Abstract: The third generation of high-strength Q&P (quenching and partitioning) steel,as a new type of heat-treated steel, has high strength and high elongation owning to its martensite and retained austenite microstructure. In this paper, the microstructure and properties of Q&P steel were studied by using Gleeble thermal simulation tester to change the heating rate (5 ℃/s, 50 ℃/s, 300 ℃/s) and partitioning time (10 s, 60 s). The morphology, size, and phase of the Fe-0.23C-1.55Si-1.92Mn-0.04Al steel were studied by scanning electron microscope (SEM), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD). The tensile test was performed by a Gleeble thermal simulation tester. The results show that, increasing the heating rate helps refine the austenite grains, and the size of the secondary martensite after secondary quen-ching to room temperature also decreases. When the partition time is 10 s and 60 s, the heating rate is beneficial to increase the content of retained austenite. When the heating rate is 300 ℃/s and the partition time is 60 s, the product of strength and elongation of the sample can reach 37.9 GPa·%.
左智成, 苏钰, 李军. 加热速率和配分时间对低碳Q&P钢组织及性能的影响[J]. 材料导报, 2021, 35(12): 12156-12160.
ZUO Zhicheng, SU Yu, LI Jun. Effect of Heating Rate and Partitioning Time on Microstructure and Properties of Low Carbon Q&P Steel. Materials Reports, 2021, 35(12): 12156-12160.
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2021, Vol. 35 
