| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Lanthanum on Tempering Resistance and Oxidation Resistance of the H13 Die Steel |
| ZHAO Fan1,2,3, ZHOU Wenjian1,2, ZHANG Zhihao1,2,*
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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 |
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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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Published:
Online: 2023-02-08
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| Fund:National Natural Science Foundation of China (52101118), the Key Scientific and Technological Project of Foshan City (1920001000409) and State Key Laboratory of Materials Processing and Die & Mould Technology (P2021-002). |
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Corresponding Authors:
ntzzh2279@163.com
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2023, Vol. 37 
