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对冷轧C-Si-Mn系高强钢进行了淬火与配分(Q&P)处理。利用扫描电镜、电子背散射衍射、X射线衍射等实验手段,研究了Q&P工艺参数与残留奥氏体量的关系。结果表明,残留奥氏体量在峰值淬火温度周围较大范围内变化不大,均在15%以上。配分温度的升高和配分时间的增加有助于残留奥氏体量的提高,过高的配分参数则会导致残留奥氏体的分解与碳化物的析出。实验钢于760℃淬火至160℃后经450℃配分60 s,残留奥氏体量可以达到22%,保证了较高的强塑积23 GPa·%,其中抗拉强度1518 MPa,伸长率15.2%。
The cold-rolled C-Si-Mn high-strength steel was quenched and allocated (Q & P) treatment. The relationship between the technological parameters of Q & P and the amount of retained austenite was studied by using scanning electron microscopy, electron backscatter diffraction and X-ray diffraction. The results show that the amount of retained austenite does not change much in the larger range around the peak quenching temperature, all above 15%. Partitioning temperature and dosing time help to increase the amount of retained austenite, excessive parameters will lead to the distribution of residual austenite and carbide precipitation. Experimental steel quenched at 760 ℃ to 160 ℃ after 450 ℃ with 60 s, the amount of retained austenite can reach 22%, ensuring a high strength plastic product 23 GPa ·%, including tensile strength 1518 MPa, elongation 15.2%.