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.
This is a preview of subscription content, log in to check access.
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.
Joonoh Moon, Chang-Hoon Lee, Tae-Ho Lee et al., Effect of heat input on microstructure evolution and mechanical properties in the weld heat-affected zone of 9Cr-2 W-VTa reduced activation ferritic-martensitic steel for fusion reactor. Metall. Mater. Trans. A 46, 156–163 (2015)CrossRefGoogle Scholar
Qiangguo Zhou, Wenfeng Zhang, Wei Yan et al., Microstructure and mechanical properties of a nitride-strengthened reduced activation ferritic/martensitic steel. Metall. Mater. Trans. A 43, 5079–5087 (2012)CrossRefGoogle Scholar
Yina Huang, Farong Wan, Xin Xiao et al., Microstructure change in deuterium implanted CLAM steel induced by electron irradiation. Sci. China Phys. Mech. Astron. 54, 111–114 (2011)CrossRefADSGoogle Scholar
Yuming Huang, Xizhang Chen, Zheng Shen, Bruce Madigan, Lei Yucheng, Jianzhong Zhou, Measurement and analysis of SHCCT diagram for CLAM steel. J. Nucl. Mater. 432, 460–465 (2013)CrossRefADSGoogle Scholar
Chen Xizhang, Shen Zheng, Li Peng et al., Compatibility of CLAM steel weldments with static LiPb alloy at 550 °C. Fusion Eng. Des. 87, 1565–1569 (2012)CrossRefGoogle Scholar
Xizhang Chen, Zheng Shen, Xing Chen, Yucheng Lei, Qunying Huang, Corrosion behavior of CLAM steel weldment in flowing liquid Pb-17Li at 480 °C. Fusion Eng. Des. 86, 2943–2948 (2011)CrossRefGoogle Scholar
Qiang Zhu, Yu-cheng Lei, Xi-zhang Chen, Wen-jie Ren, Ju Xin, Yi-min Ye, Microstructure and mechanical properties in TIG welding of CLAM steel. Fusion Eng. Des. 86, 407–411 (2011)CrossRefGoogle Scholar
H. Serizawa, S. Nakamura, H. Tanigawa et al., Measurement and numerical analysis of welding residual stress in box structure employed for breeder blanket system of ITER. Weld. World 55, 48–55 (2011)CrossRefGoogle Scholar
C. Li, Q. Huang, P. Zhang et al., Preliminary experimental study on Hot Isostatic Pressing diffusion bonding for CLAM/CLAM. Fusion Eng. Des. 82, 2627–2633 (2007)CrossRefGoogle Scholar
J. Oñoro, Weld metal microstructure analysis of 9–12 %Cr steels. Int. J. Press. Vessels Pip. 83, 540–545 (2006)CrossRefGoogle Scholar
J. Oñoro, Martensite microsture of 9–12 %Cr steels weld metals. Mater. Process. Technol. 180, 137–142 (2006)CrossRefGoogle Scholar
T. Shibayama, A. Kimura, H. Kayano, The effect of small additional elements on the precipitation of reduced activation Fe-9Cr-2 W steels. J. Nucl. Mater. 233–237, 270–275 (1996)CrossRefGoogle Scholar
Xiang Xiao, Guoquan Liu, Hu Benfu et al., Coarsening behavior for M23C6 carbide in 12%Cr-reduced activation ferrite/martensite steel: experimental study combined with DICTRA simulation. J. Mater. Sci. 48, 5410–5419 (2013)CrossRefADSGoogle Scholar
Y. Lei, Q. Zhu, L. Zhang, K. Gu, X. Ju, Simulation on the welding of CLAM steel. Fusion Eng. Des. 85, 1503–1507 (2010)CrossRefGoogle Scholar