Effect of Cooling Rate and Deformation on Microstructures and Critical Phase-Transformation Temperature of Boron-Nickel Added HSLA H-Beams

钢铁研究学报(英文版), 2012, 19(2): 62-66.

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1.Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education, ShandongUniversity, Jinan 250061, Shandong, China

2.Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education, ShandongUniversity, Jinan 250061, Shandong, China

3.Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education, ShandongUniversity, Jinan 250061, Shandong, China

4.Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education, ShandongUniversity, Jinan 250061, Shandong, China

5.Laiwu Iron and Steel Company Ltd, Laiwu 271104, Shandong, China）

6.Laiwu Iron and Steel Company Ltd, Laiwu 271104, Shandong, China）

关键词：高强度低合金钢 , 相转变温度 , 冷却速度 , 塑性变形 , 显微组织 , H型钢 , 连续冷却转变 , 贝氏体相变

Effect of Cooling Rate and Deformation on Microstructures and Critical Phase-Transformation Temperature of Boron-Nickel Added HSLA H-Beams

Keywords： thermomechanical simulation , HSLA H-beam , microstructure , CCT diagram ,

Microstructures and critical phase-transformation temperature of boron-nickel added Nb-treated high strength low alloy （HSLA） H-beams cooled at different cooling rate, with different deformation were investigated. Continuous cooling transformation （CCT） diagram of this new type of steel was obtained by using Gleeble 1500 ther- momechanical simulator. Microstructures and hardness, especially micro-hardness of the experimental steel were in- vestigated by optical microscopy （OM）, scanning electron microscope （SEM）, Rockwell and Vickers hardness tests. Phase analysis was also studied by X~ray diffraction （XRD）. The results indicated that with increase of cooling rate, microstructures of continuous cooled specimens gradually transformed from polygonal ferrite and pearlite, grain boundary ferrite and bainite, bainite and martensite to single martensite. The CCT diagram revealed that slow cool- ing was needed to avoid austenite-bainite transformation to ensure toughness of this steel. By plastic deformation of 40%, austenite-ferrite transformation temperature increased by 46℃, due to deformation induced ferrite transfor- mation during continuous cooling, but Rockwell hardness has little change.

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材料期刊网

Effect of Cooling Rate and Deformation on Microstructures and Critical Phase-Transformation Temperature of Boron-Nickel Added HSLA H-Beams

参考文献