| 温度对低碳钢微观组织与高温力学性能的影响 |
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| 引用本文： | 崔桂彬,鞠新华,张清水,杨瑞.温度对低碳钢微观组织与高温力学性能的影响[J].金属热处理,2020,45(5):123-128. |
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| 作者姓名： | 崔桂彬 鞠新华 张清水 杨瑞 |
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| 作者单位： | 首钢集团有限公司技术研究院, 北京 100043 |
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| 摘 要： | 利用场发射扫描电镜(FE-SEM)、电子背散射衍射技术(EBSD)与电子万能试验机对低碳钢不同温度下的微观组织与高温力学性能进行了详细的研究与讨论。结果表明,无论室温拉伸还是高温拉伸,位于晶界上的碳化物(Fe3C)颗粒是诱发低碳钢裂纹的主要因素。与室温拉伸性能相比,提高加热温度,抗拉强度明显下降,伸长率显著增加。在高温下,随着温度的提高,抗拉强度线性下降,而伸长率先降低而后趋于稳定。在520 ℃拉伸过程中,低碳钢中产生了大量的滑移带,诱发了动态回复。提高温度至720 ℃时,珠光体组织发生球化,形变铁素体晶粒内出现等轴状小晶粒,即发生了动态再结晶;经EBSD分析,形变铁素体晶粒间取向差较大,而其发生再结晶的等轴小晶粒间取向差较小。
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| 关 键 词： | 低碳钢 微观组织 高温力学性能 EBSD |
| 收稿时间： | 2019-10-11 |
Effect of temperature on microstructure and high temperature mechanical properties of low carbon steel |
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| Cui Guibin,Ju Xinhua,Zhang Qingshui,Yang Rui.Effect of temperature on microstructure and high temperature mechanical properties of low carbon steel[J].Heat Treatment of Metals,2020,45(5):123-128. |
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| Authors: | Cui Guibin Ju Xinhua Zhang Qingshui Yang Rui |
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| Affiliation: | Shougang Group Company Limited Research Institute of Technology, Beijing 100043, China |
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| Abstract: | The microstructure and high temperature mechanical properties of a low carbon steel at different temperatures were studied and discussed in detail by means of field emission scanning electron microscopy (FE-SEM), electron backscatter diffraction (EBSD) and electronic universal testing machine. The results show that regardless of room temperature tensile test or high temperature tensile test, carbide(Fe3C) particles located on grain boundaries are the main factor for inducing cracks for the tested low carbon steel. Compared with the tensile properties at room temperature, increasing the heating temperature, the tensile strength is significantly reduced and the elongation is significantly increased. At high temperatures, with the increase of temperature, the tensile strength decreases linearly, while the elongation decreases first and then stabilizes. A large number of slip bands are observed during the stretching at 520 ℃, which induces dynamic recovery. When the temperature is increased to 720 ℃, the pearlite structure becomes spheroidized, and the equiaxed small grains appear in the deformed ferrite grains, which means that dynamic recrystallization has occurred. According to the EBSD analysis, the misorientation between the deformed ferrite grains is large, and the misorientation between the equiaxed small grains where recrystallization occurs is small. |
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| Keywords: | low carbon steel microstructure high temperature mechanical properties EBSD |
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