Effect of ultrasonic impact power on microstructure and properties of S355J2G4 steel welded joint
Based on the same ultrasonic impact time,the ultrasonic impact treatments were carried out on the S355J2G4 steel welded joints used in railway vehicles with different ultrasonic impact powers in this paper.The effects of ultrasonic impact power on the microstructure,mechanical properties and wear resistance were systematic studied.The results indicated that the thickness of plastic deformation layer on the joint surface increased and the grain size decreased when the ultrasonic impact power increased,but too large ultrasonic impact power would cause damage on the joint surface.The surface hardness of the joint increased obviously with the increase of ultrasonic impact power,while the tensile property of the joints had no obvious change.With the increase of the ultrasonic impact power,the fatigue property of the joints increased first and then decreased.The wear resistance of the joints improved obviously when the ultrasonic impact power increased.The comprehensive performance of the welded joint treated with 50％ultrasonic impact power was the best when the ultrasonic impact time was 6 min.
万方数据
维普
