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A new physical simulation method for evaluating the effect of shear deformation on the evolution of a microstructure is proposed. This method utilizes a high-speed compression testing machine and is capable of simulating the formation of fine grained steels in the transformation route. The outline of the proposed method, which is based on shearing and named the ‘interrupt shearing test’, is presented. The result of the preliminary application of the newly proposed test at an elevated temperature is shown. It becomes clear that the large shear deformation reproduced by the proposed method is capable of producing fine grained steels with a grain size of around 2 μm surrounded by high angle grain boundaries (HAGBs), although controlled cooling immediately after plastic deformation to accelerate transformation into finer grains is not applied in the present test. [doi:10.2320/matertrans.MD201119]

Interrupt Shearing Test for Evaluating Effect of Large Shear Deformation on Evolution of Microstructure into Ultrafine Grains