Bondability of Dissimilar Metal Sheets by Shot Peening

2013 ◽  
Vol 773-774 ◽  
pp. 818-823 ◽  
Author(s):  
Yasunori Harada ◽  
Masayuki Nunobiki
Keyword(s):  
Plastic Deformation ◽  
Shot Peening ◽  
Cast Steel ◽  
Pure Copper ◽  
The Other ◽  
Pure Aluminium ◽  
Low Carbon ◽  
Near Surface ◽  
Dissimilar Metal ◽  
Metal Sheets

In shot peening, bombarding the surface with steel shot propelled at high velocity causes plastic deformation of surface. The process with the characteristic deformation was applied to joining process. Our approach has been applied to the butt joining of the dissimilar metal sheets. In this method, however, the joint strength was lower than the flow stress of base metal. The modified joining processing was being carried out to improve the bondability. In the present study, the joining of dissimilar metal sheets using a shot peening process was investigated to improve the bondability. In the joined section, the edge of the joint area of the sheets were slit using a laser. In this method, the edges of the sheet are overlapped the other sheet. When the connection is peened, the material undergoes large plastic deformation near the surface due to the collision of shots. In this process, particularly noteworthy is the plastic flow near surface layer. The edges of the sheet are joined to the other sheet, thus two sheets can be joined each other. In the experiment, the shot peening treatment was performed by using an air-type peening machine. The shots used were made of high carbon cast steel. Air pressure was 0.6 MPa and peening time was in the range of 30-240s. The metal sheets were commercial low-carbon steel, stainless steel, pure aluminium, aluminium alloy, and pure copper. The effects of processing conditions on the bondability were mainly examined. It was found that the present method was effective for joining of dissimilar metal sheets.

Cold Joining of Dissimilar Metal Sheets by Shot Peening

2010 ◽  
Vol 654-656 ◽  
pp. 1327-1330 ◽  
Author(s):  
Yasunori Harada
Keyword(s):  
Shot Peening ◽  
Cast Steel ◽  
Pure Aluminum ◽  
Pure Copper ◽  
Pure Titanium ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
High Carbon ◽  
Dissimilar Metal ◽  
Metal Sheets

The cold joining of dissimilar metal sheets using a shot peening process was investigated. In shot peening the substrate undergoes large plastic deformation near the surface due to the hit with shots. Consequently, plastic flow areas formed by cold working may form the surface layer. The dissimilar sheets with the concavo-convex edge are connected, and then the contact area is shot-peened. In this joining, the convex edges of the sheet are laid on the other sheet. Namely, in the joining area, the two sheets are superimposed. In the experiment, the shot peening treatment was performed by using an air-type peening machine. The shots used were made of high carbon cast steel. Air pressure was 0.6MPa and peening time was in the range of 30-150s. The peening conditions were controlled in the experiment. The sheets were commercial low-carbon steel, stainless steel, pure aluminum, pure titanium, pure copper, and magnesium alloy. The effects of processing conditions on the joinability were mainly examined. The joint strength increased with the kinetic energy of shots. It was found that the present method was effective for cold joining of dissimilar metal sheets.

Butt Joining of High Strength Steel Sheet and Dissimilar Metal Sheet by Shot Peening

2010 ◽  
Vol 638-642 ◽  
pp. 3667-3672 ◽  
Author(s):  
Yasunori Harada ◽  
Takeshi Uemori
Keyword(s):  
Plastic Deformation ◽  
Shot Peening ◽  
High Strength Steel ◽  
Cast Steel ◽  
High Strength ◽  
Average Diameter ◽  
Large Plastic Deformation ◽  
Dissimilar Metal ◽  
Metal Sheets ◽  
Notch Geometry

In the shot peening process, the substrate undergoes large plastic deformation near the surface due to the hit with many shots. A large plastic deformation characterized by a shear droop occurs at the edge of the substrate. When the dissimilar sheets with the edge of the notch geometry are connected without level difference and then the contact area are shot-peened, the sheets can be joined due to the plastic flow generated by a large plastic deformation during shot peening. This method is similar to joining by caulking. The aim of this paper is to investigate the butt joining of high strength steel and dissimilar metal sheets using a shot peening process. The shot velocity and the coverage were controlled in the experiment. The shots used were made of high carbon cast steel and cemented carbide with an average diameter of 0.1 mm. The sheets were high strength steel and aluminum alloys. The influences of processing conditions on the joinability were mainly examined. The joint strength increased with the kinetic energy of shots. Tensile test was also examined to evaluate bond strength. It was found that the present method can be used to enhance the butt joining of high strength steel and dissimilar metal sheets.

Investigation of Deformation Gradients in Surface Zone of Mechanically Surface Treated CuZn30

2007 ◽  
Vol 561-565 ◽  
pp. 2229-2232 ◽  
Author(s):  
Sang Bong Yi ◽  
Tomasz Ludian ◽  
Lothar Wagner
Keyword(s):  
Plastic Deformation ◽  
Shot Peening ◽  
Cold Work ◽  
Local Deformation ◽  
Surface Zone ◽  
Ball Burnishing ◽  
Deformation Degree ◽  
Near Surface ◽  
Ball Size ◽  
Almen Intensity

The deformation degrees in near-surface zones and related microstructural changes in CuZn30 were determined after shot peening and ball-burnishing. The induced depths of plastic deformation increase with Almen intensity and rolling pressure in shot peening and ball-burnishing, respectively. As the ball size in burnishing increases, the depth of plastic deformation also increases. The local degrees of cold work within the affected depths were estimated by comparing micro-hardness values, penetration depths of induced slip bands as well as X-ray diffraction peak widths with those measured in blanks cold rolled to fixed degrees of plastic strain. The results clearly indicate that very high local deformation degrees above 80% are typically induced by mechanical surface treatments in areas very close to the surface with this deformation degree gradually decreasing with increasing distance to the surface. Depending on the intensity of ball-burnishing, deformation degrees still of the order of 10% were observed in regions having distances to the surface of as large as 1000 (m.

Effect of Optimization of Shot Peening Parameters on Surface Integrity of NAK80

2010 ◽  
Vol 426-427 ◽  
pp. 537-539 ◽  
Author(s):  
Hong Miao ◽  
Dun Wen Zuo ◽  
Hong Feng Wang ◽  
X.W. Sha
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Crack Initiation ◽  
Yield Stress ◽  
Surface Integrity ◽  
Shot Peening ◽  
Experimental Result ◽  
Near Surface ◽  
Crystal Block

Shot peening is known to improve the fatigue performance of materials. The improvement in fatigue is that plastic deformation in the surface increases hardness, yield stress and microstrain of thinning Crystal block and dislocation density, and formed advantaged compress residual stress that are introduced into the near-surface of the components and which hinder crack initiation and growth. But over peening effect is produced when shot peening strengthening goes beyond a certain limit, which was adverse to improve surface quality. This paper adopted the optimization of the critical peening parameters to avoid appearing over peening effect. The experimental result showed that arc high value of optimal shot peening was 0.40mm.

Formation of Fe-Al Intermetallic Compound Film on High-Speed Tool Steel by Shot Lining and Heat Treatment

2014 ◽  
Vol 783-786 ◽  
pp. 1414-1419
Author(s):  
Yasunori Harada ◽  
Makoto Ishida ◽  
Katsuhiko Takahashi
Keyword(s):  
Heat Treatment ◽  
Intermetallic Compound ◽  
Tool Steel ◽  
Shot Peening ◽  
High Speed ◽  
Substrate Surface ◽  
Cast Steel ◽  
Fatigue Property ◽  
Thin Foil ◽  
Pure Aluminium

Shot peening is widely utilized to improve the fatigue property of mechanical parts for transportation equipment such as cars and airplanes. Also, this technology is being applied as a film-forming technology in order to improve surface quality. The authors have recently proposed new joining methods using shot peening, shot lining. In this method, the metals are bonded with the dissimilar metal by applying plastic deformation and the pressure. The thin foil can be joined to the substrate surface by the pressure generated by the hit of the shots. In this study, the formation of an Fe-Al intermetallic compound film on high-speed tool steel by shot lining and heat treatment was investigated. In the experiment, a centrifugal-type peening machine with an electrical heater was employed. The shot medium was high-carbon cast steel. The substrate was a commercial high-speed tool steel JIS-SKH51, and the foil was commercially available pure aluminium. The shot lining process of tool steel with an aluminium foil was carried out at 573K in air using a peening machine. Heat treatment was performed at diffusion temperatures from 923 to 1573K in vacuum. The lined substrates exhibited a harder layer of aluminium-rich intermetallics in the diffusion temperature range of 923 to 1173K. When the temperature of the lined substrates was more than 1273K, the surface was covered with thicker and highly anticorrosive layers of iron-rich intermetallics. We found that the present method could be used for the formation of functional films on high-speed tool steel.

Influence of Compressive Stress to the Corrosion Rate of Magnesium

2016 ◽  
Vol 713 ◽  
pp. 284-287 ◽  
Author(s):  
Tetsuya Kawai ◽  
Noriyuki Takano
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Corrosion Rate ◽  
Mechanical Strength ◽  
Compressive Stress ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Elastic Stress ◽  
The Body ◽  
The Other

Magnesium has made an attention as implant material. Because it is decomposed and absorbed in the body, and its mechanical strength is stronger than that of polymers. It is, however, reported that the corrosion rate increases under the compressive elastic stress. In the other hand, it decreases in the specimen whose surface is applied to compressive residual stress by laser shot peening. This implies that compressive plastic deformation reduces the corrosion rate. In the present paper, the corrosion rate of magnesium that was plastically deformed by uniform high compressive stress was researched. As the result, the corrosion rate decreased as the compressive stress increased.

COLD BUTT JOINING OF LIGHT METAL SHEET BY SHOT PEENING

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6100-6105
Author(s):  
YASUNORI HARADA ◽  
YUJI KOBAYASHI
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Shot Peening ◽  
Light Metal ◽  
Substrate Material ◽  
Metal Sheet ◽  
Fusion Welding ◽  
Dissimilar Material ◽  
Large Plastic Deformation ◽  
Metal Sheets

Aluminum and magnesium materials are very attractive for light weight applications. However, their use is complicated by the fact that dissimilar metals are joined by fusion welding. In the present study, the cold butt joining of light metal sheet with dissimilar material sheet by shot peening was investigated. The shot peening process is widely used to improve the performance of engineering components. In this process the substrate undergoes a large plastic deformation near its surface when hit by many shots. The substrate material close to the surface flows during shot peening. When the dissimilar metal sheets with notched edges are connected without a level difference and then the connection is shot peened, the sheets can be joined by the plastic flow generated by the large plastic deformation during shot peening. In this experiment, an air-type shot peening machine was used. The influences of peening time and shot material on joinability were mainly examined. The joinability was evaluated by tensile test. The joint strength increased with the amount of plastic flow. It was found that the present method can be used to enhance the butt joining of the light metal sheets with the dissimilar material sheets.

scholarly journals Microstructure Evolution of the Carbon Steels During Surface Severe Plastic Deformation

2021 ◽  
Vol 22 (4) ◽  
pp. 562-618
Author(s):  
M. O. Vasylyev ◽  
B. M. Mordyuk ◽  
S. M. Voloshko ◽  
D. A. Lesyk
Keyword(s):  
Electron Microscopy ◽  
Plastic Deformation ◽  
Carbon Steel ◽  
Severe Plastic Deformation ◽  
Microstructure Evolution ◽  
High Carbon Steel ◽  
Carbon Steels ◽  
Surface Mechanical Attrition Treatment ◽  
Low Carbon ◽  
Near Surface

The review is devoted to the state-of-the-art views on the microstructure evolution in structural and tool carbon steels during the surface severe plastic deformation (SPD). The main focus is on the effects of the nanocrystallization in the near-surface area of the low-carbon steel (C 0.05–0.2%), medium-carbon steel (C 0.35–0.65%), and high-carbon steel (C 1.0–1.5%). It is reviewed the following advanced surface SPD methods for the metal surfaces in recent years: an ultrasonic impact peening (UIP), high-frequency impact peening (HFIP), air blast shot peening (ABSP), surface mechanical attrition treatment (SMAT), and laser shock peening (LSP). Microstructure evolution before and after SPD is studied by optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The effects of the SPD parameters on the nanocrystalline modification of such main phase components of the carbon steels as ferrite, pearlite, and cementite are analysed. The atomic mechanism of the nanocrystallization is presented. The strain-hardening effect induced by SPD is demonstrated by the data of the near-surface microhardness profiles.

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