽  
Nano Crystal

Increasing the Fracture Strength and Strain of Bulk Metallic Glasses by Ultrasonic Nano-Crystal Surface Modification

2016 ◽  
Author(s):  
Chi Ma ◽  
Yalin Dong ◽  
Chang Ye
Keyword(s):  
Surface Modification ◽  
Fracture Strength ◽  
Metallic Glasses ◽  
Crystal Surface ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Localized Deformation ◽  
Untreated Sample ◽  
Nano Crystal ◽  
Surface Technique

A novel surface technique, ultrasonic nano-crystal surface modification (UNSM), was used to process BMGs (Bulk Metallic Glasses) to improve the fracture strength and strain. It has been found that the fracture strength and strain are increased by 14.6% and 15.3% respectively after UNSM. In addition, micro-defects (voids and cracks) are found at the surface layer of UNSM-treated specimen after fracture, while there are fewer micro-defects observed in the untreated sample. We attribute the improvement of fracture stress and strain to two mechanisms. First, the excess free volume generated in BMGs by UNSM helps the nucleation of shear bands and the redistribution of the localized deformation. Second, the compressive residual stress generate by UNSM can slow down crack propagation. Both mechanisms lead to the improvement of BMGs fracture strength and strain.

A Study on the Ultrasonic Nano Crystal Surface Modification(UNSM) Technology and It's Application

2009 ◽  
Vol 33 (3) ◽  
pp. 190-195 ◽  
Author(s):  
Young-Sik Pyoun ◽  
Jeong-Hyeon Park ◽  
In-Ho Cho ◽  
Chang-Sik Kim ◽  
Chang-Min Suh
Keyword(s):  
Surface Modification ◽  
Crystal Surface ◽  
Nano Crystal

Surface nanocrystallization by ultrasonic nano-crystal surface modification and its effect on gas nitriding of Ti6Al4V alloy

2018 ◽  
Vol 736 ◽  
pp. 335-343 ◽  
Author(s):  
Jun Liu ◽  
Sergey Suslov ◽  
Azhar Vellore ◽  
Zhencheng Ren ◽  
Auezhan Amanov ◽  
...  
Keyword(s):  
Surface Modification ◽  
Crystal Surface ◽  
Ti6al4v Alloy ◽  
Surface Nanocrystallization ◽  
Gas Nitriding ◽  
Nano Crystal

Effects of Ultrasonic Nano-Crystal Surface Modification on the Microstructure and Properties of 304 Austenitic Stainless Steel

2014 ◽  
Author(s):  
Chang Ye ◽  
Abhishek Telang ◽  
Amrinder S. Gill ◽  
Sergey Suslov ◽  
Zhong Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Surface Modification ◽  
Austenitic Stainless Steel ◽  
Crystal Surface ◽  
Processing Technique ◽  
304 Austenitic Stainless Steel ◽  
And Performance ◽  
Austenitic Stainless Steel 304 ◽  
Nano Crystal

In this study, the effects of Ultrasonic Nano-crystal Surface Modification (UNSM) on the microstructure changes and the mechanical properties of austenitic stainless steel 304 were studied. Due to the dynamic impacts induced by the multiple strikes during UNSM, surface nanocrystallization and transformation to martensite has been achieved. The work-hardened surface layers (3.5 times the original hardness) lead to significant improvement in the mechanical properties as measured by nano-indentation and tensile test. The results demonstrate that UNSM is a powerful surface processing technique that can improve component mechanical properties and performance.

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