Abstract
The microstructural evolution and mechanical properties of heat-affected zone of high-strength offshore structural steels was investigated. Micron and sub-micron complex Zr-Ti oxides were observed and evenly dispersed in the heat-affected zone. MnS was spheroidized and refined. The acicular ferrite grains formed on complex oxides in the heat-affected zone effectively partitioned austenite grains and thus refined microstructures. In the meantime, the low carbon content and suitable amount of Ni, Cr, Cu and Mo additions were adopted in the design of high-strength steels. Therefore, bainitic microstructure was obtained in the heat-affected zone within a large heat input welding range (25~100 kJ/cm). The V-notch impact absorbed energy (180 J) of the coarse-grained heat-affected zone for the steel plates welded by submerged arc welding at a heat input of 50 kJ/cm indicated that high-strength offshore structural steels had excellent impact toughness at -60°C.
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Lu WY, Wu KM, Wang HH, Lei XW, Yin YQ. The weldability of Zr-Ti microalloyed high-strength high-toughness structural steel. Transactions of the China Welding Institute 2012; 33(8):49–53.
Zhang H, Lei YT, Wei JS. Present situation and development tendency of the high strength hull structure steel . Steel Construction 2004; 19(2):38–41.
Wei R, Wu KM, Wang HH, Yao YK, Wang DY, Meng LD. The effect of Zr-Ti combined deoxidation on the microstructure and toughness in the coarse-grained region of heat-affected zone of high strength low alloy steels. Transactions of the China Welding Institute 2012; 33(10):71–76.
Wei R, Shang CJ, Wu KM. Grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed steels. International Journal of Minerals, Metallurgy and Materials 2010, 17(6):737–741.
Wan X L, Wei R, Wu KM. Effect of acicular ferrite formation on grain refinement in the coarse-grained region of heat-affected zone. Materials Characterization 2010; 61(7): 726–731.
Wei R, Wu KM. Microstructural analysis of weld metal microstructures in a low carbon high strength microalloyed steel. Transactions of the China Welding Institute 2010; 31(7):47–50.
Wang HH, Wu KM, Lei XW, Qian Y. Effect of fast cooling process on microstructure and toughness of heat affected zone in high strength pipeline steel X120. Science and Technology of Welding and Joining 2012; 17:309–313.
Sarma DS, Karasev AV, Jonsson PG. On the role of non-metallic inclusions in the nucleation of acicular ferrite in steels. ISIJ International 2009; 49(7): 1063–1074.
He KJ, Baker TN. Effect of zirconium additions on austenite grain coarsening of C-Mn and microalloy steels. Materials Science and Engineering A 1998; 256(1–2): 111–119.
Lee TK, Kim HJ, Kang BY, Hwang SK. Effect of inclusion size on the nucleation of acicular ferrite in welds. ISIJ International 2000; 40(12): 1260–1268.
Wan XL, Wang HH, Cheng L, Wu KM. The formation mechanisms of interlocked microstructures in HSLA steel weld metals. Material Characterization 2012; 67:41–51.
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Yin, Y.Q. et al. (2013). Microstructure Evolution in the Heat-Affected Zone of Zr -Ti Microalloyed High-Strength High-Toughness Offshore Structural Steels. In: Marquis, F. (eds) Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing. Springer, Cham. https://doi.org/10.1007/978-3-319-48764-9_97
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DOI: https://doi.org/10.1007/978-3-319-48764-9_97
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48586-7
Online ISBN: 978-3-319-48764-9
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