Effect of Ultrasonic Impact on Microstructure and Hardness of Thick Plate Dissimilar Steel T-type Welded Joints
-
摘要: 在18，27 μm冲击振幅下对Q420qD/20MnMoNb厚板异种钢T型焊接接头焊趾区进行超声冲击处理，分析了不同冲击振幅下焊趾处的显微组织、残余应力以及显微硬度，并与超声冲击前的进行了对比。结果表明：超声冲击处理后焊趾表层出现塑性变形层、大量位错及较高残余压应力，晶粒细化，硬度提高。当超声冲击振幅由18 μm增至27 μm，塑性变形层深度由约120 μm增大至144 μm，亚晶尺寸进一步细化至约25 nm，位错密度进一步增大至约2.48×1014 m-2；表面残余压应力增大至约433 MPa，其影响深度增大至约1 410 μm；表面硬度增大至约400 HV，硬化层深度增加至约900 μm。Abstract: Ultrasonic impact was conducted on the weld toe region of Q420qD/20MnMoNb thick plate dissimilar steel T-type welded joints with 18, 27 μm impact amplitudes, and the microstructure, residual stress and microhardness at the weld toe were analyzed under different impact amplitudes, and compared with those before ultrasonic impact. The results show that after ultrasonic impact, a plastic deformation layer, a lot of dislocations and a high compressive stress appeared on the surface layer of the weld toe, the grains were refined, and the hardness increased. When the ultrasonic impact amplitude increased from 18 μm to 27 μm, the depth of the plastic deformation layer increased from about 120 μm to 144 μm, the subcrystalline was further refined to about 25 nm in size, and the dislocation density increased to about 2.48×1014 m-2; the residual compressive stress on the surface increased to about 433 MPa and its affected depth increased to about 1 410 μm; the surface hardness increased to about 400 HV and the depth of hardening layer increased to about 900 μm.
-
Keywords:
- ultrasonic impact /
- thick plate T-type welded joint /
- microstructure /
- residual stress /
- hardness
-
-
[1] 白易立,王东坡,邓彩艳,等.超声冲击强度对焊接接头疲劳寿命的影响[J].焊接学报,2019,40(12):149-153. BAI Y L,WANG D P,DENG C Y,et al.Effect of ultrasonic impact strength on fatigue life of welded joints[J].Transactions of the China Welding Institution,2019,40(12):149-153.
[2] 蔡建鹏,何静,张彦杰,等.Q345/SUS304异种钢对接接头残余应力和变形的分析[J].焊接学报,2016,37(1):71-75. CAI J P,HE J,ZHANG Y J,et al.Study on welding residual stress and distortion of Q345/SUS304 dissimilar steel butt weld[J].Transactions of the China Welding Institution,2016,37(1):71-75.
[3] 李明,林健,雷永平,等.核电蒸汽发生器传热管/管板接头传热管内壁的焊接残余应力分布[J].机械工程材料,2019,43(1):82-86. LI M,LIN J,LEI Y P,et al.Welding residual stress distribution of heat transfer tube inner wall of tube-to-tubesheet joint in nuclear steam generator[J].Materials for Mechanical Engineering,2019,43(1):82-86.
[4] DONG W C,GAO D B,LU S P.Numerical investigation on residual stresses of the safe-end/nozzle dissimilar metal welded joint in CAP1400 nuclear power plants[J].Acta Metallurgica Sinica (English Letters),2019,32(5):618-628.
[5] ROY S,FISHER J W,YEN B T.Fatigue resistance of welded details enhanced by ultrasonic impact treatment (UIT)[J].International Journal of Fatigue,2003,25(9/10/11):1239-1247.
[6] GUJBA A,MEDRAJ M.Laser peening process and its impact on materials properties in comparison with shot peening and ultrasonic impact peening[J].Materials,2014,7(12):7925-7974.
[7] HATAMLEH O.A comprehensive investigation on the effects of laser and shot peening on fatigue crack growth in friction stir welded AA 2195 joints[J].International Journal of Fatigue,2009,31(5):974-988.
[8] 于影霞,何柏林,夏松松,等.超声冲击对AZ91D镁合金耐腐蚀性能的影响[J].热加工工艺,2015,44(20):138-141. YU Y X,HE B L,XIA S S,et al.Effect of ultrasonic impact treatment on corrosion resistance of AZ91D Mg alloy[J].Hot Working Technology,2015,44(20):138-141.
[9] QIAN S H,ZHANG T M,CHEN Y H,et al.Effect of ultrasonic impact treatment on microstructure and corrosion behavior of friction stir welding joints of 2219 aluminum alloy[J].Journal of Materials Research and Technology,2022,18:1631-1642.
[10] 刘成豪,陈芙蓉.超声冲击强化7A52铝合金VPPA-MIG焊接接头的疲劳性能[J].材料导报,2022,36(15):141-145. LIU C H,CHEN F R.Fatigue properties of the VPPA-MIG welded joint of the 7A52 aluminum alloy strengthened by ultrasonic impact[J].Materials Reports,2022,36(15):141-145.
[11] 何柏林,封亚明,李力.超声冲击及焊缝余高对6082铝合金焊接接头疲劳性能的影响[J].中国有色金属学报,2019,29(7):1377-1383. HE B L,FENG Y M,LI L.Effects of UIT and weld reinforcement on fatigue properties of 6082 aluminum alloy welded joint[J].The Chinese Journal of Nonferrous Metals,2019,29(7):1377-1383.
[12] DAAVARI M,SADOUGH VANINI S A.Corrosion fatigue enhancement of welded steel pipes by ultrasonic impact treatment[J].Materials Letters,2015,139:462-466.
[13] 唐大富.超声冲击处理对7A52铝合金焊接接头疲劳性能的影响[D].呼和浩特:内蒙古工业大学,2015. TANG D F.Effect of ultrasonic shock treatment on fatigue properties of 7A52 aluminum alloy welded joint[D].Hohhot:Inner Mongolia University of Tehchnology,2015.
[14] VIVES S,GAFFET E,MEUNIER C.X-ray diffraction line profile analysis of iron ball milled powders[J].Materials Science and Engineering:A,2004,366(2):229-238.
[15] LANGFORD J I.A rapid method for analysing the breadths of diffraction and spectral lines using the Voigt function[J].Journal of Applied Crystallography,1978,11(1):10-14.
[16] WILLIAMSON G K,SMALLMAN R E.III.Dislocation densities in some annealed and cold-worked metals from measurements on the X-ray Debye-Scherrer spectrum[J].Philosophical Magazine,1956,1(1):34-46.
[17] LIU H B, GAN J, JIANG C H, et al. Work softening mechanism and microstructure evolution of nanostructured Mg-8Gd-3Y alloy during severe shot peening[J]. Surface and Coatings Technology, 2022, 441:128601.
[18] WOHLFAHRT H. The influence of peening conditions on the resulting distribution of residual stress[C]//Proceedings of the Proceedings of the Second International Conference on Shot Peening, F. Chicago:[s.n.], 1984.
[19] TABOR D.A simple theory of static and dynamic hardness[J].Proceedings of the Royal Society of London Series A Mathematical and Physical Sciences,1948,192(1029):247-274.
[20] STARINK M J,CHENG X Y,YANG S F.Hardening of pure metals by high-pressure torsion:A physically based model employing volume-averaged defect evolutions[J].Acta Materialia,2013,61(1):183-192.
[21] HANSEN N.Hall-Petch relation and boundary strengthening[J].Scripta Materialia,2004,51(8):801-806.
[22] NAKASHIMA K,FUJIMURA Y,MATSUBAYASHI H,et al.Yielding behavior and change in dislocation substructure in an ultralow carbon martensitic steel[J].Tetsu-to-Hagane,2007,93(6):459-465.
计量
- 文章访问数: 25
- HTML全文浏览量: 1
- PDF下载量: 5
下载:
