polynomial-like function

The transformation diagrams of super-cooled austenite are described by polynomial-like function and cubic spline function. The database of diagrams is set up on computer, which provides abundant preparations for the following work.

用拟和法及三次样条函数描述了钢的过冷奥氏体冷却转变曲线，在微机上建立了曲线数据库，为后续工作做了充分的准备工作。

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