A microstructure analysis of friction stir welded HSLA-65
- Haji H. ,
- Wynne B.P. and
- Palmiere E.J.
- Haji H. ,
- Wynne B.P. and
- Palmiere E.J.
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An experimental investigation was made on the effect of processing variables and tool material on the microstructure of friction stir welded (FSW) 6 mm thick HSLA-65 steel plate, with the aim of optimising the process variables for enhanced mechanical properties. Two plates of compositions (0.09%C, 0.26%Si, 1.42%Mn, 0.15%Cr, 0.35%Ni, 0.067%Mo, 0.018%Al) and (0.006%C, 0.015%Nb, 0.26%Cu, 0.011%Sn, 0.011%Ti, 0.058%V, 0.006%Co) were welded using tools made from tungsten-rhenium (WRe) and polycrystalline cubic boron nitride (PCBN). For the WRe tool rotation speed varied from 400 to 600 rpm and traverse speeds from 150-600 mm/min and for the PCBN tool rotation speed was 400 rpm and traverse speeds were 75-225 mm/min. Microstructure analysis was performed using optical microscopy. Microstructure was also studied following heat treatment of the samples at 500 deg.C in an Ar atmosphere. The effect of temperature on austenite grain size was studied at 50 deg. C intervals ranging from 900 to 1300 deg.C. Microhardness maps were produced for all welds.
8th International Symposium, 18-20 May 2010, Session 2A: Steel, Paper 02
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