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Effect of 400 ℃ annealing on strength and dislocation strengthening of Q235 steel processed by equal-channel angular pressing |
School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Q235 steel was quenched and subjected to equal-channel angular pressing(ECAP) processing. The effect of 400 ℃ annealing on strength and dislocation strengthening of the ECAP processed Q235 steel was investigated by tensile testing, X-ray diffractometer analysis and Taylor equation of strength-dislocation density relationship. Tensile testing indicates that the yield strength of the ECAPed Q235 steel is decreased from 825 MPa to 725 Mpa by 400 ℃ annealing, while the strain hardening capacity and ductility are obviously improved. The theoretical calculation based on X-ray diffractometer analysis and Taylor equation indicates that 400 ℃ annealing has slight influence on the dislocation strengthening. The decreasing of strength is not due to the dislocation strengthening decrease, but may due to grain boundary or subgrain boundary strengthening.
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