Peak Stir Zone Temperatures during Friction Stir Processing |
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| Authors: | Srinivasan Swaminathan Keiichiro Oh-Ishi Alexander P Zhilyaev Christian B Fuller Blair London Murray W Mahoney Terry R McNelley |
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| Affiliation: | 1.General Electric–Global Research,Bangalore,India;2.National Institute for Materials Science,Tsukuba,Japan;3.Centro Nacional de Investigaciones Metalúrgicas (CENIM),CSIC,Madrid,Spain;4.Institute for Metals Superplasticity Problems,RAS,Ufa,Russia;5.Healthcare Division,General Electric Co.,Milwaukee,USA;6.Department of Materials Engineering,California Polytechnic State University,San Luis Obispo,USA;7.Midway,USA;8.Center for Materials Science and Engineering, Department of Mechanical and Astronautical Engineering,Naval Post Graduate School,Monterey,USA |
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| Abstract: | The stir zone (SZ) temperature cycle was measured during the friction stir processing (FSP) of NiAl bronze plates. The FSP
was conducted using a tool design with a smooth concave shoulder and a 12.7-mm step-spiral pin. Temperature sensing was accomplished
using sheathed thermocouples embedded in the tool path within the plates, while simultaneous optical pyrometry measurements
of surface temperatures were also obtained. Peak SZ temperatures were 990 °C to 1015 °C (0.90 to 0.97 T
Melt) and were not affected by preheating to 400 °C, although the dwell time above 900 °C was increased by the preheating. Thermocouple
data suggested little variation in peak temperature across the SZ, although thermocouples initially located on the advancing
sides and at the centerlines of the tool traverses were displaced to the retreating sides, precluding direct assessment of
the temperature variation across the SZ. Microstructure-based estimates of local peak SZ temperatures have been made on these
and on other similarly processed materials. Altogether, the peak-temperature determinations from these different measurement
techniques are in close agreement. |
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