EFFECTS OF ULTRASONIC IMPACT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF S355 STEEL
ZHANG DeChuan
GAO LiQiang
GU BangPing
ZHANG Heng
Abstract：Through the application of ultrasonic impact treatment technology to the surface of S355 steel,this research aimed to investigate the influence of different treatment durations on the material's microstructure,surface residual stresses,and tensile properties.The results show that ultrasonic impact treatment effectively mitigates residual tensile stresses in S355 steel while inducing compressive residual stresses.With an increase in ultrasonic impact treatment duration,the elimination of residual stresses along the x-axis and y-axis reaches values of 194.81 MPa and 200.46 MPa,respectively,at a treatment duration of 10 minutes.Furthermore,ultrasonic impact treatment prominently elevates the material's tensile strength and yield strength.Specifically,at a treatment duration of 10 minutes,the tensile strength and yield strength experience increments of 16 MPa and 13 MPa,respectively.By ultrasonic impact treatment,refinement of grain structure on the sample's surface is observed,alongside distinct manifestations of work hardening layers.A comprehensive analysis suggests that post ultrasonic impact treatment,the material's internal dislocation density increases,and grain refinement occurs,serving as pivotal factors in the release of residual tensile stresses and the enhancement of tensile performance.These outcomes provide an experimental foundation for a deeper comprehension of the mechanisms by which ultrasonic impact treatment contributes to the improvement of metallic material properties.
Keywords：Ultrasonic impact treatmentResidual stressTensile propertiesMicrostructure
Publication Date：2024-04-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 286-291 )