Effect of Lanthanum on Tempering Resistance and Oxidation Resistance of the H13 Die Steel
ZHAO Fan1,2,3, ZHOU Wenjian1,2, ZHANG Zhihao1,2,*
1 Key Laboratory for Advanced Materials Processing (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China 3 State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract: In this work, the effect of La contents on tempering resistance and oxidation resistance of H13 die steels was studied at extreme service temperature. With the La content increasing from 0% to 0.570%, the decrement in hardness after heating at 620 ℃ for 50 h first decreased and then increased. Addition of 0.052%La inhibited the aggregation and growth of carbides and resulted in the highest tempering resistance. However, addition of 0.570%La inhibited the recrystallization of ferrite and resulted in coarser ferrite grains with lath shape, thus reducing the tempering resistance of H13 hot working die steels. The effect of La-microalloying on tempering resistance of H13 hot working die steels was mainly reflected in the evolution of ferrite grains and carbides, because addition of 0.052%La just increased the dislocation density slightly. With the La content increasing from 0% to 0.094%, the oxidation layer of H13 steel after heating at 650 ℃ for 100 h became more smooth and compact, and its depth decreased from 48.4 μm to 30.6 μm. Moreover, La addition promoted the formation of acicular oxides and weakened the internal oxidation.
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