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| A RESEARCH ON THE CHANGE OF MECHANICAL PROPERTIES IN THE ROLLING OF HEAVY RAILS |
| CHANG TSO-MEI;GAU TZE-MING;LEI MING-FOO Institute of Mechanical Engineering; Academia Sinica |
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Cite this article:
CHANG TSO-MEI;GAU TZE-MING;LEI MING-FOO Institute of Mechanical Engineering; Academia Sinica. A RESEARCH ON THE CHANGE OF MECHANICAL PROPERTIES IN THE ROLLING OF HEAVY RAILS. Acta Metall Sin, 1959, 4(3): 222-234.
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Abstract The effects of roll pass design on the mechanical properties of rails and the changes inmechanical properties in the processes of rolling and the causes for these changes have beeninvestigated. The height and the angle of the wedge in the trapezoidal passes have also been stu-died. The results show that in the trapezoidal passes a change in the height and the angle of thecutting-in wedge has little effect on the mechanical properties at the foot of the rails; hence itis better to use wedges with a smaller height and a greater angle. It is found that the effect ofinhomogeneous deformation on mechanical properties is also small; hence the question of using2 or 4 trapezoidal passes may be settled by consideration of the mill construction and the condi-tions of production only. The mechanical properties of the bloom undergo considerable changes when it is rolledthrough the successive passes. After the second or the third pass, a lowering in mechanical pro-perties has been recorded; but after the sixth pass the changes in mechanical properties becomesmall. When the rate of cooling is great, the temperature of rolling has little effect on themechanical properties; hence, it is possible under this condition to increase the temperature ofrolling, the amount of reduction and the speed of rolling in order to achieve a reduction in thenumber of passes used.
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Received: 18 March 1959
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[11] 张作梅、徐有容、高子明、郭胜泉,金属学报,第一卷,第二期,1956,165--188页 |
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