temperature gradient method meaning in English

温度梯度法

The key to prediction of casting shrinkage / porosity lies in ascertaining the critical value of temperature gradient and niyama criterion . the thesis put forward two methods to ascertain the value , one is which is positive - direction and the other is negative - direction . we verify the realistic arithmetic of temperature gradient method and niyama criterion method by experiment , and we can draw a conclusion that the arithmetic is correct and reasonable in most cases and choice of developing tool is sound
临界梯度值和新山判据临界值的确定是实现缩孔缩松预测的关键，本文提出了确定临界值的正向法和反向法，并以高铬铸铁件缩孔缩松预测和铸造工艺改进为研究对象，应用正向法，确定了温度梯度法的临界值为180 m 。