Advertisement

Welding in the World

, Volume 62, Issue 4, pp 721–727 | Cite as

Microstructures and their distribution within HAZ of X80 pipeline steel welded using hybrid laser-MIG welding

  • Limeng Yin
  • Jinzhao Wang
  • Xizhang Chen
  • Cheng Liu
  • Arshad Noor Siddiquee
  • Gang Wang
  • Zongxiang Yao
Research Paper
  • 200 Downloads

Abstract

Large microstructure gradient in the heat-affected zone (HAZ) in the joints of large thick material welded by the hybrid laser-MIG welding technology reduces the in-service reliability and durability of the welded structure. It is of great importance to characterize and analyze how the microstructure distribution and evolution occur in the HAZ of the laser-MIG hybrid welded joints fabricated with X80 pipeline steel. In this article, the HAZ is found to comprise these characteristic zones, namely banded microstructure HAZ (BMHAZ), fine-grained HAZ (FGHAZ), transitional microstructure HAZ (TMHAZ), and coarse-grained HAZ (CGHAZ). The zone of the HAZ contains quasi-polygonal ferrite (QF), M-A component, polygonal ferrite (PF), and bainite ferrite (BF). From the base metal side towards the weld center with the decrease in the distance, the size of the M-A components decreases and its distribution is more dispersed, while the content of QF decreases in the HAZ. The average diameter of the original austenite grain increases gradually and so does the content of lath microstructures.

Keywords

Laser-MIG hybrid welding X80 pipeline steel Microstructure HAZ 

Notes

Funding information

This research was supported by National Natural Science Foundation of China (No. 51674056 and 51575401), the Scientific and Technological Research Program of Chongqing Municipal Education Commission (No. KJ1713344), the State Key Lab of Advanced Welding and Joining at Harbin Institute of Technology (No. AWJ-M15-05), and the Opening Project of Materials Corrosion and Protection Key Laboratory of Sichuan Province (No. 2016CL15).

References

  1. 1.
    Gook S, Gumenyuk A, Rethmeier M (2014) Hybrid laser arc welding of X80 and X120 steel grade. Sci Technol Weld Join 19(1):15–24CrossRefGoogle Scholar
  2. 2.
    Grünenwald S, Seefeld T, Vollertsen F, Kocak M (2010) Solutions for joining pipe steels using laser-GMA-hybrid welding processes. Phys Procedia 5:77–87CrossRefGoogle Scholar
  3. 3.
    Lei Z, Tan C, Chen Y et al (2013) Microstructure and mechanical properties of fiber laser-metalactive gas hybrid weld of X80 pipeline steel. J Press Vessel Technol Trans ASME 135(1):011403Google Scholar
  4. 4.
    Moore PL, Howse DS, Wallach ER (2004) Microstructures and properties of laser/arc hybrid welds and autogenous laser welds in pipeline steels. Sci Technol Weld Join 9(4):314–322CrossRefGoogle Scholar
  5. 5.
    Mohseni P, Solberg JK, Karlsen M, Akselsen OM, Østby E (2014) Cleavage fracture initiation at M–A constituents in intercritically coarse-grained heat-affected zone of a HSLA steel. Metall Mater Trans A 45(1):384–394CrossRefGoogle Scholar
  6. 6.
    Chen XZ, Fang YY, Li P, Zhenzhen Y et al (2015) Microstructure, residual stress and mechanical properties of a high strength steel weld using low transformation temperature welding wires. Mater Des 65:1214–1221CrossRefGoogle Scholar
  7. 7.
    Ivanov AY, Sulyagin RV, Orlov VV, Kruglova AA (2012) Formation of structure in the heat-affected zone and properties of welded joints of pipe steels of strength classes X80 and X90. Metal Sci Heat Treat 53(11–12):560–566CrossRefGoogle Scholar
  8. 8.
    Di XJ, Cai L, Xing XX et al (2015) Microstructure and mechanical properties of intercritical heat-affected zone of X80 pipeline steel in simulated in-service welding. Acta Metall Sin 28(7):883–891CrossRefGoogle Scholar
  9. 9.
    Gianetto J A, Fazeli F, Chen Y, et al (2014) Microstructure and toughness of simulated grain coarsened heat affected zones in X80 pipe steels[C]// 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, V003T07A035-V003T07A035Google Scholar
  10. 10.
    Witek M (2015) Possibilities of using X80, X100, X120 high-strength steels for onshore gas transmission pipelines. J Nat Gas Sci Eng 27:374–384CrossRefGoogle Scholar
  11. 11.
    Pouraliakbar H, Pouraliakbar H, Pouraliakbar H et al (2014) Predictions of toughness and hardness by using chemical composition and tensile properties in microalloyed line pipe steels. Neural Comput Appl 25(7–8):1993–1999Google Scholar
  12. 12.
    Shinohara Y, Madi Y, Besson J (2016) Anisotropic ductile failure of a high-strength line pipe steel. Int J Fract 197(2):127–145CrossRefGoogle Scholar
  13. 13.
    Inose K, Kanbayashi J, Abe D, Matsumoto N, Nakanishi Y (2013) Design and welding method for high-strength steel structure using laser-arc hybrid welding. Weld World 57(5):657–664CrossRefGoogle Scholar
  14. 14.
    Pan Q, Mizutani M, Kawahito Y, Katayama S (2016) Effect of shielding gas on laser–MAG arc hybrid welding results of thick high-tensile-strength steel plates. Weld World 60(4):653–664CrossRefGoogle Scholar
  15. 15.
    Zhang W, Hua X, Liao W, Li F, Wang M (2014) Behavior of the plasma characteristic and droplet transfer in CO 2, laser–GMAW-P hybrid welding. Int J Adv Manuf Technol 72(5–8):935–942CrossRefGoogle Scholar
  16. 16.
    Li R, Yue J, Sun R et al (2016) A study of droplet transfer behavior in ultra-narrow gap laser arc hybrid welding. Int J Adv Manuf Technol 87(9–12):1–12Google Scholar
  17. 17.
    Lan L, Chang Z, Kong X, Qiu C, Zhao D (2017) Phase transformation, microstructure, and mechanical properties of X100 pipeline steels based on TMCP and HTP concepts. J Mater Sci 52(3):1661–1678CrossRefGoogle Scholar
  18. 18.
    Nafisi S, Arafin MA, Collins L, Szpunar J (2012) Texture and mechanical properties of API X100 steel manufactured under various thermomechanical cycles. Mater Sci Eng A 531(5):2–11CrossRefGoogle Scholar
  19. 19.
    Costa A, Quintino L, Yapp D et al (2009) Characterization of fiber laser welds in X100 pipeline steel. Mater Des 30(7):2701–2707CrossRefGoogle Scholar
  20. 20.
    Yang JH, Liu QY, Sun DB et al (2010) Microstructure and transformation characteristics of acicular ferrite in high niobium-bearing microalloyed steel. J Iron Steel Res Int 17(6):53–59CrossRefGoogle Scholar
  21. 21.
    Yu QB (2012) Effect of cooling rate on microstructures and mechanical properties of X80 pipeline steel. Adv Mater Res 535-537:525–528CrossRefGoogle Scholar
  22. 22.
    Silva RDA, Souza LFGD, Morales EV, Rios PR, Bott IS (2015) Formation of microphases and constituents from remaining austenite decomposition in API X80 steel under different processing conditions. Mater Res 18(5):908–917CrossRefGoogle Scholar
  23. 23.
    Han XL, Wu DY, Min XL et al (2016) Influence of post-weld heat treatment on the microstructure, microhardness, and toughness of a weld metal for hot bend. Metals - Open Access Metall J 6(4):75Google Scholar
  24. 24.
    Lan L, Qiu C, Zhao D, Gao X, Du L (2012) Analysis of martensite–austenite constituent and its effect on toughness in submerged arc welded joint of low carbon bainitic steel. J Mater Sci 47(11):4732–4742CrossRefGoogle Scholar
  25. 25.
    Chen XW, Qiao GY, Han XL, Wang X, Xiao FR, Liao B (2014) Effects of Mo, Cr and Nb on microstructure and mechanical properties of heat affected zone for Nb-bearing X80 pipeline steels. Mater Des 53(1):888–901CrossRefGoogle Scholar
  26. 26.
    Isasti N, Jorge-Badiola D, Taheri ML, Uranga P (2013) Phase transformation study in Nb-Mo microalloyed steels using dilatometry and EBSD quantification. Metall Mater Trans A 44(8):3552–3563CrossRefGoogle Scholar

Copyright information

© International Institute of Welding 2018

Authors and Affiliations

  • Limeng Yin
    • 1
    • 2
  • Jinzhao Wang
    • 1
  • Xizhang Chen
    • 3
  • Cheng Liu
    • 1
  • Arshad Noor Siddiquee
    • 4
  • Gang Wang
    • 1
  • Zongxiang Yao
    • 1
  1. 1.School of Metallurgy and Materials EngineeringChongqing University of Science and TechnologyChongqingChina
  2. 2.State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbinChina
  3. 3.School of Electrical and Mechanical EngineeringWenzhou UniversityWenzhouChina
  4. 4.Department of Mechanical EngineeringJamia Millia Islamia (A Central University)New DelhiIndia

Personalised recommendations