A Novel Technique to Prepare Cast Al-bearing alloy/Wrought Steel Bimetallic Specimen for Interfacial Shear Strength

M Ramadan, ,A S Al-Ghamdi,W Rajhi,T Subhani,B Ayadi

doi:10.35940/ijeat.c6084.029320

Abstract

A novel mold was designed and manufactured for facile preparation of cast/wrought bimetallic specimen for subsequent mechanical performance. To ensure the easy manufacturing of bimetallic specimen, an aluminum bearing alloy was cast on a wrought carbon steel substrate after tinning process for adequate interfacial bonding in the especially prepared mold, which was characterized mechanically by lap-joint shear test to measure bonding strength between the two materials and by microhardness test for hardness profile across the interface. Optical and electron microscopy was employed for the microstructural observation of the interface to relate it with the mechanical performance of bimetallic material for bearing and automotive applications while electron dispersive spectroscopy mapped the elemental distribution across interface.

Highlights

Bimetallic materials constitute a special group of materials containing two materials bonded together by appropriate adhesion techniques
After casting and solidification of Al-Sn-Si-Cu alloy on carbon steel substrate using the specially designed mold, the bimetallic specimen was removed from the mold and the thickness of the cast Al-Sn-Si-Cu alloy was reduced to 2mm to match the thickness of counter carbon steel strip
The electron microscopy of the specimen was performed on scanning electron microscope (SEM) TESCAN, MIRA-III, FEG-SEM, Czech Republic attached with electron dispersive spectroscopy (EDS)

Summary

INTRODUCTION

Bimetallic materials constitute a special group of materials containing two materials bonded together by appropriate adhesion techniques. Thermal spraying process is used to deposit cast alloy on complicated substrate surfaces. Among a wide range of available depositing materials, aluminum alloys have the advantage of high specific properties. Another edge of aluminum alloys is their high thermal conductivity. A bimetallic cast aluminum/wrought steel material is prepared by a novel specimen-preparing technique for subsequent measurement of interfacial shearing strength. Aluminum alloy was bonded with substrate carbon steel by pouring the molten aluminum alloy through static or gravity casting. A Novel Technique to Prepare Cast Al-bearing alloy/Wrought Steel Bimetallic Specimen for Interfacial Shear Strength. The prepared sample was removed from the mold and tested for shear strength after machining down the thickness of aluminum to match steel strip

Materials and Manufacturing

Characterization

RESULTS AND DISCUSSION

CONCLUSIONS