Fracture toughness of multipass friction stir welded API 5L X80 pipeline steel
- Avila J.A. ,
- Ruchert C.O.F.T. ,
- Mei P.R. ,
- et al
- Avila J.A. ,
- Ruchert C.O.F.T. ,
- Mei P.R. ,
- Marinho R.R. ,
- Paes M.T.P. and
- Ramirez A.J.
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A two-run friction stir welding process was employed to fabricate butt joints in API 5L X80 pipeline steel (0.08%C, 1.86%Mn, 0.16%Cr, 0.01%Ni, 0.18%Mo, 0.03%V, 0.06%Nb) plates (thickness 12 mm) and fracture toughness was determined in the parent metal, advancing and retreating side HAZs, and the stir zone. Welding was performed at a travel speed of 100 mm/min and spindle speed of 300 rpm using a composite polycrystalline cubic BN-WRe tool. Fracture toughness was determined in different critical regions using CTOD tests on three-point bending specimens at temperatures in the range 25 to -40 deg.C. Optical microscopy and SEM were employed to observe fracture surfaces. The occurrence of delamination in the parent metal and in specimens with notches in the HAZ is discussed.
10th International Symposium, 20-22 May 2014, Session 5B: Steel II, Paper 03
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