Influence of Isothermal Temperature on Formation of Intragranular Ferrite in Vanadium-microalloyed Steels
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摘要: 以中碳含钒微合金钢为对象,经过900℃时效处理后在680、600、550、500℃下进行等温处理时,研究等温温度对晶内铁素体形成的影响,观察其金相组织。结果表明:经过900℃保温处理后,原始试样的铁素体的含量发生了显著的变化,从5.26%增加到了37.94%;等温处理后,随等温温度的降低铁素体的晶体学形态由块状铁素体向短棒状铁素体过渡,随着温度的进一步降低,短棒状向针状铁素体变化;同时随温度的降低试验钢的铁素体含量逐渐增加,晶粒尺寸逐渐减小。Abstract: Microalloying of steels refers to adding a small amount of microalloying elements into steels,which can significantly enhance the mechanical properties of steels. In this paper,the research object is medium-carbon microalloyed steel containing vanadium. After aging treatment at 900℃,and isothermal treatment at 680,600,550 and 500℃ respectively,the influence of isothermal temperature on the formation of intragranular ferrite is studied,and the microstructures are observed. The results show that after heat preservation at 900℃,there is a significant increase of ferrite content in the original sample from 5.26% to 37.94%. After isothermal treatment,with the decrease of isothermal temperature,the crystallographic form of ferrite transforms from lumps to short rod-like shape. As the temperature further reduces,it transforms from short rod-like ferrite to acicular ferrite; with the decrease of temperature,ferrite content in the tested steel gradually increases while the grain size gradually decreases.
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