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| Influence of Ca treatment on application of rare earth in HAZ during high heat input welding progress |
| XIE Yu-min1,2, SONG Ming-ming1,2, MEN Chao-qi1,3, ZHU Hang-yu1,2, MA Guo-jun1,2, XUE Zheng-liang1,3 |
1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
2. Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
3. Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China |
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Abstract To make clear the influence of Ca treatment on the effect of Rare Earth (RE) to improve the toughness of Heat Affected Zone (HAZ) in C-Mn steel,Gleeble was used to simulate the welding thermal cycle process with a heat input of 339 kJ/cm. The differences in inclusion,microstructure and low-temperature impact toughness in HAZ between RE treated steel and Ca-RE treated steel were compared. At last,the influence of Ca on the role of RE in HAZ was studied. It was found that Ca can promote the function of RE to improve the low temperature impact toughness in HAZ. The inclusions in HAZ of RE treated steel transformed from complex inclusions containing RExOy to that of RE and Ca when treated with Ca,thereby decreasing the total amount of inclusions. Ca treatment also resulted in the increase in the mean size of the inclusions from 1.5 to 2.2 μm,while a decrease in the aspect ratio from 1.5 to 1.4. Although Ca had little effect on the content of acicular ferrite in HAZ of RE-treated steel,however,the inhibition of RE on prior austenite grain coarsening in HAZ was enhanced by Ca treatment,with a smaller grain size than that of the RE treated steel. The low-temperature impact toughness in HAZ of RE treated steel was obviously improved by Ca treatment When the heat input was 339 kJ/cm.
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Received: 14 August 2020
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2021, Vol. 56 
