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在普通C-Mn-Si系Q&P钢的成分基础上,设计了一种低碳的Q&P钢种,并通过金相显微镜、场发射扫描电镜、X射线衍射仪和拉伸实验等对低碳Q&P钢的组织性能以及配分时间对低碳Q&P钢组织性能的影响进行了研究。结果表明:实验用钢经过Q&P处理后,在配分时间为30 s时得到最佳的力学性能,抗拉强度为1340 MPa,伸长率为20%,强塑积达到最大26800 MPa·%;随配分时间的延长,抗拉强度和伸长率均逐渐降低;残余奥氏体含量在配分时间为30 s时达到最大值9.3%,随配分时间的延长,残余奥氏体量逐渐降低。
Based on the composition of common C-Mn-Si Q & P steel, a low-carbon Q & P steel was designed and characterized by metallographic microscope, field emission scanning electron microscopy, X-ray diffraction and tensile test The effects of steel microstructure and time on the microstructure and properties of low carbon Q & P steel were studied. The results show that the mechanical properties of the experimental steel after Q & P treatment are optimized with the time of 30 s, the tensile strength is 1340 MPa, the elongation is 20%, and the strong plastic product is up to 26800 MPa ·% With the extension of time, the tensile strength and elongation decreased gradually. The retained austenite content reached 9.3% at the maximum of 30 s. With the extension of time, the retained austenite gradually decreased.