In-situ research on microstructure refining effect of Mg treatment for shipbuilding steel at high temperature
SUN Li-gen1,2, LEI Ming1, ZHANG Xin1, LIU Yun-song1, ZHU Li-guang2,3
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China;
2. Hebei Engineering Research Center of High Quality Steel Continuous Casting, Tangshan 063000, Hebei, China;
3. Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China
Abstract：With Mg treatment process,the welded heat affected zone performance of shipbuilding steel is significantly improved. To further clarify the mechanism of action of Mg,the microstructure evolution of the traditional shipbuilding steel and Mg treated shipbuilding steel during the temperature rise and fall process was observed by high temperature laser confocal microscopy,and the phase transformation of the steel structure during continuous cooling with different holding time was also studied. By comparison,it is found that the austenite grain size was not coarsened due to the pinning action of the fine inclusion particles for Mg treatment during heating process,and a large amount of IAF(intragranular acicular ferrite) were induced by inclusions inside the austenite grains during the cooling process also. The both effects caused the steel structure to be further refined,and the inclusions,which induced the IAF,exhibit a law of increasing gradually with the prolongation of the holding time. At the same time,statistics on the number and distribution of inclusions also provide strong evidence for the above results.
孙立根, 雷鸣, 张鑫, 刘云松, 朱立光. 镁处理对船体钢组织细化作用的高温原位分析[J]. 钢铁, 2020, 55(5): 94-102.
SUN Li-gen, LEI Ming, ZHANG Xin, LIU Yun-song, ZHU Li-guang. In-situ research on microstructure refining effect of Mg treatment for shipbuilding steel at high temperature. Iron and Steel, 2020, 55(5): 94-102.
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2020, Vol. 55 
