A Study on Fatigue Crack Growth Rate of Q345/316L Dissimilar Welded Joint
The Q345 and 316L steel plates were welded by tungsten inert gas welding and compact tensile specimens were prepared at different areas of the joint.Through fatigue crack growth test,the relationship between crack length and cycle times was obtained by using the principle of flexibility method,and the relationship curve between crack growth rate and stress intensity factor range was drawn.Paris formula for each region of the welded joint was obtained by curve fitting.The results show that in the early stage of crack growth,the fatigue crack growth rates of different regions are different,and the growth rates of Q345 and 316L base materials are the fastest.The expansion rate of welds in heat-affected zone on both sides is the slowest.In the late stage of crack growth,the fatigue crack growth rate of each region is roughly the same.
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