발간논문

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Vol.34, No.4, 498 ~ 506, 1996
Title
Research Paper - Surface Treatment - : A Study on the Boronizing Treatement of STD61 Steel by the Paste Method
차병묵Byoung Mook Cha, 손명숙Myung Sook Son, 윤재홍Jae Hong Yoon, 남기석Kee Seok Nam
Abstract
STD 61 steel was boronized in Boronizing paste mainly consisted of B₄C and Na₂B₄O_7 at various temperatures and times. Microhardness and thickness of boride layers were measured and distributions of B, Si, Cr, and V on the cross section of specimens were observed by EPMA line analysis. Microscopic examination and results of EPMA showed that the boride layer consisted of two layers outer layer of FeB and inner layer of Fe₂B. Microhardness of these boride layers was in the range of Hv 1800∼2300. Thickness of the boride layer increased with a square root of time for treatment at constant temperature. Activation energy for diffusion of B in the specimen obtained from the slope of Arrhenius plots was 260kJ/㏖. Si-rich α layer was formed between boride layer and matrix. Element such as Cr concentrated as Cr_(23)(B, C)_6 beneath the boride layer.
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