Stationary Shoulder Friction Stir Processing: Influence of Tool Wear on Surface Properties

Abstract:

In the present study, the influence of stationary shoulder friction stir processing (SSFSP) tool wear on the processed surface was investigated. SSFSP is a solid-state process that uses a rotating tool plunged in the material to promote microstructure modification, mainly grain refinement, on the workpiece without melting the material itself. It differs from conventional Friction Stir Processing (FSP) since in the SSFSP the tool shoulder does not rotate and simply slides on the surface. The workpiece processed with SSFSP shows a smoother surface without shoulder marks, and with smaller flash than conventional FSP. The tool wear could slightly change the profile of the shoulder and affects process soundness. SSFSP testing made up of 2880 experiments, each one with a path length of 50 mm, was realized on AA 6082 T6 sheets with 3.0 mm thickness using 1500 rpm tool rotation speed and 300 mm/min welding speed. Optical and confocal microscopy analysis and Vickers micro hardness measurements allowed putting in evidence the characteristics of the processed surfaces and their modifications as a function of tool wear.

• Periodical: Key Engineering Materials (Volume 813)
• Pages: 393-398
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.813.393
• Online since: July 2019
• Authors: Filomena Impero*, Fabio Scherillo, Alessia Teresa Silvestri, Renzo Casarin, Antonello Astarita, Antonino Squillace
• Keywords: Friction Stir Processing, Roughness Surface, Vickers Microhardness, Wear Tool

References

[1] R.S. Mishra, Z. Y. Ma, I. Charit, Friction stir processing: a novel technique for fabrication of surface composite, Material Science and Engineering A 341 (2003) 307-310.

DOI: 10.1016/s0921-5093(02)00199-5

[2] Z.Y. Ma, Friction Stir Processing Technology: A Review, Metallurgical and Materials Transactions A March 39, 3 (2008) 642-658.

[3] R.S. Mishra, Z.Y. Ma, Friction stir welding and processing, Material Science and Engineering R 50 (2005) 1-78.

[4] Indira Rani M., Marpu R.N., A.C.S. Kumar, A study of process parameters of friction stir welded AA 6061 aluminum alloy in O and T6 conditions, ARPN Journal of Engineering and Applied Sciences, 6, 2 (2011).

[5] P. Prasanna, Dr.Ch. Penchalayya, Dr. D. Anandamohana Rao, Effect of tool pin profiles and heat treatment process in the friction stir welding of AA 6061 aluminum alloy, AJER 2, 1 (2013)7-15.

[6] Reza-E-Rabby, Anthony P. Reynolds Effect of tool pin thread forms on friction stir weldability of different aluminum alloys Md. 10th International Conference on Mechanical Engineering ICME (2013).

DOI: 10.1016/j.proeng.2014.11.784

[7] N. Balasubramaniana, R.S. Mishra, K. Krishnamurthy, Friction stir channeling: Characterization of the channels, J mater process tech 209 (2009) 3696-3704.

DOI: 10.1016/j.jmatprotec.2008.08.036