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Application of Artificial Neural Network to Predicting Hardenability of Gear Steel

GAO Xiuhua , QI Kemin , DENG Tianyong , QIU Chunlin , ZHOU Ping , DU Xianbin

钢铁研究学报(英文版)

The prediction of the hardenability and chemical composition of gear steel was studied using artificial neural networks. A software was used to quantitatively forecast the hardenability by its chemical composition or the chemical composition by its hardenability. The prediction result is more precise than that obtained from the traditional method based on the simple mathematical regression model.

关键词: artificial neural network (ANN);gear steel;hardenability;20CrMnTiH

Dynamic and Static Recrystallization Behavior of Low Carbon High Niobium Microalloyed Steel

LAN Liangyun , QIU Chunlin , ZHAO Dewen , GAO Xiuhua , DU Linxiu

钢铁研究学报(英文版)

The recrystallization behavior of a low carbon high Nb microalloyed steel was investigated using Continuous and interrupted hot compression tests. The results showed that the onset of dynamic recrystallization (DRX) could be detected from inflection in the plot of the strain hardening rate θ against stress σ regardless of whether the stress peak appears or not. According to Zener-Hollomon parameter the activity energy of DRX (Qdef) was obtained, and a new modified expression calculating Qdef was proposed in consideration of the chemical composition of experimental steel. Applying the 2% offset method the static softening fraction was determined. The graphic representation of the softening fraction vs. interrupt time gave the information of the non-static recrystallization temperature (about 1000℃)and the relationship of precipitation-time-temperature. Static recrystallization kinetics follow Avrami’s law in high deformation temperature, and different values of the exponent n were given to illustrate the different effects of Nb element on static recrystallization at different deformation temperature.

关键词: dynamic recrystallization;static recrystallization;high Nb microalloyed steel;activity energy.

Formability of TRIP/TWIP Steel Containing Manganese of 18.8%

DING Hao , DING Hua , QIU Chunlin , TANG Zhengyou , ZENG Jianmin , YANG Ping

钢铁研究学报(英文版)

The mechanical property and forming limit experiments were carried out on a high manganese TRIP/TWIP steels with 18.8% manganese. And the forming limit diagram was obtained. This high manganese steel shows outstanding mechanical properties combining high strength and good formability. Its FLD0 is about 38%. The effects of conventional mechanical property on the FLD0 were analyzed. With the contents of Mn increasing, FLD0 increases, which indicates TWIP effect is advantageous to enhance formability. Combining with three classical models and volume invariable principle, a FLD model was established, which fits high manganese steels very well.

关键词: high manganese TRIP/TWIP steel;mechanical properties;formability;forming limit diagram

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