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Wu J.,Dongfeng Investment Casting Co. | Zhou G.,Xian Jiaotong University
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

Influence of adding method and content of rare earth on microstructure and properties of the high strength cast steel was researched by microstructure observation and mechanical property analysis. The results show that suitable amount of rare earth alloy added into the melt steel after deoxidization can reduce the inclusions and improve their morphology and the microstructure as well as the mechanical properties of the cast steel. The optimum additive is 300 g RE-Si alloy per 100 kg melting steel. Source

Liu J.-G.,Dongfeng Investment Casting Co. | Zeng D.-X.,Hubei University of Automotive Technology
Zhuzao/Foundry | Year: 2014

In recent years, study on the ductile iron with high strength and high elongation and the development of production technology received attention of related research institutions. Through experiment, the feasibility of developing as-cast QT700-10 technology was discussed by using a series of production processes such as reasonable composition design, molten iron purification, multi-element alloy solid solution strengthening, grain refinement, etc. Source

Liu J.-G.,Dongfeng Investment Casting Co.
Zhuzao/Foundry | Year: 2013

Energy saving of the traditional precision casting was discussed in this article. Through the research and application of such technology as lightweight design of precision castings, rebuilding roasting furnaces, improving production rate by optimizing modular group and shell-strengthening with less layers, the concept of the energy system optimization was put forward, which can be a reference for traditional precision casting enterprises to develop energy-saving and emission reduction. Source

Xiao H.,Dongfeng Investment Casting Co. | Yuan J.,Dongfeng Investment Casting Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

Through canceling normalizing before the traditional quenching and tempering process on ZG45 and ZGD650-830, influence of quenching + high temperature tempering process on the mechanical properties and microstructure of investment casting steel was analyzed. The results show that the mechanical properties and the microstructure of the investment steel casting after quenching at (920 ± 10)°C and high temperature tempering at (660 ± 10)°C Care near to those of normal tempering steel castings, which could replace completely the traditional tempering process, meeting control standard. Source

Xiao H.,Dongfeng Investment Casting Co. | Lan Y.,Dongfeng Investment Casting Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

The casting defects and the structure as well properties of investment casting steel parts were investigated at different vibration conditions, and the casting defects, mechanical properties and micro-structure of the casting were analyzed. The results show that proper vibration technology may not refine grain sizes and improve the mechanical properties, however it could effectively reduce casting slag holes and decrease the crack and the shrinkage porosity tendency as well as improving casting quality in the casting and solidification process. Source

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