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Calculation and Analysis of Valence Electron Structure of Mo_2C and V_4C_3 in hot working die steel

Journal of Iron and steel Research International 2006年第1期13卷 50-56页

作者： LIU Yan LIU Zhi-lin ZHANG Cheng-weit College of Material and Chemical Engineer Liaoning Institute of Technology Jinzhou 121001 Liaoning China China National Oil and Gas Exploration and Development Corporation Beijing 100011 China

Taking the hot working die steel （HWDS） 4Cr3Mo2NbVNi as an example, the phase electron structures （PES） and the biphase interface electron structures （BIES） of Mo2C and V4 C3 , which are two kinds of important carbides precipitated during tempering in steel were calculated, on the basis of the empirical electron theory of solids and molecules and the improved TFD theory. The influence of Mo2 C and V4 C3 on the mechanical properties of HWDS has been analyzed at electron structure level, and the fundamental reason that the characteristic of the PES and the BIES of carbides decides the behavior of them has been revealed.

关键词： phase structure factor interface conjunction factor hot working die steel carbide

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Inclusion Variations of hot working die steel H13 in Refining Process

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Journal of Iron and steel Research International 2012年第11期19卷 1-7页

作者： LIU Jian-hua WANG Guo-xuan BAO Yan-ping YANG Yan YAO Wei CUI Xiao-ning Metallurgical Engineering Institute University of Science and Technology BeijingBeijing 100083China Technical Center Zhongyuan Special Steel Co LtdJiyuan 454685HenanChina

Inclusion variations of die steel H13, including changes of species, morphologies, compositions, amounts and sizes, in the production of EAF-LF--VD-ingot casting-electro slag refining （ESR） procedure, were investi- gated by systematic sampling, and analyzed with scanning electron microscope （SEM）, energy dispersive spectrum （EDS） , and metallographic microscope. The variation mechanism was studied by comprehensive analysis of total oxygen, nitrogen, and acid soluble aluminum as well as chemical test of refining slag. Based on the investigations, technical measures for cleanness improvement were discussed. The resuhs show that oxide inclusions in H13 steel change from irregular Al2O3- near globular CaO-MgO-Al2O3 and CaO-Al2O3-SiO2 complex inclusions-finer CaO- Al2O3-SiO2 inclusions with higher CaO content-CaO-Al2O3-SiO2 inclusions with higher Al2O3 content and irregular MgO-AI203 inclusions--fine irregular MgO-Al2O3-CaS inclusions in various steps of the production; the variations are related with changes of acid soluble aluminum content, reactions between slag and steel, re-oxidation of liquid steel during casting, and refining of ESR. It is also found that Al2O3 inclusions are modified by refining slag in LF and VD refining~ and ESR plays a good role in inclusion removal, especially in controlling the large linear VC-CrC- MoC inclusions distributed in grain boundaries. It is suggested that casting protection should be improved, and the basicity of refining slag and acid soluble aluminum content in steel should be raised.

关键词： hot working die steel ESR cleanness refining slag modification

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维普期刊数据库

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Microstructure and Properties of hot working die steel H13MOD

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Journal of Iron and steel Research International 2013年第9期20卷 117-125页

作者： ZHOU Jian MA Dang-shen CHI Hong-xiao CHEN Zai-zhi LI Xiang-yang Central Iron and steel Research Institute

Compared with H13 steel, the influences of different heat treatment process on the microstructure and properties of the new type of hot working die steel H13MOD were studied. The results show that the complete aus tenitizing temperature of H13MOD is around 1030 ℃ and the quenching hardness achieves the maximum value at this temperature. While for H13, the complete austenitizing temperature is above 1100 ℃ and the quenching hardness rise constantly with the quenching temperature increasing. In quenching process, the undissolved MC carbides can prevent the coarsening of grain in both steels. With the rise of quenching temperature, when MC carbides dissolve completely, the grain grows quickly. The hardness and strength of H13MOD at higher tempering temperature （above 570 ℃） are nearly the same as those of H13, but its toughness is higher than that of H13. Mo2C carbide is the main strengthening phase in H13MOD, which is attributed to the higher content of Mo. The quantity of VC eutectic car- bides is reduced because of lower content of V in H13MOD, which plays an important role in enhancing the impact toughness of H13MOD. Under a certain strength condition, H13MOD steel can be used in the environment that higher toughness is required and the service life of die casting mold can be improved.

关键词： hot working die steel hardness heat treatment impact ductility tensile strength

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