Microstructure and mechanical properties of a medium-carbon bainitic steel by a novel quenching and dynamic partitioning (Q-DP) process
Microstructure and mechanical properties of a medium-carbon bainitic steel by a novel quenching and dynamic partitioning (Q-DP) process
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DOI：
10.1016/j.msea.2016.03.042
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发表时间：
2016-04
期刊：
影响因子：
6.4
通讯作者：
Qiangguo Li;Xuefei Huang;Weigang Huang
中科院分区：
文献类型：
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作者：
Qiangguo Li;Xuefei Huang;Weigang Huang
研究了0.3C-1.4Si-1.8Mn-1.3Cr-0.3Mo(wt%)贝氏体钢的淬火动态分配(Q-DP)新工艺，并对其组织和性能进行了研究。结果表明，Q-DP处理后的钢组织由贝氏体+马氏体+残余奥氏体组成，具有较好的抗拉强度(1500℃以上)、总延伸率(17%以上)和冲击韧性(90℃以上)的综合性能。在不同的Q-DP工艺中，250℃Q-DP工艺处理的样品表现出最佳的强度(1519℃)、塑性(21.3%)、强度和伸长率的乘积(PSE，32.4 GPA%)和最大冲击韧性(108℃)的组合。此外，还研究了Q&P和Q-DP样品的加工硬化行为。应力-应变曲线表明，Q&P和250℃Q-DP处理的样品具有较大的均匀延伸率，计算得到的n值分别为0.109和0.101。
A novel Quenching and Dynamic Partitioning (Q-DP) process for a 0.3C-1.4Si-1.8Mn-1.3Cr-0.3Mo (wt%) bainitic steel was developed and the microstructure and mechanical properties were investigated. The results show that the microstructure of the Q-DP treated steel consists of bainite, martensite and retained austenite, and it exhibit a better combination of tensile strength (above 1500 MPa), total elongation (above 17%) and impact toughness (above 90 J). Among the different Q-DP process, the sample treated by 250 °C Q-DP process exhibits the best combination of strength (1519 MPa), ductility (21.3%), the product of strength and elongation (PSE, 32.4 GPa%) and maximum impact toughness (108 J) compared to the quenching and partitioning (Q&P) process and other Q-DP processes. In addition, the work hardening behaviors of the Q&P and Q-DP samples were investigated. The stress-strain curves show that the Q&P and 250 °C Q-DP treated samples exhibit the larger uniform elongation and the value of n calculated for samples is 0.109 and 0.101 respectively.