Fatigue behaviour of AISI 304 steel to AISI 4340 steel welded by friction welding

In the presented study, The weldability of AISI 304 austenitic stainless steel to AISI 4340 steel joined by friction welding in different rotational speeds and fatigue behaviour of friction-welded samples were investigated. Tension tests were applied to welded parts to obtain the strength of the joints. The welding zones were examined by scanning electron microscopy (SEM) and analyzed by energy dispersive spectroscopy (EDS). The Vıckers microhardness distributions in welding zone were determined. Fatigue tests were performed using a rotational bending fatigue test machine and the fatigue strength has been analysed drawing S-N curves and critically observing fatigue fracture surfaces of the tested samples. The experimental results indicate that mechanical properties and microstructural features are affected significantly by rotation speed and the fatigue strength of friction-welded samples decrease due to chromium carbide precipitation in welding zone with increasing rotation speed in choosen conditions.

[1]  H. Tsubakino,et al.  Evaluation of friction weld interface of aluminium to austenitic stainless steel joint , 1997 .

[2]  James C. Newman,et al.  The Merging of Fatigue and Fracture Mechanics Concepts: A Historical Perspective , 1998 .

[3]  L. Tsay,et al.  Fatigue crack growth of AISI 304 stainless steel welds in air and hydrogen , 2004 .

[4]  S. Nam,et al.  Investigation of the effect of the types and densities of grain boundary carbides on grain boundary cavitation resistance of AISI 321 stainless steel under creep-fatigue interaction , 2004 .

[5]  S. Nam,et al.  Correlation of the M23C6 precipitation morphology with grain boundary characteristics in austenitic stainless steel , 2001 .

[6]  V. Radhakrishnan,et al.  Effect of welding process on fatigue crack growth behaviour of austenitic stainless steel welds in a low alloy (Q & T) steel , 1997 .

[7]  D. O’Sullivan,et al.  Machinability of austenitic stainless steel SS303 , 2002 .

[8]  S. Park,et al.  Corrosion resistance of friction stir welded 304 stainless steel , 2004 .

[9]  J. M. Corum,et al.  High-temperature mechanical behavior of Ti-6Al-4V alloy and TiCp/Ti-6Al-4V composite , 1999 .

[10]  M. Wahab,et al.  Corrosion and biaxial fatigue of welded structures , 2003 .

[11]  S. Sundaresan,et al.  The formation of intermetallic phases in aluminium-austenitic stainless steel friction welds , 1994 .

[12]  A. Vairis,et al.  High frequency linear friction welding of a titanium alloy , 1998 .

[13]  M. Eroglu,et al.  Diffusion bonding between Ti -6Al -4V alloy and microduplex stainless steel with copper interlayer , 2002 .

[14]  Fatigue life prediction for stainless steel welded plate CCT geometry based on Lawrence's local-stress approach , 2003 .

[15]  S. Nam,et al.  Effects of nitrogen on low-cycle fatigue properties of type 304L austenitic stainless steels tested with and without tensile strain hold , 2002 .

[16]  A. Sahin,et al.  Analysis of the friction welding process in relation to the welding of copper and steel bars , 1998 .

[17]  S. Nam,et al.  A study on the crack initiation and growth from δ-ferrite/γ phase interface under continuous fatigue and creep-fatigue conditions in type 304L stainless steels , 2002 .

[18]  A. K. Bhaduri,et al.  Fatigue failure of a fillet welded nozzle joint , 2003 .

[19]  J. F. Hobart.  Brazing and Soldering , 2007 .

[20]  Jorge F. Santos,et al.  Mechanical and metallurgical properties of friction-welded TiC particulate reinforced Ti–6Al–4V , 2004 .

[21]  V. Hauk,et al.  Micro-residual stresses caused by deformation, heat, or their combination during friction welding , 2000 .