Microstructure and mechanical properties of friction stir welded 18Cr-2Mo ferritic stainless steel heavy plate
- Li H.J. ,
- Han J. and
- Barbaro F.
- Li H.J. ,
- Han J. and
- Barbaro F.
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Thick sheets (thickness 5.4 mm) of a ferritic stainless steel (18.33%Cr, 1.81%Mo, 0.2%Nb) were joined by friction stir welding with optimised process parameters (rotational speed 200 rpm, welding speed 100-160 mm/min) and the microstructure and mechanical properties of the welded joints were investigated. A composite tool incorporating a conical probe with a stepped spiral design and consisting of cubic boron nitride in a W-Re matrix was employed. Microstructure was observed by optical microscopy, SEM and electron backscattered diffraction. Mechanical properties were characterised by hardness measurements and impact toughness testing. The fine-grained microstructure in the stir zone and thermomechanically affected zone is discussed.
10th International Symposium, 20-22 May 2014, Session 5B: Steel II, Paper 01
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