用修正淬透性系数法对反应堆压力容器锻件RTNDT数值的预估

分析反应堆压力容器（RPV）锻件制造过程中关键化学元素含量及基准无塑性转变温度（RTNDT）数值，通过引入修正淬透性系数，建立了反映RTNDT变化规律的修正淬透性系数函数表达式，并给出了实例验证，结果表明，通过本文建立的修正淬透性系数函数式可以比较精确地预估RPV锻件的RTNDT值。 

Estimation of RTNDT in Reactor Pressure Vessel Forgings with Modified Hardenability Coefficient Method

The content of critical chemical elements and the value of reference nil-ductility transition temperature(RTNDT) in the manufacturing process of reactor pressure vessel(RPV) forgings were analyzed. By introducing the modified hardenability coefficient into the hardenability coefficient function, the modified function which reflected the variation rule of RTNDT was established, and an example was also given to verify the effectiveness of the modified hardenability coefficient function. This study demonstrates that by using the modified hardenability coefficient function, the RTNDT value of forgings can be predicted relatively accurately.