Alternating current field enhanced pack aluminum-carbonitriding of commercial pure titanium TA2

doi:10.13251/j.issn.0254-6051.2024.10.044

Abstract

Abstract: Alternating current field(ACF) enhanced pack aluminum-carbonitriding was carried out at 750 ℃ for commercial pure titanium TA2. The microstructure, phase structure, thickness and microhardness distribution along the case depth of the treated specimens were analyzed by means of optical microscopy, X-ray diffraction and microhardness test. The results show that the case obtained with the help of the ACF with a current of 2 A consists of TiN, Ti₂N and a small amount of AlTi₃. As the ACF current gradually increases from 2 A to 6 A, Ti₃AlN and C_0.3N_0.7Ti are found in the surface layer, and the amount of TiN and Ti₂N disappear, while AlTi₃ always exists. No aluminum-containing phase is detected in the surface layer of TA2 treated by conventional pack aluminum-carbonitriding with the same agent, temperature and time used for the ACF enhanced treating. The ACF has a significant promoting effect on the pack aluminum-carbonitriding. The promoting effect increases with the increase of the ACF current. Applying an electric field with a current of 6 A can produces a case with a thickness about 40 μm. The ACF also increases the case's peak hardness and overall hardness along the case's depth.

Key words: commercial pure titanium TA2, pack aluminum-carbonitriding, alternating current field

CLC Number:

Han Aiyu, Xie Fei. Alternating current field enhanced pack aluminum-carbonitriding of commercial pure titanium TA2[J]. Heat Treatment of Metals, 2024, 49(10): 272-277.

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