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采用光学显微镜、场发扫描电镜和X射线衍射仪研究了配分温度对低碳高强Q&P钢的组织演变规律,并分析了配分温度对其力学性能和残留奥氏体含量的影响。结果表明:实验用钢0.20C-1.28Mn-0.37Si经过Q&P处理后,随着配分温度的升高,其抗拉强度逐渐降低,伸长率先升高后降低,在配分温度400℃时,强塑积达到最大22610 MPa·%;随配分温度的升高,析出的碳化物开始聚集长大,并消耗了马氏体中扩散的碳,使残留奥氏体的含量降低,残留奥氏体含量在400℃时达到最大的体积分数5.3%,试样拉伸断口形貌具有典型的韧窝状特征。
The microstructure evolution of low-carbon high-strength Q & P steel was studied by optical microscope, field emission scanning electron microscopy and X-ray diffraction. The effects of temperature on the mechanical properties and retained austenite content were also analyzed. The results show that the tensile strength of 0.20C-1.28Mn-0.37Si steel decreases gradually with the increase of the partitioning temperature after the Q & P treatment. The elongation increases first and then decreases. When the temperature is 400 ℃ The plastic product reached the maximum of 22610 MPa ·%. With the increase of the component temperature, the precipitated carbides began to aggregate and grew, and the carbon diffused in the martensite was consumed, the content of retained austenite decreased and the content of retained austenite The maximum volume fraction reaches 5.3% at 400 ℃. The tensile fracture appearance of the sample has typical dimple-like features.