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Journal of Fusion Energy

, Volume 34, Issue 5, pp 995–1001 | Cite as

Microstructure and Stress Distribution on TIG Welded Joint of CLAM Steel

  • Qiang Zhu
  • Yucheng Lei
  • Yunlong Wang
  • Shenyong Liang
  • Yimin Ye
  • Changsheng Li
Original Research

Abstract

China low activation martensitic steel, 5 mm, were butt-welded in tungsten insert gas welding. Mechanical properties and microstructure in joints were studied in detail. The residual stress and deformation in the joints were numerically simulated using finite element method. Hardening at WM and softening in heat affected zone is detected in weld joint. The tensile specimen always undergoes localized necking and breaks in BM when the temperature of PWHT was lower than 800 °C. Until PWHT was done at 760 °C/30 min, the specimen ductile fractured in local area, but the absorbed energy of each CIT specimen is much lower than that of BM. The microstructure in WM is mainly tempered martensite with a little of delta ferrite. Tempered lath martensite containing dislocations and M23C6 carbides is the primary structural feature. According to the results of numerical studies, angular distortion is the main form of residual deformation, and caused by the transverse shrinkage of WM.

Keywords

CLAM steel TIG Mechanical properties Microstructure Residual stress Deformation 

Notes

Acknowledgments

This work is supported by the China National Natural Science Foundation with Grant No. 51375216, and the Open-Fund Research of State Key Lab of Advanced Welding and Joining with Grant No. AWJ-Z13-01, and Foundation for Advanced Talents of Jiangsu University with Grant No. 13JDG008.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.School of Material Science and EngineeringJiangsu UniversityZhenjiangChina
  2. 2.State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbinChina
  3. 3.Institute of Advanced MaterialJiangsu UniversityZhenjiangChina

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