为验证Maynier和Carsic硬度预测模型的实用性,针对宝钢开发的两种钢材设计了简单的末端淬火试验来确定冷却速率与硬度的关系,并与Carsic硬度预测模型的计算值进行了比较.结果表明:该硬度预测模型可以较为准确地预测一种钢的硬度值,但另一种钢的计算值和实测值偏差较大.由此可见该硬度预测模型不具有普适性,实际使用中需要通过试验验证和进行修正.

Hardness-prediction mathematic models that calculate the hardness from chemical composition of steel and heat treatment conditions such as heating temperature and time as well as cooling rate were put forward by Maynier,modified and put into practice by Carsic.To verify the validity of the models,the Jominy bar tests were designed to quantitatively determine the relationship between the cooling rate and the hardness of two steels with different chemical compositions developed in Baosteel,and the comparison was made between the measured harnesses and the calculated ones by the models from the measured cooling rates.The results show that the models are good enough to predict the hardness of one steel,but not so good for another.It is,therefore,concluded that the validation and modification are necessary before the hardness-prediction models are used.