Diffusion Kinetics and Characterization of Fe2B Coatings Grown Thermochemically on Steel ASTM A709

被引：0
作者：
M. Ortiz-Dominguez
M. Keddam
机构：
[1] Universidad Autónoma del Estado de Hidalgo,
[2] Escuela Superior de Ciudad Sahagún-Ingeniería Mecánica,undefined
[3] Laboratory of Materials Technology,undefined
[4] Faculty of Mechanical Engineering and Process Engineering,undefined
[5] USTHB,undefined
来源：
Metal Science and Heat Treatment | 2024年 / 65卷
关键词：
boriding; diiron boride; growth kinetics; microstructure; integral method; activation energy;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The study is devoted to pack-powder boriding of ASTM A709 steel in a powder mixture containing boron carbide, potassium fluoroborate and silicon carbide. This surface hardening process is conducted between 1123 and 1273 K for from 2 to 8 h. The formed diiron boride layers are studied by different techniques (scanning electron microscopy, x-ray diffraction (XRD) analysis, glow discharge optical emission spectroscopy (GDOES), Vickers microhardness testing, surface profilometry, Rockwell-C indentation cohesion and pin-on-disc tests). Kinetically, an integral-method-based approach is applied to calculate the boron diffusivities in Fe2B. The activation energy of the process is deduced and compared to reported data. The same model is ultimately verified by comparing the empirical values of the thickness of the Fe2B layers obtained at 1223 K and 1273 K for 9 h and the predicted values.
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页码：538 / 546
页数：8
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