Comparison of material flow and deformation resistance of HSLA steel deformed by hot rolling and by flat compression under simulated conditions

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Abstract

To arrive at an optimum rolling mill schedule several thousand experiments may have to be carried out; to accomplish this in industry under actual rolling conditions is not only time consuming but is also costly and measurements are difficult. Several laboratory simulation tests have thus been developed to tackle this problem, one common example of which is the flat compression test.

In an attempt to compare the results of rolling with those of the flat compression test the authors have carried out these tests under similar deformation conditions at different temperatures between 850 and 1100°C using Nb micro-alloyed steel NV4-4. The strain distribution, strain rate ratiation, temperature rise during deformation, deformation, deformation resistance variation and fibre flow have been analysed for both processes, and a comparison criterion has been proposed.

Based on these results, it has been concluded that when the deformation resistance in rolling and that in flat compression are comparable, the two processes can be considered to be comparable. When this condition is satisfied all the mechanical properties and the microstructure are also comparable. It has also been concluded that the flat compression test can be used as a powerful laboratory test for simulating the rolling process in order to evaluate the optimum rolling schedule.

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Present address: Central Metal Forming Institute, HMT Limited, Hyderabad-500 854, India.

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