An investigation on the microstructure and mechanical properties of dissimilar laser welded joint between AISI 430 ferritic stainless steel and AISI 2304 duplex stainless steel in order to optimize the fracture force of joints

Authors

1 Department of Materials and metallurgical engineering, Arak University. Arak, iran

2 Department of Materials and Metallurgical Engineering, Arak University, Arak, Iran

3 Department of Materials and Metallurgical engineering, Faculty of Engineering, Arak University, Arak, Iran

4 Department of Mechanical Engineering, Arak University of Technology, Arak, Iran

Abstract

In this research, dissimilar joint between AISI 430 ferritic stainless steel and AISI 2304 duplex stainless steel was made by Nd:YAG laser welding process. At first, microstructural and phase evolutions and also changes in mechanical properties due to the welding process were investigated. Hence, mechanical properties of weld joints were optimized using statistical methods. For this purpose, response surface methodology based on central composite design was used in order to find the optimum values of laser power, welding speed and defocusing distance and to obtain the maximum value of fracture force of joints. Uniaxial tensile test and optical microscopy were used to study the mechanical properties and structural features of weld joints, respectively. It was found that the fracture force of weld joints increases by decrease in welding speed and laser power and the maximum fracture force reached to 3587 N. Regarding microstructural evolutions studies, grain growth and presence of dispersed carbides in the fusion zone were observed. Finally, the effect of heat input on the hardness profile was evaluated and discussed. According to the result, the maximum hardness was obtained in the weld metal of the sample with low heat input and it was measured at about 332 vickers.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 10, Issue 3
October 2020
Pages 158-147

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