| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.9 ( March 1984 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Controlling of Microstructure and Mechanical Properties Utilizing Deformation Resistance in Plate Rolling
Yoshiyuki Saito, Motomu Kimura, Michihiro Tanaka, Toshihiro Sekine, Kazuya Tsubota, Tomoo Tanaka |
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Synopsis : Production scale rolling experiments were conducted in order to formulate the effect of rolling conditions on microstructure during rolling. On the basis of the experimental results the relation between microstructure and deformation resistance was obtained. The results are summarized as follows: (1) Grain size variation of austenite and kinetics of Nb (C,N) precipitation can be expressed by simple mathematical equations. These two factors are closely related to deformation resistance. (2) Strain accumulation in the low temperature austenite region and the austenite-to-ferrite transformation kinetics are estimated by deformation resistance. (3) Both ferrite grain refinement and ferrite strengthening parameters are closely related to tensile and impact properties of steels. The former parameter is determined by recrystallized austenite grain size and strain accumulated prior to transformation, and the latter by the sum of the product of fractional transformation and strain given at each rolling pass. The proper control of these two parameters makes the control of mechanical properties practicable. |
| TextiPDF: 10p./455kbj |