摘要
设计了一种新型的超声处理方法-超声冲-滚(UI&R),以改善普通针式超声冲击(UIT)操作可控性差造成的金属材料表面粗糙度过高、表面应力分布不均匀等问题。采用X射线衍射仪(XRD)和扫描电镜(SEM)对比测试了普通针式UIT和UI&R处理工业纯钛焊接接头表层的残余应力、特征峰强度和表面粗糙度,实验结果表明:UI&R处理各条件下工业纯钛焊接接头区域残余压应力均匀程度较高;UI&T处理后纯钛表层组织细化至纳米级,最小晶粒尺寸为2 A-9 min处理条件下的69.7 nm;UI&T 2 A-6 min处理工业纯钛焊接接头表面粗糙度为4.6μm,仅为UIT同等处理参数下的51%。与普通针式UIT相比, UI&R处理能够使工业纯钛焊接接头处的残余压应力更加均匀、表面粗糙度更低, 2 A-6 min为UI&R处理改善工业纯钛焊接接头表面性能的最优工艺参数。
A new ultrasonic treatment method, ultrasonic impact-rolling(UI&R), was designed to improve the problem such as high surface roughness and uneven surface stress distribution caused by poor controllability during normal pin ultrasonic impact treatment(UIT) processing commercially pure titanium welded joints. X-ray diffraction(XRD) and scanning electron microscope(SEM) were used to test the residual stress, characteristic peak strength and surface roughness of the surface layer of commercial titanium welded joints after normal pin UIT and UI&R were processed respectively. The experimental results showed that the residual compressive stress in the welded joint area after UI&T treatment was more uniform;the surface structure of commercial titanium was refined to nanoscale and the minimum grain size was 69.7 nm at 2 A-9 min processing;the surface roughness of commercial titanium welded joint was 4.6 μm at 2 A-6 min processing, which was only 51% of the identical UIT processing. Compared with the normal pin UIT, the residual compressive stress at the commercial titanium welded joint during UI&R treatment was more uniform and the surface roughness was lower. 2 A-6 min was the optimal processing of UI&R treatment to improve the surface performance of commercial titanium welded joints.
作者
肖桂枝
张津
张聪惠
刘颖
Xiao Guizhi;Zhang Jin;Zhang Conghui;Liu Ying(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2019年第9期959-966,共8页
Chinese Journal of Rare Metals
基金
陕西省自然科学基础研究计划项目(2016JM5032)
陕西省教育厅重点实验室科研计划项目(17JS065)
东北大学轧制技术及连轧自动化国家重点实验室开放课题项目(2016004)
碑林区科技局项目资助
关键词
超声冲-滚
纯钛
焊接接头
残余应力
粗糙度
ultrasonic impact-rolling
titanium
welded joints
residual stress
roughness
