The effect of gradient microstructure on mechanical property of friction stir welded joint of high nitrogen austenitic stainless steel
- Du D.X. ,
- Fu R.D. ,
- Li Y.J. ,
- et al
- Du D.X. ,
- Fu R.D. ,
- Li Y.J. ,
- Wang J. ,
- Jing L. and
- Shi Y.
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Friction stir welding was employed to fabricate welded joints in Ni-free 18%Cr, 2%Mo, 0.85%N austenitic steel sheets (thickness 3 mm) and the gradient characteristics of the microstructures and mechanical properties were investigated along transverse and thickness directions. Welding was conducted at a travel speed of 50 mm/min and rotational speed of 800 rpm using a W-Re tool. PWHT was performed on as-welded joints at 1100 deg.C for 90 min. Microstructure was observed by optical microscopy and electron backscattered diffraction. Mechanical properties were characterised by Vickers hardness measurements as well as local and integral tensile tests. Issues discussed include the effect of the gradients on strength and elongation in top and bottom layers and the influence of PWHT on the gradients.
10th International Symposium, 20-22 May 2014, Session 6B: Performance, Paper 01
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