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Correlation between Microstructures and Yield Strength of a High Strength enameling steel

Journal of Materials Science & Technology 2012年第8期28卷 737-744页

作者： Ming Jiang Xuefeng Yang Shiyan Pan Bruce W.Krakauer Mingfang Zhu Jiangsu Key Laboratory for Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China AO Smith Corporate Technology Center MilwaukeeWI53224USA

Numerical estimates of the components of yield strength of a high strength Fe-C-Mn-P-N-Si enameling steel were determined using empirical relationships between microstructure and yield strength. Results are reported for both the hot rolled （HR） and cold rolled （CR） forms before and after simulating an enamel-fire anneal （EFA）. To determine the solubilities of alloying elements, thermodynamic calculations were performed in combination with the considerations of process conditions and the element diffusivities. The results show that the main solid solution strengtheners were the elements Mn, Si, and P, while the elements C and N were nearly completely tied up as precipitates. The yield strength reduction, due to the EFA, resulted primarily from an increase in grain size and a decrease in dislocation density, and the EFA appeared to have a negligible effect on the element solubilities.

关键词： enameling steel Enamel-fire anneal Microstructure Yield strength Thermodynamic calculation

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Study on microstructure and properties of cold-rolled high strength steel for enameling

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Baosteel Technical Research 2017年第2期11卷 37-41页

作者： WEI Jiao SUN Quanshe Research Institute Baoshan Iron & Steel Co.Ltd.

With its superior comprehensive properties, cold-rolled enameling steel is widely applied in many fields. However, its low yield stress greatly limits its application. This study aims to improve the yield stress of cold-rolled enameling steel under the premise of meeting formability and enameling properties by strengthening the ferrite matrix via solid strengthening of Mn. The grain size of ferrite before and after enameling,mechanical properties of annealed steel, and precipitation behavior of second-phase precipitates are obtained through studying the microstructure and properties of enameling steel at different stages. The microstructure of the steel investigated at room temperature is found to contain equiaxial ferrite and bunchy cementite particles;the ferrite grains have grown to some extent after enameling. The fine dispersed TiC particles and cementite particles contained in the annealed steel are the main factors improving the hydrogen storage capability. Finally, the result of a falling-ball impact test shows that the steel has achieved excellent adherence.

关键词： enameling steel cold rolling high strength hydrogen storage capability

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