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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。
The effects of isothermal temperature on the formation of intragranular ferrite were investigated in the medium carbon vanadium microalloyed steel at 900, 600, 550 and 500 ℃ after being aged at 900 ℃. The microstructure of the microstructure was observed. . The results show that the ferrite content of the original sample changes significantly from 5.26% to 37.94% after heat treatment at 900 ℃. The isothermal treatment decreases the ferrite crystal morphology with isothermal temperature from The transition from massive ferrite to short-rod ferrite, and the short-rod to acicular ferrite changed with the further decrease of temperature. At the same time, the ferrite content of the test steel increased with decreasing temperature, and the grain size decreased gradually small.