Abstract：In order to research the impact of temperatures of steel bar on the cooling bed on the performance of deformed steel bars and the law of structure evolution,the tensile test and metallographic structure analysis of deformed steel bars with different temperatures of steel bar on the cooling bed were carried out by means of a tensile test machine and a scanning electron microscope,with reason of phase change explained by phase change theory. The impact of the temperature of steel bar on the cooling bed on the performance of deformed steel bars was discussed and explored. The results show that the occurrence of phase change is under the condition that the reduction in the chemical driving force of the system must overcome the increase in the elastic energy of the system and the increase in surface energy caused by the formation of a new phase. Besides,the deformation will increase the deformation storage energy ΔGD. As a result,the phase change driving force is increased,causing a rise of the phase change temperature. When the temperature on cooling tables decreases(not lower than the critical phase change temperature), ferrite and pearlite are formed on the surface and center,the yield strength increases from 435 to 440 MPa, and the surface Vickers hardness increases from 207 to 257. As the temperature on the cooling table becomes lower,more and more tempered sorbite is formed on its surface. The tensile strength increases and decreases irregularly. And the grain size/level increases from 10.5 to 13.5 as the temperature on the cooling table decreases.
蔡伟, 金梁, 毛俊春, 刘昌武, 姚赛峰, 谭忠. 不同上冷床温度对螺纹钢组织性能的影响[J]. 钢铁, 2020, 55(12): 92-98.
CAI Wei, JIN Liang, MAO Jun-chun, LIU Chang-wu, YAO Sai-feng, TAN Zhong. Impact of different temperatures of deformed steel bar on cooling bed on performance of microstructure[J]. Iron and Steel, 2020, 55(12): 92-98.
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2020, Vol. 55 
