The Influence of an Alternating Current Field on Pack Boriding for Medium Carbon Steel at Moderate Temperature
Source abstract
Abstract
The influence of alternating current (AC) field on the pack boriding process for medium carbon steel was investigated through characterization of microstructure, phase composition, microhardness, and corrosion resistance of the boride layer and its mechanism was revealed. Results showed that the boride layer obtained by AC field boriding was composed of the outer FeB and the inner Fe2B phase, which was similar to that of conventional boriding. Meanwhile, the effective thickness of the boride layer and proportion of Fe2B increased gradually with increasing current during AC field boriding. The introduction of an AC field during the boriding process served dual purposes. First, it facilitated the decomposition of the boriding medium, leading to an elevation in the concentration of active boron atoms. Second, it reduced the activation energy required for atomic diffusion, thereby accelerating the diffusion of both boron and iron atoms. These combined effects significantly enhanced the hardness distribution and corrosion resistance of the steel. Further insights into the process were gained by fitting the parabolic kinetics curves, which confirmed that the boriding process in an AC field was exclusively controlled by diffusion. This study also clarified the growth mechanism of the boride layer within an AC field.
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Research context
OpenAlex topics: Metal Alloys Wear and Properties · Advanced materials and composites · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical and Energy Engineering, Zhejiang University of Science and Technology, Hangzhou 310014, China
School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210097, China
Key Laboratory of Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technology of Zhejiang Province, Hangzhou 310024, China
Jiangsu JITRI Advanced Energy and Materials Research Institute Co., Ltd., Changzhou 213032, China
School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
Funding
National Natural Science Foundation of China · China Postdoctoral Science Foundation · Changzhou City In-ternational Cooperation Project · Zhejiang University of Science and Technology · Key Laboratory of Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technology of Zhejiang Province
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