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Microstructure and Micro-texture Development of Variable Frictional Heat Input Friction Stir Welded Joints of Laser Powder Bed Fusion-Made AlSi10Mg Plates

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Abstract

In this study, friction stir welding (FSW) joints of additively manufactured (AM) AlSi10Mg alloy, that is, medium heat input (joint 01), high heat input (joint 02), and low heat input (joint 03), were investigated to study the effect of frictional heat input on micro-texture evolution. A preliminary optical and SEM–EDS investigation revealed a homogeneous distribution of Al-Si particles in the high- and low-heat-input welded joints with an average particle size of 1.4 and 2.4 µm, respectively. In contrast, onion rings were only formed when the material flow was just right at a medium heat input, resulting in the highest ultimate tensile strength of 237 MPa among the three joints. Furthermore, the micro-texture analysis revealed that A/Ā ({1\(\overline{1 }\)1}<110>/{1\(\overline{1 }\)1}<\(\overline{1 }\overline{1 }\)0>) simple shear micro-textures with a slight C {001} <1\(\overline{1 }\)0>  were dominant in welds with superior mechanical strength, that is, medium-heat-input weldments. In contrast, the A*1/A*2 ({11\(\overline{1 }\)} <2\(\overline{1 }\)1>/{11\(\overline{1 }\)} <112>) shear components are more prominent in low- and high-heat-input weldments.

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Abbreviations

AM:

Additively manufactured

AS:

Advancing side

FSW:

Friction stir welding

HAZ:

Heat-affected zone

SZ:

Stir zone

TMAZ:

Thermomechanical affected zone

RS:

Retracting side

α :

Heat input efficiency

V :

Transverse speed of tool

q :

Net power from the shaft

μ :

Coefficient of friction

P :

Interface pressure between the tool and welding materials

N :

Tool rotation speed (RPM)

R :

Radius of the tool shoulder

F :

Normal Z-force during welding

d :

Diameter of the rotating pin

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Acknowledgements

The authors express their gratitude for the support received from the Department of Mechanical Engineering (Dr. B.R. Ambedkar National Institute of Technology, Jalandhar) for the mechanical testing. The authors also express their sincere thanks to the OIM and Texture Lab, IIT Bombay, for help with EBSD testing.

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The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this study.

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  1. Department of Industrial and Production Engineering, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar, Punjab, India

    Navdeep Minhas, Varun Sharma & Shailendra Singh Bhadauria

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  1. Navdeep Minhas
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Correspondence to Varun Sharma.

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Minhas, N., Sharma, V. & Bhadauria, S.S. Microstructure and Micro-texture Development of Variable Frictional Heat Input Friction Stir Welded Joints of Laser Powder Bed Fusion-Made AlSi10Mg Plates. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09426-2

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