Large sample plane strain technology based on thermal simulation testing machine

A plane strain compression thermal simulation test was conducted on a large sample of low carbon steel using a thermal simulation test machine, and the stress-strain curves at each pass and phase transition temperatures were analyzed. The microstructure evolution law of the deformation zone of low carbon steel was obtained. By adjusting the parameters of the thermal simulation test machine, the temperature stability of the large sample was ensured during the heating, insulation, and cooling tests. The results show that during the insulation stage, the size of the uniform temperature zone of the sample (length×width×height) was 30 mm × 30 mm × 20 mm, with a temperature difference of about 20 ℃, which met the requirements of the plane strain compression test for the uniform temperature of the sample. After compression deformation, the lateral spread of the sample was relatively small, the microstructure in the middle area of the sample was relatively uniform, and the mechanical properties were relatively stable. The plane strain technology of the thermal simulation testing machine could simulate the plane strain state of low carbon steel compression deformation well, achieving simultaneous analysis of the microstructure and mechanical properties of the material.