High temperature mechanical properties of Q345 continuous casting slab under compression
LI Li1,2, DU Yi-zhe1,2, WANG Qin-zheng1,2, CHEN Deng-fu1,2
1. College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China; 2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400030, China
Abstract：Q345 steel is widely used, and its mechanical properties at high temperature under tensile condition have been studied. However, data on mechanical properties of high temperature compression are scarce. Thermal compression tests of Q345 continuous casting slab have been conducted with Gleeble-3500 thermal simulator. The variation of yield strength, compressive strength and elastic modulus with temperature (973~1 673 K) under compression with strain rate of 0.01 s-1 was studied, and the mechanical properties of the sample at 1 473 K with the strain rate (0.001, 0.01 and 0.05 s-1) were also discussed. The results show that both yield strength and compressive strength are sensitive to temperature in the range of 973-1 373 K.The yield strength decreased from 90 to 24 MPa, and the compressive strength decreased from 202 to 40 MPa.At the range of 1 373-1 673 K, the decrease of yield strength and compressive strength is smooth.The elastic modulus decreases with the increase of temperature, its value differs the most(1 712 MPa) at 1 473 and 1 573 K.With the increase of strain rate, the yield strength did not change significantly, all around 20 MPa, while the ultimate compressive strength increased from 28 to 45 MPa.Based on the experimental data, the relationship curve of high-temperature performance parameters, such as yield strength, and temperature variation of Q345 steel continuous casting billet under thermal compression was drawn, providing reference data for such technologies as soft or heavy reduction process.
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2021, Vol. 31 
