Abstract
In this paper, the microstructure and properties of a laboratory low-carbon bainitic high-strength steel were analyzed. On the Gleeble-3500 thermal simulator, the effects of different deformation temperature and deformation rate on the deformation resistance of the test steel were studied. The experimental results show that the test steel has a yield strength of 625MPa, a tensile strength of 740MPa, an elongation of 20%, a yield ratio of 0.84 and an average effective grain size of 4.5μm. It can meet the requirements of most engineering machinery steel. The microstructure of the test steel is lath bainite containing large density dislocations. The precipitated particles are dispersed and the sizes are different. It can be found that the carbon and nitrogen composites of Nb and Ti are precipitated by energy spectrum analysis. Through the thermal simulation test, the deformation resistance model of the test steel was developed.
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