Abstract
Conventional pack boriding (CPB) has shortcomings of high processing temperature and long pro- cess duration for producing boride coating with an effective thickness. Alternating current field enhanced pack bo- riding (ACFEPB) is a new approach for overcoming those shortcomings in CPB. In the present work, ACFEPB was carried out on a 45 medium carbon steel at low and medium temperatures (450~800 ℃) by applying a 50 Hz alternating current field (ACF) during the pack boriding for revealing effects of ACF on the treatment. Understand- ing characterization of the ACFEPB better will lay a good foundation for investigating the mechanism of the ACF on the boriding and optimizing the new process. Experimental results showed that nearly same thick boride coat- ings were obtained in target surface of samples located in different positions right between the parallel ACF elec- trodes, while less thick boride coatings were found in samples not within the region. All ACFEPB samples' boride
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