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Deoxidation of h13 tool steel with CaF_(2)-MgO-CaO-Al_(2)O_(3)-SiO_(2) slags at 1873 K

Journal of Central South University 2021年第2期28卷 370-385页

作者： LI Shao-ying LI Bin DUAN Sheng-chao ZhAO Xing-ming GUO Jing GUO han-jie School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Special Melting and Preparation of high-end Metal Materials Beijing 100083China Shandong Tianwu Forming Technology Co. Ltd.Liaocheng 252024China

Laboratory-scale experiments were performed to investigate the deoxidation of h13 tool steel with CaF_(2)-MgO-Al_(2)O_(3)-CaO-SiO_(2) slags at 1873 *** calculation of thermodynamics and kinetics was also verified through the experimental *** results show that[Si]-[O]reaction is the control reaction,and with the increase of basicity of slag,the limitation of deoxidation was *** limitation of deoxidation is the lowest for the slag with basicity of *** the conditions of the basicity of 2.0 and the content of CaF_(2) more than 50%,the limitation of deoxidation is less than 10×10^(−6),and it does not depend on the contents of Al_(2)O_(3) and CaF_(2) in *** mass transport of oxygen in the metal phase is the rate-controlling step,and the slag composition has no effect on the equilibrium time of *** on this finding,the optimized slag composition is designed and it contains the following components:51.5%CaF_(2),20.3%MgO,16.2%Al_(2)O_(3),8.2%CaO and 3.8%SiO_(2).In the case of the optimized deoxidizing slag,the total oxygen content in h13 steel can be reduced from 25×10^(−6) to 6×10^(−6).

关键词： deoxidation h13 tool steel slag-steel interface reaction slag optimization

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Microstructure and Properties of Low Temperature Composite Chromized Layer on h13 tool steel

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Journal of Materials Science & Technology 2005年第2期21卷 251-255页

作者： Cuilan WU, Chengping LUO and Ganfeng ZOU College of Mechanical Engineering, South China University of Technology, Guangzhou 510641, China Coll. of Mech. Eng. South China Univ. of Technol. Guangzhou 510641 China

Low temperature composite chromizing is a process composed of a plain ion-carbonitriding or ion-nitriding at 550-580℃, followed by a low-temperature chromizing in a salt-bath of 590℃. The microstructure and properties of the low temperature composite chromized layer on h13 tool steel were investigated using metallography, X-ray diffraction, microanalysis, hardness and wear tests. It was found that this low temperature process was thermo-dynamically and kinetically possible, and the composite chromized layer on h13 steel, with a thickness of 3-6 μm, consisted of three sub-layers (bands), viz. the outer Cr-rich one, the intermediate (black) one, and the inner, original white layer. After chromizing, the former diffusion layer was thickened. The results of X-ray diffraction showed that the composite chromized layer contained such nitrides and carbides of chromium as CrN, Cr2N, (Cr, Fe)23C6, and (Cr, Fe)7C3, as well as plain α-(Fe, Cr). A high surface microhardness of 1450-1550 hV0.025, which is much higher than that obtained by the conventional ion carbonitriding and ion nitriding, was obtained. In addition, an excellent wear resistance was gained on the composite chromized layer.

关键词： h13 tool steel Low temperature composite chromizing Nitride and carbide of chromium Microhardness Wear resistance

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