Effect of austempering on high temperature frictional wear property of Dievar hot working die steel

doi:10.13251/j.issn.0254-6051.2023.02.014

Abstract

Abstract: Mixed microstructure with different volume fractions of lower bainite and martensite was produced in Dievar steel by austempering, and then the high temperature frictional wear performance and mechanism of the Dievar steel were investigated based on the microstructure identification, hardness evaluation, worn surface morphology and wear rate analysis. The results show that the volume fraction of lower bainite in the Dievar steel increases with the increase of austempering time, where the bainitic volume fractions are 32%, 45% and 63% with isothermal holding for 3, 5 and 10 min respectively. Compared to the conventional oil quenched specimens, the specimens with the mixed microstructure have higher tempering resistance. The hardness values for austempered specimens are higher than that of oil quenched ones. In addition, the austempered specimens exhibit better wear resistance compared to the conventional oil quenched ones under the same wear condition. Under the high temperature friction and wear test conditions of 400-600 ℃, the surface oxides of the Dievar steel are Fe₂O₃ and Fe₃O₄. The high temperature wear mechanism at 400-500 ℃ for the Dievar steel is abrasive-slight oxidation wear. As the temperature increases, the size of oxide particles becomes larger and the abrasive wear is strengthened. When the temperature approaches to 600 ℃, the high temperature wear mechanism for the conventional oil quenched specimens is still maintained as abrasive-oxidation wear, mainly abrasive wear, however, it alters to the oxidation wear for the austempered specimens.

Key words: Dievar hot working die steel, austempering, bainite/martensite mixed microstructure, hardness, high temperature wear mechanism, high temperature wear property

CLC Number:

TG142.2

Yang Liu, Xie Yixin, Ju Yulin, Wei Qi, Cao Fuyang, Luo Rui, Yuan Zhizhong, Cheng Xiaonong. Effect of austempering on high temperature frictional wear property of Dievar hot working die steel[J]. Heat Treatment of Metals, 2023, 48(2): 85-93.

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