Surface Modification of Magnesium Alloy by Shot Lining and Laser Heating

2016 ◽  
Vol 879 ◽  
pp. 703-708
Author(s):  
Yasunori Harada ◽  
Minoru Matsumoto ◽  
Masayuki Nunobiki ◽  
Katsuhiko Takahashi
Keyword(s):  
Magnesium Alloy ◽  
Shot Peening ◽  
Cast Steel ◽  
Hardness Test ◽  
Aluminum Foil ◽  
Surface Characteristics ◽  
Heat Treated ◽  
Wide Range ◽  
Type Machine ◽  
High And Low Temperatures

Magnesium alloy has a wide range of application prospects in the automobile and electronic industries. However, peeling of the coating material may occur under harsh environments such as high and low temperatures and high humidity with the conventional coating techniques. The authors have proposed a lining process of metals with thin aluminium foils using shot peening. In this method, the foil can be bonded to the workpiece surface bringing about large plastic deformation. The pressure generated by the hit of many shots is utilized for the bonding. In the present study, to improve the surface characteristics of magnesium alloy, the formation of an Fe-Al intermetallic compound film on magnesium alloy by compound treatment combining shot lining method and heat treatment was mainly investigated. Shot peening was performed with a centrifugal-type machine using cast steel ball. The lined sheet is aluminum foil with pure iron powders, and the workpiece was the commercial magnesium alloys. The lined workpieces are heat treated by laser in air. The Vickers hardness test was performed with a microhardness tester. It was confirmed that the present method could be used for the formation of functional films on the magnesium alloy.

Effect of Heating and Subsequent Re-Shot Peening on Surface Characteristics of Shot-Peened Carbon Steel

2011 ◽  
Vol 325 ◽  
pp. 739-744 ◽  
Author(s):  
Yasunori Harada
Keyword(s):  
Carbon Steel ◽  
Shot Peening ◽  
Cast Steel ◽  
Surface Hardness ◽  
Surface Characteristics ◽  
Heat Treated ◽  
Processing History ◽  
History Of ◽  
Type Machine ◽  
Steel Balls

The shot peening process is one of the surface treatments. In this process the peening effects are characterized by the fact that the surface layer undergoes large plastic deformation due to the collision of shots. The effects are greatly influenced by the processing history or the thermal history of material. Little is known about the relation between hardness of the shot peened surface and the processing history of materials. In the present study, the effect of heating and subsequent re-shot peening on the surface characteristics of the shot-peened carbon steel was investigated. Shot peening was performed with an air-type machine using cast steel balls. Hardness and compressive residual stress in the re-shot peened workpieces were measured. When the heat treated workpiece was re-processed by shot peening, surface hardness and fatigue life of carbon steel were improved. It was found that the surface characteristics of the peened carbon steel were improved by heating and subsequent re-shot peening.

Effect of Microshot Peening on Surface Characteristics of Spring Steel

2010 ◽  
Vol 654-656 ◽  
pp. 374-377
Author(s):  
Yasunori Harada ◽  
Koji Yoshida
Keyword(s):  
Residual Stress ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Cast Steel ◽  
High Hardness ◽  
Surface Characteristics ◽  
Spring Steel ◽  
Cemented Carbide ◽  
High Carbon ◽  
New Type

Shot peening is a surface treatment that improves the performance of engineering components. In conventional shot peening, the medium consists of small spheres, which are usually made of high-carbon cast steel; the diameter of the spheres is in the range from 0.3 to 1.2mm. More recently, however, a new type of microshot has been developed to enhance the peening effect. The diameter of the spheres in the new medium is in the range from 0.02 to 0.15mm. In the present study, the effect of microshot peening on the surface characteristics of spring steel was investigated. The injection method of the microshot was of the compressed air type. The microshots of 0.1mm diameter were high-carbon cast steel and cemented carbide, and the workpiece used was the commercially spring steel JIS-SUP10. The surface roughness, hardness and compressive residual stress of the peened workpieces were measured. The surface layer of the workpieces was sufficiently deformed by microshot peening. A high hardness or residual stress was observed near the surface. The use of hard microshots such as cemented carbide was found to cause a significantly enhanced peening effect for spring steel.

scholarly journals Surface Characteristics and High Cycle Fatigue Performance of Shot Peened Magnesium Alloy ZK60

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Jie Dong ◽  
Wencai Liu ◽  
Wenjiang Ding ◽  
Jianxin Zou
Keyword(s):  
Magnesium Alloy ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Crack Nucleation ◽  
Surface Characteristics ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Fatigue Crack Nucleation ◽  
Zk60 Alloy ◽  
Zk60 Magnesium Alloy

The current work investigated the effect of shot peening (SP) on high cycle fatigue (HCF) behavior of the hot-extruded ZK60 magnesium alloy. SP can significantly improve the fatigue life of the ZK60 alloy. After SP at the optimum Almen intensities, the fatigue strength at 107 cycles in the as-extruded (referred to as ZK60) and the T5 aging-treated (referred to as ZK60-T5) alloys increased from 140 and 150 MPa to 180 and 195 MPa, respectively. SP led to a subsurface fatigue crack nucleation in both ZK60 and ZK60-T5 alloys. The mechanism by which the compressive residual stress induced by shot peening results in the improvement of fatigue performance for ZK60 and ZK60-T5 alloys was discussed.

Effect of Microshot Peening on Fatigue Strength of Austenite Stainless Steel

2021 ◽  
Vol 1016 ◽  
pp. 145-150
Author(s):  
Yasunori Harada ◽  
Katsuhiko Takahashi
Keyword(s):  
Stainless Steel ◽  
Fatigue Strength ◽  
Cast Steel ◽  
Surface Characteristics ◽  
Average Diameter ◽  
Hardened Layer ◽  
Material Surface ◽  
Workpiece Surface ◽  
The Media ◽  
Type Machine

The effects of the peening conditions on the surface characteristics and fatigue strength of stainless steel were investigated by microshot peening (MSP). In recent years, MSP technology has attracted attention. The use of MSP technology with minute media has become more widespread in consideration of the reduction of the notch effect in the material surface. However, the effect of MSP technology on stainless steel has not been much studied. In the present study, an air-type machine was used. The media used was high-carbon cast steel (490 HV) and Fe-Cr-B alloy (1130 HV), with an average diameter of 0.1 mm. The peening time was in the range of 0 - 100 s. Four types of stainless steels, SUS304, SUS304L, SUS316, and SUS316L, were tested. The workpieces were annealed at 1100 K for 1.2 ks in air. In the measurement of fatigue strength, the workpieces were machined in hour-glass shape. As the results, surface roughness of the workpieces treated by MSP was small. Work hardening was evident to the depth of approximately 0.2 mm from the surface. This depth was about twice the diameter of shot media. However, the effect of the peening time on the hardness distribution was not large. The compressive residual stress was added in the surface vicinity. It is assumed that the fatigue limit had increased because the work hardened layer was formed near the workpiece surface.

Development of PEF extraction technology by Maguin

2015 ◽  
pp. 758-760
Author(s):  
Romain Delecourt ◽  
Loïc Marsal
Keyword(s):  
Sugar Beet ◽  
Electric Field ◽  
Pulsed Electric Field ◽  
Extraction Technology ◽  
Application System ◽  
Wide Range ◽  
Type Machine

Maguin (France) is still active in the application of pulsed electric field (PEF) technology. After having carried out successful tests on a 10 t/h pilot screw-type machine on sugar beet cossettes, a new application system based on a roller technology has been developed. This technology allows a wide range of application due to its flexibility with flowrates and materials. A variety of process schemes are proposed to ensure the best performance of the PEF technology.

scholarly journals Effect of Shot Peening on Bending Strength of Magnesium Alloy Pipe

2015 ◽  
Vol 56 (649) ◽  
pp. 139-145 ◽  
Author(s):  
Yasunori HARADA ◽  
Izumi FUKUDA ◽  
Atsushi YAMAMOTO
Keyword(s):  
Magnesium Alloy ◽  
Shot Peening ◽  
Bending Strength

scholarly journals Water Filtration Membranes Based on Non-Woven Cellulose Fabrics: Effect of Nanopolysaccharide Coatings on Selective Particle Rejection, Antifouling, and Antibacterial Properties

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1752
Author(s):  
Blanca Jalvo ◽  
Andrea Aguilar-Sanchez ◽  
Maria-Ximena Ruiz-Caldas ◽  
Aji P. Mathew
Keyword(s):  
Cellulose Nanofibers ◽  
Antibacterial Properties ◽  
Surface Characteristics ◽  
Water Filtration ◽  
Separation Performance ◽  
Nonwoven Fabrics ◽  
Filtration Membranes ◽  
Wide Range ◽  
Dry Conditions ◽  
Cellulose Fabrics

This article presents a comparative study of the surface characteristics and water purification performance of commercially available cellulose nonwoven fabrics modified, via cast coating, with different nano-dimensioned bio-based carbohydrate polymers, viz. cellulose nanocrystals (CNC), TEMPO-oxidized cellulose nanofibers (T-CNF), and chitin nanocrystals (ChNC). The surface-modified nonwoven fabrics showed an improvement in wettability, surface charge modification, and a slight decrease of maximum pore size. The modification improved the water permeance in most of the cases, enhanced the particle separation performance in a wide range of sizes, upgraded the mechanical properties in dry conditions, and showed abiotic antifouling capability against proteins. In addition, T-CNF and ChNC coatings proved to be harmful to the bacteria colonizing on the membranes. This simple surface impregnation approach based on green nanotechnology resulted in highly efficient and fully bio-based high-flux water filtration membranes based on commercially available nonwoven fabrics, with distinct performance for particle rejection, antifouling and antibacterial properties.

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