Continuous casting billet intermediate crack initiation critical strain measuring method
A technology of critical strain and continuous casting slabs, applied in the direction of applying stable tension/pressure to test material strength, etc., can solve the problems of no quantitative research, no quantitative research of ZDT temperature critical value, etc., and achieve accurate results
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Embodiment 1
[0039] In this embodiment, the steel used is bearing steel.
[0040] A method for measuring the critical strain of crack initiation in the middle of a continuous casting slab, comprising the following steps:
[0041] (1) Sampling
[0042] The sampling position of the tensile specimen in the middle crack initiation experiment is as follows: figure 1 As shown, the obtained continuous casting slab samples were prepared for tensile tests;
[0043] (2) Tensile test
[0044] Develop an experimental protocol, using figure 2 The heating system of the intermediate crack initiation experiment shown is heating from room temperature to 1200°C at a heating rate of 10°C / s; holding at 1200°C for 20s to uniform the composition and temperature; then heating to the stretching temperature at a heating rate of 10°C / s Below 10°C; then heat up to stretching temperature at 0.5°C / s, hold for 10s at 6×10 -3 the s -1 Tensile test was carried out at the strain rate to obtain the stress-strain cur...
Embodiment 2
[0054] A method for measuring the critical strain of crack initiation in the middle of continuous casting slab, same as embodiment 1, the difference is:
[0055] (1) After determining the experimental temperature and critical strain of crack initiation, at a temperature lower than the actual ZDT-LIT temperature range (1310°C), take a sample of the continuous casting slab, and use a temperature rise of 10°C / s from room temperature Heating rate to 1200°C; holding at 1200°C for 20s to uniform composition and temperature; then heating to 1300°C at a heating rate of 10°C / s; then heating to 1310°C at 0.5°C / s, holding for 10s at 6×10 -3 the s -1 Tensile experiments were carried out at different strain rates, and different stretching times were carried out to obtain tensile experiments with different strains. The strains were: (a) ε = 0.02, (b) ε = 0.03, (c) ε = 0.04, (d)ε=0.05, (e)ε=0.06; do 5 groups of experiments in parallel;
[0056] (2) For the tensile samples corresponding to ...
Embodiment 3
[0058] A method for measuring the critical strain of crack initiation in the middle of continuous casting slab, same as embodiment 1, the difference is:
[0059] (1) Different types of continuous casting slabs are selected, which are microalloyed steel continuous casting slabs;
[0060] (2) In step 2, the microalloy steel continuous casting slab is heated from room temperature to 1300 °C at a heating rate of 10 °C / s; at 1300 °C for 20 seconds to uniform composition and temperature; and then at a heating rate of 10 °C / s The heating rate is heated to 10°C below the stretching temperature; then heated to the stretching temperature at 0.5°C / s, and kept for 10s at 6×10 -3 the s -1 Tensile tests were performed at the strain rate.
[0061] (3) In step 3, the experimental temperature of crack initiation determined in this embodiment is 1430° C.;
[0062] (4) In step 3, according to the stress-strain curve of the tensile specimen corresponding to the determined experimental temperat...
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