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用Gleeble-3500型热模拟试验机研究了加热速度和保温时间对X70钢组织和性能的影响。结果表明,加热速度对奥氏体相变点及冷却后的组织和性能有显著影响。随加热速度的增加,相变点呈线性增加,而钢的强度和韧性降低。随着保温时间的延长,钢的强度在保温时间为60 s时达到最大值,随保温时间的进一步增加,强度呈降低的趋势;而且随加热温度的升高,降低的趋势更明显。而冲击韧性则随保温时间的延长呈降低趋势。
The effect of heating rate and holding time on microstructure and properties of X70 steel was studied by Gleeble-3500 thermal simulation testing machine. The results show that the heating rate has a significant effect on the austenite transformation temperature and the microstructure and properties after cooling. As the heating rate increases, the transformation point increases linearly, while the strength and toughness of the steel decrease. With the extension of holding time, the strength of steel reaches the maximum value when the holding time is 60 s. With the further increase of holding time, the strength of steel decreases, and the decreasing trend becomes more obvious with the increase of heating temperature. The impact toughness decreases with the extension of holding time.