超声冲击处理对S355钢表层组织及力学性能的影响  

EFFECTS OF ULTRASONIC IMPACT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF S355 STEEL

作　　者：高立强[1] 张德川 顾邦平[1] 张衡 GAO LiQiang;ZHANG DeChuan;GU BangPing;ZHANG Heng(Logistics Engineering College,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学物流工程学院,上海201306

出　　处：《机械强度》2024年第2期286-291,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(52105466)资助。

摘　　要：通过超声冲击处理技术对S355钢表面进行处理,分析不同处理时间对材料显微组织、表层残余应力及拉伸性能的影响规律。结果表明,超声冲击处理能够有效地消减S355钢的残余拉应力,引入残余压应力,且引入的残余压应力随着超声冲击时间的增加而增加,在冲击时间达到10 min时,x轴、y轴的残余应力消除值分别为194.81、200.46 MPa。此外,超声冲击处理能够提升材料的抗拉强度和屈服强度,在冲击时间为10 min时,抗拉强度和屈服强度分别增加了16、13 MPa。经超声冲击处理后,试样表层晶粒得到了细化,且观察到明显的加工硬化层。超声冲击处理后材料内部位错密度增加、晶粒细化是导致残余拉应力转变为残余压应力和拉伸性能提升的本质原因。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.

关 键 词：超声冲击 残余应力 拉伸性能 显微组织 

分 类 号：TG115[金属学及工艺—物理冶金] O32[金属学及工艺—金属学]