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利用MMS-200热模拟实验机对X90级别管线钢进行了双道次热压缩实验,研究了变形温度和道次间隔时间对X90管线钢静态再结晶行为的影响。根据实验结果计算得到了X90的静态再结晶的激活能,建立了静态再结晶动力学模型。结果表明:X90管线钢静态再结晶行为受道次间隔时间、变形温度的影响较大,随着变形温度的升高和道次间隔时间的增加,实验钢的静态再结晶体积分数增加;但其中变形温度的影响更为显著。变形温度低于950℃时,实验钢不会发生静态再结晶,而当温度高于1000℃时,可实现完全静态再结晶。
Two-pass thermal compression test was carried out on X90 grade pipeline steel with MMS-200 thermal simulation machine. The effect of deformation temperature and interval time on the static recrystallization of X90 pipeline steel was studied. According to the experimental results, the activation energy of X90 static recrystallization was calculated and the static recrystallization kinetics model was established. The results show that the static recrystallization behavior of X90 pipeline steel is greatly affected by the interpass time and deformation temperature. The static recrystallization volume fraction of experimental steel increases with the increase of deformation temperature and interpass time. The effect of deformation temperature is more pronounced. When the deformation temperature is lower than 950 ℃, the static recrystallization does not occur in the experimental steel, and when the temperature is higher than 1000 ℃, completely static recrystallization can be achieved.