TiC precipitation induced effect on microstructure and mechanical properties in low carbon medium manganese steel
TiC precipitation induced effect on microstructure and mechanical properties in low carbon medium manganese steel
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DOI：
10.1016/j.msea.2011.10.037
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发表时间：
2011-12-15
期刊：
影响因子：
6.4
通讯作者：
Dong, H.
中科院分区：
文献类型：
--
作者：
Han, Y.;Shi, J.;Dong, H.
研究了低碳中锰钢中不同工艺处理钛的析出行为及其对显微组织和力学性能的影响。结果发现，回火和再加热淬火过程中形成的析出物均为TiCs。它们的尺寸主要分别为1至18纳米和1至36纳米。回火处理尤其促进了TiC直径峰值达到5 nm，但也促进了部分析出物沿晶界形核。 TiC 的析出有助于细化奥氏体晶粒，这种效果取决于再加热温度。当再加热温度为900℃时，平均晶粒尺寸可细化至7.8μm。此外，还发现机械性能由再加热-淬火工艺决定。但在相同的再加热温度下，回火对其几乎没有影响。结果表明，TiC析出引起的位错强化机制是强度和韧性变化的主导因素。 (C) 2011 Elsevier B.V. 保留所有权利。
The precipitation behavior of titanium treated by different processes and its effect on microstructure and mechanical properties has been investigated in low carbon medium manganese steel. It is found that the formed precipitates during both tempering and reheating-quenching processes are TiCs. The size of them mainly ranges from 1 to 18 nm and 1 to 36 nm, respectively. And tempering treatment especially promotes a peak of TiC in diameter from to 5 nm, but it also boosts parts of precipitates nucleating along the grain boundaries. The precipitation of TiC is useful for the refinement of austenite grains and this effect depends on the reheating temperature. The mean grain size can be refined to 7.8 mu m when the reheating temperature is 900 degrees C. Furthermore, it is found that the mechanical properties are determined by the reheating-quenching process. However, the tempering has nearly no influence on it when the sample is treated by the same reheating temperature. It is concluded that dislocation strengthening mechanism induced by TiC precipitation is the dominant factor for the changes of both strength and toughness. (C) 2011 Elsevier B.V. All rights reserved.