scholarly journals Effect of Ultrasonic Nano-Crystal Surface Modification (UNSM) on the Passivation Behavior of Aged 316L Stainless Steel

Materials ◽  
2017 ◽  
Vol 10 (7) ◽  
pp. 713 ◽  
Author(s):  
Ki-Tae Kim ◽  
Jung-Hee Lee ◽  
Young-Sik Kim
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
316L Stainless Steel ◽  
Crystal Surface ◽  
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.

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

Nanoscale surface modification of AISI 316L stainless steel by severe shot peening

2016 ◽  
Vol 102 ◽  
pp. 68-77 ◽  
Author(s):  
Sara Bagherifard ◽  
Sebastian Slawik ◽  
Inés Fernández-Pariente ◽  
Christoph Pauly ◽  
Frank Mücklich ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
Shot Peening ◽  
316L Stainless Steel ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Severe Shot Peening

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.

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