To study the effect of Mg addition on inhibiting weld heat affected zones (HAZ) austenite grain growth of Ti-bearing low carbon steels, two steels with and without Mg treated were prepared using a laboratory vacuum. The welding testing was simulated by Gleeble 3500 thermomechanical simulator. The performance of HAZ was investiga ted that the toughness was improved from 3.3 to 185 J by adding 0. 005%Mg (in mass percent) to the steel, and the fracture mechanism changed from cleavage fracture to toughness fracture. Through in-situ observation by a confocal scanning laser microscope, a significant result was found that the austenite grain of the steel with Mg treated was still keeping fine-grained structure after holding at 1 400℃ and lasting for 300 s. This inhibition of austenite grain growth was mainly attributed to the formation of pinning particles after the addition of Mg. The obtained results pro pose a potential method for improving HAZ toughness of structure steels.
参考文献
[1] | Kojima A;Koshii K;Hada T.Development of High HAZ Toughness Steel Plates for Box Column With High Heat Input Welding[J].NIPPON STEEL TECHNICAL REPORT,2004(380):33. |
[2] | YANG Jian;ZHU Kai;WANG Guo-dong.Progress in the Technological Development of Oxide Metallurgy for Manufae turing Steel Plates With Excellent HAZ Toughness[J].Baost eel Technical Research,2008(04):43. |
[3] | Tomita T;Saitoh N;Tsuzuki T et al.Improvement in HAZ Toughness of Steel by TiN MnS Addition[J].ISIJ International,1994,34(10):829. |
[4] | Yamamoto K;Hasegawa T;Takamura J .Effect of Boron on the Intragranular Ferrite Formation in Ti-Oxides Bearing Steels[J].Tetsu To Hagane-Journal of the Iron and Steel Institute of Japan,1993,79(10):11-69. |
[5] | H.Mabuchi .The Role of Mn Depletion in Intra-Granular Ferrite Transformation in the Heat Affected Zone of Welded Joints with Large Heat Input in Structural Steels[J].ISIJ International,1996(11):1406-1412. |
[6] | Minagawa M;Ishida K;Funatsu Y.390 MPa Yield Strength Plate for Large Heat Input Welding for Large Container Ships[J].NIPPON STEEL TECHNICAL REPORT,2004(380):6. |
[7] | V.B. Trindade;R.S.T. Mello;J.C. Payao .Influence of Zirconium on Microstructure and Toughness of Low-Alloy Steel Weld Metals[J].Journal of Materials Engineering and Performance,2006(3):284-286. |
[8] | Ashby M F;Easterling K E .A First Report on Diagrams for Grain Growth in Welds[J].Acta Materialia,1982,30:1969. |
[9] | Yamamoto K.;Hasegawa T. .Effect of Boron on Intra-granular Ferrite Formation in Ti-Oxide Bearing Steels[J].ISIJ International,1996(1):80-86. |
[10] | Kojima A;Kiyose A;Uemori R.Super High HAZ Toug hness Technology With Fine Microstructure Imparted by Fine Particles[J].NIPPON STEEL TECHNICAL REPORT,2004(380):2. |
[11] | Ashby M;Easterling K .A First Report on Diagrams for Grain Growth in Welds[J].Acta Metallurgica,1982,30:1969. |
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