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《Journal of University of Science and Technology Beijing》 2008-11
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Effect of micro-zirconium addition on the carbonitride precipitation and austenite grain coarsening in Mn-Mo-Cu-Nb-B structure steel

GUO Jia1),SHANG Chengjia1),GUO Aimin1,2),GUO Hui1),YANG Shanwu1),HE Xinlai1)1) School of Material Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2) Technology Center of Wuhan Iron and Steel (Group) Co.,Wuhan 430080,China  
Low carbon Mn-Mo-Nb-Cu-Zr-B steel was designed,which was processed by thermo-mechanical controlling and cooled at medium cooling rate,and the microstructures including an abundant of lath bainite,a number of granular bainite and a bit of acicular ferrite were obtained.The yield strength of the as-rolled steel plate exceeds the 850 MPa grade,which meets the need for the mechanical properties of X120 pipe line steel.As 0.015% Zr (mass faction) was added in the steel,a number of complex Zr-bearing carbonitrides with irregular shape were observed by TEM,and their size ranged from 80 nm to 200 nm;considering anomalous shape,they formed at high temperature and had high melting points.The size of Zr-bearing precipitates would reduce when the reheat temperature exceeded 1 200 ℃ because of some amounts of Ti and Nb in the precipitates dissolving,which is better for controlling the austenite grain coarsening.Whereas,quasi-elliptic Zr-free carbonitrides would dissolve even vanish when reheating.Zr-bearing precipitates distributing evenly can block the moving of grain boundaries effectively when reheating,which is the predominant reason that the tendency of austenite grain growth of Zr-bearing steel is lower than that of Zr-free steel.A conclusion should be obtained that 0.015% Zr (mass fraction) addition can improve the weld properties of low carbon Mn-Mo-Nb-Cu-Zr-B steel.
【Fund】: 国家高技术研究发展计划资助项目(No.2003AA331020)
【CateGory Index】: TG161
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