Crack growth rate of SMA490BW steel in different welding areas for bogie
The fatigue crack growth behavior of SMA490BW steel welded joints for high-speed train bogies under different stress ratios in different welding areas was studied,and the microstructure and fracture morphology of the welded areas were characterized by optical microscope and scanning electron microscope.The results show that under the same stress ratio,the different welding areas(weld nugget zone,heat affected zone)of SMA490BW steel have little effect on the crack growth rate.The stress ratio has a greater influence on the crack growth rate.Under the same stress intensity factor,the crack growth rate at R=-1 is significantly higher than that at R=0;the stress ratio has a greater influence on the c parameter in the Paris formula and less on the m parameter.
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