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Optimization of RPC technique for refining the intermediate transformation microstructure

Journal of University of Science and Technology Beijing 2002年第3期9卷 193-196页

作者： xueminwang ChengjiaShang 等 MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijin

The influence of processing parameters ofrelaxation-precipitation-controlling phase transformation (RPC) technique, finish rollingtemperature, reduction ratio and relaxing time on the microstructure was studied bythermo-simulation for a low carbon Nb and Ti containing micro-alloyed steel. The microstructure wasinvestigated by optical microscope, transmission electron microscope and electron back scatterdiffraction (EBSD). The statistical results of the packet size were calculated. It shows that, afterRPC process, the steel is a composite microstructure of bainite and matensite. The bestthermo-simulation process for refinement in this experiment is deformation for 30 percent at 850 degC, and then relaxing at this temperature for 60 s to 200 s. Increasing the reduction ratio from 30percent to 60 or decreasing the deformation temperature to 800 deg C would cause the best relaxationtime to become shorter, increasing the deformation temperature to 900 deg C would cause therefinement effect to be weak.

关键词： RPC technique microstructure refinement deformation temperature reduction

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Over-relaxation effect of deformed austenite on ageing behavior of an Nb-bearing microalloyed steel

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Journal of University of Science and Technology Beijing 2005年第3期12卷 248-251页

作者： ShaoqiangYuan ShanwuYang xueminwang XinlaiHe DepartmentofMaterialsPhysics UniversityofScienceandTechnologyBeijingBeijing100083China TangshanCollege Tangshan063000China／／DepartmentofMaterialsPhysicsUniversityofScienceandTechnologyBeijingBeijing100083China

The ageing behavior of an Nb-bearing microalloyed steel at 525℃ was investigated by thermo-simulation test, hardness measurements and transmission electron microscopy (TEM). Prior to ageing, the steel was deformed in austenite zone followed by a long relaxation. Experimental results indicate that the hardness decreases gradually in the initial stage until ageing for 120 min, and then increases continuously until 1200 min. The coarsened precipitates (>10 nm) formed in deformed austenite remain nearly unchanged in size, even after ageing for long time, while the further precipitates, which nucleate in a phase, contribute to the increasing of hardness. By comparison, the undeformed samples in austenite subjected to the same ageing process display a very similar hardness change trend to that of over-relaxation ones and have higher hardness values at each corresponding period.

关键词： over-relaxation ageing hardness precipitates

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Behavior of precipitation in bainitic steel during relaxation processing of RPC technique

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Journal of University of Science and Technology Beijing 2004年第3期11卷 230-234页

作者： ShanwuYang ShaoqiangYuan： xueminwang HuibinWu XinlaiHe MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China TangshanCollege Tangshan063000China

Thermal simulation test, TEM (Transmission Electron Microscope) and nanobeamEDS (Energy Dispersed x-ray Spectrum) techniques were used to investigate the precipitation behaviorof Nb, Ti, Mo etc. in HSLA (High Strength Low Alloy) steel. The strain induced precipitationoccurred during the isothermal relaxation stage after deformed in the non-recrystallizationtemperature region. After 30% predeformation at 850 and 900℃, there are two kinds of particles,(Ti,Nb)(C,N) and a few Nb(C,N), to precipitate during holding. The content of Nb in particles riseswith the relaxation time increasing. During the final holding stage, some Nb and Ti atoms in thelattice sites of the precipitates would be replaced by Mo atoms, and the Mo content in theprecipitates increases with the relaxation time. The results were compared with the refinementeffect of microstructures caused by relaxation-precipitation controlling transformation (RPC)processing.

关键词： RPC technique microalloyed element (Ti,Nb)(C,N) nanobeam EDS

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