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实测了空冷条件下金属的温度,分析了相变潜热释放引起的温降速度变化规律,并通过冷却速度曲线畸变特征点对实际工况下的金属相变开始温度和结束温度以及相变持续时间进行了判定。结果表明:该判定方法能够准确判断非恒速缓慢冷却时金属的相变特征点,解决了热模拟CCT曲线在实际应用中的局限性,是一种适合于实际生产应用的相变特征点的数值判定方法。
The temperature of metal under air cooling condition was measured and the variation law of the temperature drop caused by the release of latent heat of phase transformation was analyzed. According to the feature point of the cooling rate curve, the change of metal transition start temperature and end temperature and the phase transition duration Made a decision. The results show that this method can accurately determine the phase transition point of metal during non-constant slow cooling and solve the limitation of thermal simulation CCT curve in practice. It is a suitable phase transition point for practical production and application Numerical determination method.