Abstract

The present study reports on the kinetics of borided AISI D3 steel. Boriding thermochemical treatment was carried out in a solid medium consisting of B₄C, SiC and KBF₄ powders mixture at 1123, 1173 and 1223 K for 2, 4 and 6 h, respectively. The boride layer was characterized by optical microscopy, X-ray diffraction technique and micro-Vickers hardness tester. X-ray diffraction analysis of boride layers on the surface of the steels revealed the existence of FeB, Fe₂B, CrB and Cr₂B compounds. The thickness of the boride layer increased with an increase of the boriding time and the temperature. The hardness of the boride compounds formed on the surface of the steels ranged from 1652 to 1984 HV_0.05, whereas Vickers hardness values of the untreated the steels was 608 HV_0.05. The boron activation energy (Q) was estimated as equal to 174.261 kJ/mol for the borided AISI D3 steel. The growth kinetics of boride layers forming on the borided AISI D3 steel was also analyzed.

中文翻译：

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AISI D3钢中硼原子扩散速率的研究

摘要

本研究报告了硼化AISI D3钢的动力学。在由B ₄ C，SiC和KBF ₄粉末混合物组成的固体介质中，分别于1123、1173和1223 K进行硼化热化学处理2、4和6 h。通过光学显微镜，X射线衍射技术和显微维氏硬度计对硼化物层进行表征。钢表面硼化物层的X射线衍射分析表明，存在FeB，Fe ₂ B，CrB和Cr ₂ B化合物。硼化物层的厚度随着硼化时间和温度的增加而增加。在钢表面形成的硼化物化合物的硬度范围为1652至1984 HV _0.05而未经处理的钢的维氏硬度值为608 HV _0.05。硼化AISI D3钢的硼活化能（Q）估计为174.261 kJ / mol。还分析了在硼化AISI D3钢上形成的硼化物层的生长动力学。