| 长期时效对20Cr1Mo1VTiB螺栓钢的组织和力学性能的影响 |
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| 引用本文： | 赵孟雅,彭涛,赵吉庆,杨钢,杨滨. 长期时效对20Cr1Mo1VTiB螺栓钢的组织和力学性能的影响[J]. 材料研究学报, 2020, 34(5): 321-327. DOI: 10.11901/1005.3093.2019.361 |
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| 作者姓名： | 赵孟雅 彭涛 赵吉庆 杨钢 杨滨 |
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| 作者单位： | 1.北京科技大学钢铁共性技术协同创新中心 北京 1000832.钢铁研究总院特殊钢研究所 北京 100081 |
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| 基金项目： | 国家高技术研究发展计划(2016YFB0300203)。 |
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| 摘 要： | 对20Cr1Mo1VTiB螺栓钢进行拉伸和冲击实验、TEM和SEM观测并测量其XRD谱,研究了其在500℃进行0~2000 h时效处理后的组织和力学性能。结果表明:随着时效时间的增加原板条状贝氏体分成若干个包体,其平均尺寸由时效前的14μm减小到时效2000 h后的9μm。在0~2000 h时效过程中碳化物尺寸没有明显增大,主要析出相VC和Ti C弥散分布在晶内、板条界和板条内。VC相呈椭球状,随时效时间的延长TiC相由长条状变为方形。随着时效时间的延长贝氏体板条的边界逐渐模糊,时效2000 h后板条的宽度明显增加。在长时间时效过程中20Cr1Mo1VTiB螺栓钢的力学性能没有大幅度的变化而保持着较高的值,表明其可在高温下长期使用。
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| 关 键 词： | 金属材料 弥散强化 长期时效 力学性能 |
| 收稿时间： | 2019-07-19 |
Effect of Long-term Aging on Microstructure and Mechanical Properties of 20Cr1Mo1VTiB Bolt Steel |
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| ZHAO Mengya,PENG Tao,ZHAO Jiqing,YANG Gang,YANG Bin. Effect of Long-term Aging on Microstructure and Mechanical Properties of 20Cr1Mo1VTiB Bolt Steel[J]. Chinese Journal of Materials Research, 2020, 34(5): 321-327. DOI: 10.11901/1005.3093.2019.361 |
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| Authors: | ZHAO Mengya PENG Tao ZHAO Jiqing YANG Gang YANG Bin |
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| Affiliation: | (Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;Institute for Special Steels,Central Iron&Steel Research Institute,Beijing 100081,China) |
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| Abstract: | The 20Cr1Mo1VTiB bolt steel was aged at 500℃ for 0~2000 h and then the effect of long-term aging on microstructure and mechanical properties were investigated by means of TEM, SEM, XRD, tensile- and impact-tester. Results show that the lath bainite in the steel was divided into several packets during the aging process. The size of the bainite package in the steel decreased from 13 μm before aging to 9 μm after aged for 2000 h. The main precipitates VC and TiC in the steel dispersed in the intragranular, lath boundaries and inside lath bainite after the aging process. TiC changed from a long strip to a square shape with an extension of the aging time. The boundary of bainite slabs gradually blurred with the increase of aging time, and the width of lath increased obviously after 2000 h aging. After aging for 2000 h the 20Cr1Mo1VTiB bolt steel still has high strength and toughness, therefore, which is suitable for long term service at high temperature. |
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| Keywords: | metallic materials diffusion strengthening long-term aging tensile property |
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