结构钢端淬曲线预测新方法

端淬试样硬度分布模型采用了含有待定参数一淬透性系数的解析函数，本文定义的钢的淬透性系数与现有合金元素的淬透性系数不同，其大小直接决定端淬曲线的递减速率．端淬曲线的计算预测问题转化成淬透性系数的求解．在端淬实验标准状态下，淬透性系数取决于钢的化学成分．用分部逼近法建立了结构钢淬透性系数与化学成分之间的关系式．将计算获得的淬透性系数代入到硬度分布模型对端淬曲线进行了预测，结果表明预测曲线与实验值吻合很好．

NEW METHOD FOR PREDICTION OF JOMINY CURVE OF STRUCTURAL STEEL

A novel method for predicting the Jominy curve of structural steels was proposed. An analytical function containing the undetermined parameter was used to calculate the Jominy hardness distributions. This undetermined parameter was defined as the hardenability coefficient of steel, which is different from the conventional hardenability coefficient and depends on the descending rate of the Jominy curve. Therefore, the problem predicting the Jominy curve translated to calculate the hardenability coefficient. It was demonstrated that the hardenability coefficient depends on the chemical composition under the condition of the standard Jominy test. An empirical relationship between the hardenability coefficient and the chemical composition of structural steels has been established using a subsection approach. Substituting the obtained hardenability coefficient into the distribution model of the hardness, the predicted Jominy curves exhibited very good agreements with the experimental data.