Combat molten aluminum corrosion of AISI H13 steel by low-temperature liquid nitrocarburizing

JOURNAL OF ALLOYS AND COMPOUNDS

卷:776

Article

Chen, Guang¹  Wang, Jun¹  Fan, Hongyuan¹  Wang, Danqi²  Li, Xiaoying³  Dong, Hanshan³ 

[1] Sichuan Univ, Sch Mfg Sci & Engn, Chengdu 610065, Sichuan, Peoples R China

[2] Case Western Reserve Univ, Swagelok Ctr Surface Anal Mat, 10900 Euclid Ave, Cleveland, OH 44106 USA

[3] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

关键词: AISI H13 steel;    Low-temperature liquid nitrocarburizing;    Molten aluminum corrosion resistance;    Microstructure;    Kinetics;   

DOI  :  10.1016/j.jallcom.2018.10.298

来源: Elsevier

【 摘 要 】

Possibility of improving the resistance of AISI H13 steel to molten aluminum corrosion by liquid nitro-carburizing (LNC) was explored. The effects of the LNC parameters in terms of temperatures (703/723/743 K) and soaking time (4/8/12 h) on phase transformation, microstructure, and resistance to molten aluminum were fully studied. The surface phase compositions and the cross-sectional phase distribution of the LNC treated specimens were studied by implementable X-ray diffraction analysis. Microstructure, element distribution, microhardness, and the kinetics of the nitrocarburized case formation were fully researched. Immersion test of corrosion resistance to molten aluminum was carried out at 1023 K for 30min. It is observed that an oxide layer can be produced on the top of the nitrocarburized case during LNC treatment, which cannot be regularly produced by other nitriding methods. The nitrocarburized case consists of a compound layer, a diffusion layer, and a transition layer. The growth of the nitrocarburized case is proportional to the squared treatment time and follows the Arrhenius law for the treatment temperature. The activation energy is estimated to be 195.4 kJ mol(-1). While the nitrocarburized case provided limited resistance to molten aluminum, the oxide layer formed on the top of the nitrocarburized case conferred significantly improved molten aluminum corrosion resistance, especially a duplex oxide layer produced at 743 K. (C) 2018 Elsevier B.V. All rights reserved.

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