Production of a Superplastic Vibration-Damping Steel Sheet Composite Using Friction Stir Forming

Tabatabaei, Hamed Mofidi; Hara, T.; Nishihara, Tadashi

doi:10.4028/www.scientific.net/msf.838-839.574

Cited by 11 publications

(11 citation statements)

References 10 publications

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“…Recently, a new metal forming method using the principles of Friction Stir Welding (FSW) [1] called "Friction Stir Forming (FSF)" [2] has gained attention in the field of dissimilar material joining [3][4][5][6][7]. Prof. Tadashi Nishihara of Kokushikan University, the developer of this method, proposed placing the workpiece on the mold and applying friction stir on the backside of the workpiece to transfer the mold shape onto the workpiece, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Effect of friction stir forming parameters on mechanical properties and plastic flow of material in the mechanical interlocking of optical fiber and SP-700 superplastic titanium alloy

Tabatabaei

2023

Superplasticity in Advanced Materials

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Abstract. The present study discusses the fluidity of titanium alloy during friction stir forming (FSF) and investigates the effect of process parameters on the mechanical properties of titanium alloy in the mechanical interlocking of optical fiber and SP-700 superplastic titanium alloy. In this study, a guide slit is provided in a titanium alloy plate, an optical fiber is placed inside the slit, and FSF is performed on the surface of the titanium alloy. By performing FSF, titanium softens and material plastically deforms inside the slit, which results in mechanically joining optical fiber and titanium alloy. Experimental results of evaluating the mechanical properties after FSF revealed that the hardness value of the material that flowed into the slit was significantly higher than that of the base material, which confirms that the stirring zone has flowed into the slit around the fiber. It was also confirmed that the temperature becomes unstable during the process for a travel speed of 50 mm/min or less, also above 800 mm/min. This resulted in insufficient material flow. As a result, inhomogeneous structures were confirmed. Tensile test results after FSF showed that the strength was lower than that of the base metal (67% to 55% of the base metal) for most process parameters. Although no significant changes in strength were observed by changing the travel speed, it was confirmed that the strength has an increasing tendency as the rotation speed increases, which is considered to be related to the grain refinement of the material. It was also concluded that the limitations in the present study such as insufficient material flow and reduced strength and also damage to the embedded optical fiber can be improved by pre-heating the workpiece and controlling the FSF process parameters which require further experiments and temperature measurements during FSF. In this study, the developed composite can give us hope for embedding FBG sensors inside high melting point alloys to simultaneously measure deformation, strain, pressure, and temperature and create new functional smart materials.

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Section: Introductionmentioning

confidence: 99%

Effect of friction stir forming parameters on mechanical properties and plastic flow of material in the mechanical interlocking of optical fiber and SP-700 superplastic titanium alloy

Tabatabaei

2023

Superplasticity in Advanced Materials

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“…On the other hand, a new metal forming method using the principles of Friction Stir Welding (FSW) [1] called "Friction Stir Forming (FSF)" [2] has gained attention in the field of dissimilar material joining [3][4][5][6][7][8][9][10]. Prof. Tadashi Nishihara of Kokushikan University, the developer of this method, proposed placing the workpiece on the mold and applying friction stir on the backside of the workpiece to transfer the mold shape onto the workpiece.…”

Section: Introductionmentioning

confidence: 99%

Relation between Process Parameters and Pressure during Friction Stir Forming in the Development of a Superplastic Composite Steel Sheets

Tabatabaei,

Ohashi,

Nishihara

2023

MSF

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In previous research conducted by the authors, a new vibration-damping steel sheet was developed using a new method employing friction stir forming (FSF) to create a laminated composite sheet in which steel sheets and superplastic alloys are laminated in layers. However, the details of the bonding mechanism have not yet been clarified. The present study investigates the relationship between the pressure during the process and the weld interface in the creation of the mentioned superplastic composite sheet. More specifically, a 0.5mm thick perforated steel plate is inserted between two Zn-22Al superplastic alloys and the FSF is applied to the top layer of Zn-22Al. The probe of the FSF tool passes directly above the perforated steel plate, the material stirred by the probe plastically flows into the hole and is joined to the underlying Zn-22Al interface by superplastic diffusion bonding (SPF/DB). It was revealed that the process parameters (rotational speed and tool feed rate) must be perfectly adequate to produce adequate heat input and pressure leading to a proper plastic flow of the material and the occurrence of superplasticity in Zn-22Al. In this study, as a first step to clarify the detailed joining mechanism, the amount of pressure applied to the specimen during the process is measured. While changing the process parameters, the pressure was measured at three points, under the probe of the friction stir process tool and, on the advancing, and retreating sides, to investigate the relationship between the parameters and the pressure at the joint interface.

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“…This method is called 'friction stir forming (FSF)'. FSF was invented by Nishihara [2] at Kokushikan University and has been studied in the authors' laboratory [3][4][5][6][7]. The functions of FSF are to machine a groove on a die, place a plate on it and perform the process on its backside.…”

Section: Introductionmentioning

confidence: 99%

Effect of Friction Stir Forming Process Parameters on Mechanical Interlock between A5083Alloy and Ultra-Thin Stainless Steel Strands

Tabatabaei

Kobayashi

Ohashi

et al. 2020

KEM

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Fibre-reinforced materials have gathered attention because of their significant properties such as heat resistance, abrasion resistance and specific strength. The present study proposes a new method of joining stainless steel strands with an aluminium alloy using friction stir forming and analyses the formation of a fibre-reinforced aluminium alloy composite material. Mechanical interlocks between the strands and the aluminium alloy are evaluated based on cross-sectional microstructure observations and EDS analysis. The tensile test indicated an increasing tendency of strength by increasing the number of strands and bending tests showed that higher strength is achieved in rare bend because of inhomogeneous grain distribution after friction stir forming (FSF).

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Production of a Superplastic Vibration-Damping Steel Sheet Composite Using Friction Stir Forming

Cited by 11 publications

References 10 publications

Effect of friction stir forming parameters on mechanical properties and plastic flow of material in the mechanical interlocking of optical fiber and SP-700 superplastic titanium alloy

Effect of friction stir forming parameters on mechanical properties and plastic flow of material in the mechanical interlocking of optical fiber and SP-700 superplastic titanium alloy

Relation between Process Parameters and Pressure during Friction Stir Forming in the Development of a Superplastic Composite Steel Sheets

Effect of Friction Stir Forming Process Parameters on Mechanical Interlock between A5083Alloy and Ultra-Thin Stainless Steel Strands

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