性能渐变材料(FGM)是其组成(成分)从一个面到另一个面呈阶梯变化或连续变化，而其性能也随之渐逐变化的非均质复合材料。
The functionally gradient material (FGM) is a non-homogeneous composites which feature a gradual change in properties with the gradient or continuous change of component from one surface to the other.
连续冷却相变实验研究表明，BP模型用于全贝氏体型非调质钢的成分设计是有效的。
The relation between chemical composition of alloyed steel and its hardness under continuous cooling is built by Back Neural Network(BP) method.
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