低碳硅锰钢的Q&P热处理工艺
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摘要
研究了Q&P工艺对添加硅和锰的低碳钢组织性能的影响。通过X射线衍射仪、电子背散射衍射技术、拉伸试验等对不同Q&P工艺参数条件下试验钢的组织和性能进行了测试分析。结果表明,经过Q&P工艺热处理后,试验钢中形成了一定比例的纳米级的残留奥氏体。随着配分温度的升高,试验钢中残留奥氏体含量升高,抗拉强度降低,伸长率增加。配分温度为450℃时,随着配分时间的增加,试验钢中残留奥氏体含量先增加后降低,在配分时间为20 s时达到最大值,但抗拉强度降低,伸长率呈增加趋势。强塑积在450℃配分20 s时最大,与残留奥氏体含量变化一致。
The effect of Q&P process on the microstructure and mechanical properties of a low carbon Si-Mn steel was studied by X-ray diffraction,electron backscatter diffraction,and tensile tests. The results show that a certain proportion of nanoscale retained austenite is found in the Q&P treated experimental steel. The amount of retained austenite increases with the partitioning temperature. The tensile strength decreases and the elongation increases as the partitioning temperature increases. When the partitioning temperature is 450 ℃,the amount of retained austenite firstly increases and then decreases as the partitioning time further increases,reaches the maximum at 20 s. The tensile strength decreases and the elongation increases with the partitioning time. The maximum strength-ductility balance is obtained at 450 ℃partitioning for 20 s,which in accordance with the amount of retained austenite.
The effect of Q&P process on the microstructure and mechanical properties of a low carbon Si-Mn steel was studied by X-ray diffraction,electron backscatter diffraction,and tensile tests. The results show that a certain proportion of nanoscale retained austenite is found in the Q&P treated experimental steel. The amount of retained austenite increases with the partitioning temperature. The tensile strength decreases and the elongation increases as the partitioning temperature increases. When the partitioning temperature is 450 ℃,the amount of retained austenite firstly increases and then decreases as the partitioning time further increases,reaches the maximum at 20 s. The tensile strength decreases and the elongation increases with the partitioning time. The maximum strength-ductility balance is obtained at 450 ℃partitioning for 20 s,which in accordance with the amount of retained austenite.
引文
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[2]Huang Xuefei,Liu Wenli,Huang Yuyin,et al. Effect of a quenchinglong partitioning treatment on the microstructure and mechanical properties of a 0. 2C%bainitic steel[J]. Journal of Materials Processing Technology,2015,222:181-187.
[3]周澍,钟勇,王利. 1000 MPa级高延伸率Q&P钢的实验室研究[J].宝钢技术,2015(4):51-61.Zhou Shu,Zhong Yong,Wang Li. Development of 1000 MPa grade quenched and partitioned steels with high elongation[J]. Baosteel Technology,2015(4):51-61.
[4]李万松,李忠义,田文怀.淬火温度对低碳Q&P钢组织和性能的影响[J].金属热处理,2016,41(4):17-21.Li Wansong, Li Zhongyi, Tian Wenhuai. Effect of quenching temperature on microstructure and properties of low-carbon Q&P steel[J]. Heat Treatment of Metals,2016,41(4):17-21.
[5]钟宁.高强度Q&P钢和Q-P-T钢的研究[D].上海:上海交通大学,2009.
[6]Hua Jun,Du Linxiu,Xu Wei,et al. Ensuring combination of strength,ductility and toughness in medium manganese steel through optimization of nano-scale metastable austenite[J]. Materials Characterization,2018,136:20-28.
[7]陈连生,张健杨,田亚强,等. Mn配分行为对低碳高强Q&P钢组织与性能的影响[J].金属热处理,2015,40(9):130-134.Chen Liansheng,Zhang Jianyang,Tian Yaqiang,et al. Effects of Mn partitioning on microstructure and mechanical properties of low-carbon Q&P steel[J]. Heat Treatment of Metals,2015,40(9):130-134.
[8]Somania M C,Porter D A,Karjalainen L P,et al. Process design for tough ductile martensitic steels through direct quenching and partitioning[J]. Materials Today:Proceedings,2015,2:631-634.
[9]Chen Liansheng, Hu Baojia, Xu Jinghui, et al. Cu partitioning behavior and its effect on microstructure and mechanical properties of0. 12C-1. 33Mn-0. 55Cu Q&P steel[J]. Journal of Wuhan University of Technology,2017,32(5):1179-1185.
[10]Matlock D K,Brautigam V E,Speer J G. Application of the quenching and partitioning(Q&P)process to a medium-carbon high Si microalloyed bar steel[J]. Materials Science Forum,2003,426-432:1089-1094.