Properties of Metallic Materials after Surface Self Nano-Crystallization

2014 ◽  
Vol 941-944 ◽  
pp. 416-420 ◽  
Author(s):  
Guang Yu Pei ◽  
Dong Li ◽  
Kai Bin Li
Keyword(s):  
Plastic Deformation ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Surface Layer ◽  
Severe Plastic Deformation ◽  
Compressive Stress ◽  
High Strength ◽  
Metallic Materials ◽  
Diffusion Property ◽  
Surface Nanocrystallization

Surface Self-nanocrystallization (SSNC) can produce nanometer grains (10~50μm depth) in the surface layer of metallic materials. And high strength, residual compressive stress as well as a mass of defects attributed to grain refinement and severe plastic deformation, greatly improve their surface properties, such as strength, wear resistance, diffusion property, fatigue performance and corrosion resistance. Now some methods have been confirmed which could realize surface nanocrystallization. This paper reviews the study of surface nanocrystallization and simply summarizes changes in their performance based on surface layer microstructure of metallic materials.

Aging Behaviour of Aluminium Alloys after Severe Plastic Deformation

2006 ◽  
Vol 519-521 ◽  
pp. 1485-1492 ◽  
Author(s):  
Z. Horita
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
High Strength ◽  
Age Hardening ◽  
Precipitation Process ◽  
Al Alloy ◽  
Metallic Materials ◽  
Aging Behavior ◽  
Angular Pressing ◽  
Transmission Electron

The process of severe plastic deformation (SPD) makes it possible to reduce the grain size to the submicrometer or nanometer range in many metallic materials. When the SPD process is applied to age hardenable alloys, it may also be possible to control aging behavior. In this study, a technique of equal-channel angular pressing (ECAP) is used as an SPD process and aging behavior is examined on the three selected Al alloy systems such as Al-Ag, Al-Mg-Si and Al-Si-Ge. The microstructures are observed using transmission electron microscopy and the mechanical properties including hardness are measured. It is shown that the SPD process introduces unusual phenomena in the precipitation process and there should be a potential for enhancement of strength over the conventional age-hardening process or for improvement of ductility while keeping the high strength.

Surface Nanocrystallization of Low Carbon Steel Induced by Circulation Rolling Plastic Deformation

2005 ◽  
Vol 475-479 ◽  
pp. 133-136 ◽  
Author(s):  
Xin Min Fan ◽  
Bosen Zhou ◽  
Lin Zhu ◽  
Heng Zhi Wang ◽  
Jie Wen Huang
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Surface Layer ◽  
Carbon Steel ◽  
Severe Plastic Deformation ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Surface Nanocrystallization ◽  
Average Grain Size ◽  
The Matrix

In this paper, the circulation rolling plastic deformation(CRPD) surface nanocrystallization technology is proposed based on the idea that the severe plastic deformation can induce grain refinement. The equipment of CRPD is designed and manufactured. A nanocrystallization surface layer was successfully obtained in a column sample of low carbon steel. The average grain size in the top surface layer is about 18 nm, and gradually increases with the distance from the surface. The hardness increases gradually from about 200HV0.1 in the matrix to about 600HV0.1 in the surface layer.

Enhancement of Reliability of Machines and Materials by Friction Plating

2008 ◽  
Vol 59 ◽  
pp. 46-50
Author(s):  
L. Belevskiy ◽  
Vladimir A. Popov ◽  
S.A. Tulupov ◽  
Oleg M. Smirnov
Keyword(s):  
Plastic Deformation ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Surface Layer ◽  
High Temperature ◽  
High Speed ◽  
Protective Coatings ◽  
Coating Material ◽  
Strong Adhesion ◽  
Modification Of The Surface

A process of friction plating was developed for modification of the surface of metal items by strain hardening combined with application of protective coatings aimed to improve corrosion resistance, hardness, wear resistance and other functional properties. Friction plating is performed by means of a metal wire brush rotating at high speed. Coating material in the form of a rod or strip is pressed with a certain force to the rotary wire brush. In the contact zone, coating material is heated up to a high temperature. Particles of coating material are picked up by the ends of brush wires and transferred onto the treated surface. At the same time, the surface of the product is conditioned and heated. Investigations of friction plating have shown that plastic deformation of the surface layer combined with application of coating material particles ensures their strong adhesion to the substrate.

Study on Processing Parameters of Supersonic Particles Bombarding Treatment

2013 ◽  
Vol 774-776 ◽  
pp. 1204-1207
Author(s):  
Yu Liang Liu ◽  
Tian Ying Xiong
Keyword(s):  
Plastic Deformation ◽  
Weight Loss ◽  
Surface Layer ◽  
Severe Plastic Deformation ◽  
Orthogonal Design ◽  
Processing Parameters ◽  
Metallic Materials ◽  
Nanostructured Surface ◽  
Orthogonal Experiments ◽  
Treated Sample

Supersonic Particles Bombarding (SSPB) can introduce severe plastic deformation on the surface of metallic materials, and nanostructured surface layer can be fabricated on the materails. So SSPB is a promosing technology which can be applied in industry. Main parameters of SSPB were optimized by orthogonal design, and their effect on the weight loss of the SSPB treated sample was analysed. Optimized parameters were obtained after the orthogonal experiments.

Strain Compatibility and Nanostructuring of Bulk Metallic Materials via Severe Plastic Deformation

2010 ◽  
Vol 667-669 ◽  
pp. 45-49
Author(s):  
Farid Z. Utyashev
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Elevated Temperatures ◽  
High Strength ◽  
Deformation Mode ◽  
Point Of View ◽  
Metallic Materials ◽  
Strain Compatibility ◽  
Structural Applications ◽  
Superplastic Properties

Nanostructured (NS) metallic materials can exhibit high strength at room temperature and superplastic properties at elevated temperatures. This enables to enhance their technological and structural properties, when producing various parts from them. For producing NS materials by severe plastic deformation (SPD), the development of effective SPD techniques for practical use is an urgent task. It is shown that solution of such a task should take into account strain compatibility on the macro-, meso- and micro-levels. Not only shear but also rotational deformation mode should be considered. Properties of NS materials and possibilities of their structural applications are considered from this point of view.

scholarly journals The Characteristics of Creep in Metallic Materials Processed by Severe Plastic Deformation

2019 ◽  
Vol 60 (8) ◽  
pp. 1506-1517 ◽  
Author(s):  
Petr Kral ◽  
Jiri Dvorak ◽  
Vaclav Sklenicka ◽  
Terence G. Langdon
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Metallic Materials
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