| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which the phase transformation of low alloy steel, particularly, steel containing Cr, Mo, and B can be predicted. SOLUTION: In a method by which the structure of steel which may cause a single structure or composite structure, such as the massive ferrite, low bainite, etc., due to phase transformation fromγand contains one or more of Cr, Mo, and B can be predicted, the phase transformation of the steel is predicted by calculating the nucleation speed and growing speed by multiplying the nucleation speed formula and growing speed formula of each transformed product adopting the influences of the alloy elements on the C concentration at theγ/αinterface, etc., by a transforming speed suppressing index FN. The steel to which this method is applied contains one or more of 0.03-5% Cr, 0.03-2% Mo, and 0.0003-0.005% B.
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