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Gradient nanostructure and residual stresses induced by Ultrasonic Nano-crystal Surface Modification in 304 austenitic stainless steel for high strength and high ductility

Ye, Chang ; Telang, Abhishek ; Gill, Amrinder S. ; Suslov, Sergey ; Idell, Yaakov ; Zweiacker, Kai ; Wiezorek, Jörg M.K. ; Zhou, Zhong ; Qian, Dong ; Mannava, Seetha Ramaiah ; Vasudevan, Vijay K.

Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2014-09, Vol.613 (C), p.274-288 [Periódico revisado por pares]

Kidlington: Elsevier B.V

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Título:
Gradient nanostructure and residual stresses induced by Ultrasonic Nano-crystal Surface Modification in 304 austenitic stainless steel for high strength and high ductility
Autor: Ye, Chang ; Telang, Abhishek ; Gill, Amrinder S. ; Suslov, Sergey ; Idell, Yaakov ; Zweiacker, Kai ; Wiezorek, Jörg M.K. ; Zhou, Zhong ; Qian, Dong ; Mannava, Seetha Ramaiah ; Vasudevan, Vijay K.
Assuntos: Applied sciences ; Austenitic stainless steels ; Cross-disciplinary physics: materials science; rheology ; Deformation ; Deformation twins ; Dislocations ; Exact sciences and technology ; Fatigue ; Fatigue performance ; Gradient microstructure ; Hardness ; Martensitic transformations ; Materials science ; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology ; Metals. Metallurgy ; Microstructure ; Nanocrystals ; Nanostructure ; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations ; Physics ; Precession electron diffraction (PED) ; Production techniques ; Residual stress ; Residual stresses ; Surface layer ; Surface treatment ; Ultrasonic Nano-crystal Surface Modification (UNSM)
É parte de: Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2014-09, Vol.613 (C), p.274-288
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
USDOE
102835; AC07-05ID14517
Descrição: In this study, the effects of Ultrasonic Nano-crystal Surface Modification (UNSM) on residual stresses, microstructure changes and mechanical properties of austenitic stainless steel 304 were investigated. The dynamic impacts induced by UNSM leads to surface nanocrystallization, martensite formation, and the generation of high magnitude of surface compressive residual stresses (−1400MPa) and hardening. Highly dense deformation twins were generated in material subsurface to a depth of 100µm. These deformation twins significantly improve material work-hardening capacity by acting both as dislocation blockers and dislocation emission sources. Furthermore, the gradually changing martensite volume fraction ensures strong interfacial strength between the ductile interior and the two nanocrystalline surface layers and thus prevents early necking. The microstructure with two strong surface layers and a compliant interior embedded with dense nanoscale deformation twins and dislocations leads to both high strength and high ductility. The work-hardened surface layers (3.5 times the original hardness) and high magnitude of compressive residual stresses lead to significant improvement in fatigue performance; the fatigue endurance limit was increased by 100MPa. The results have demonstrated that UNSM is a powerful surface engineering technique that can improve component mechanical properties and performance.
Editor: Kidlington: Elsevier B.V
Idioma: Inglês

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Gradient nanostructure and residual stresses induced by Ultrasonic Nano-crystal Surface Modification in 304 austenitic stainless steel for high strength and high ductility

Ye, Chang ; Telang, Abhishek ; Gill, Amrinder S. ; Suslov, Sergey ; Idell, Yaakov ; Zweiacker, Kai ; Wiezorek, Jörg M.K. ; Zhou, Zhong ; Qian, Dong ; Mannava, Seetha Ramaiah ; Vasudevan, Vijay K.

Kidlington: Elsevier B.V

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