| 程翔,鲍峥,王若民,缪春辉,陈国宏,汤文明.高温时效粗、细晶TP347HFG耐热钢管的显微组织与力学性能对比研究[J].装备环境工程,2024,21(10):143-150. CHENG Xiang,BAO Zheng,WANG Ruomin,MIAO Chunhui,CHEN Guohong,TANG Wenming.Comparative Study on Microstructures and Mechanical Properties of the Coarse-/Fine-grainedTP347HFGHeat-resistant Steel Tubes after High-temperature Aging[J].Equipment Environmental Engineering,2024,21(10):143-150. |
| 高温时效粗、细晶TP347HFG耐热钢管的显微组织与力学性能对比研究 |
| Comparative Study on Microstructures and Mechanical Properties of the Coarse-/Fine-grainedTP347HFGHeat-resistant Steel Tubes after High-temperature Aging |
| 投稿时间：2024-04-26 修订日期：2024-06-26 |
| DOI：10.7643/issn.1672-9242.2024.10.018 |
| 中文关键词: TP347HFG耐热钢管 时效 奥氏体晶粒度 第二相 显微组织 力学性能中图分类号:TG142.7 文献标志码:A 文章编号:1672-9242(2024)10-0143-08 |
| 英文关键词:TP347HFG heat-resistant steel tube aging austenite grain grade secondary phase microstructure mechanical property |
| 基金项目:安徽新力电业科技咨询有限责任公司科技项目(2022咨-KJ-02) |
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| Author | Institution |
| CHENG Xiang | Anhui Xinli Electric Technology Consulting Co., Ltd., Hefei 230601, China |
| BAO Zheng | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
| WANG Ruomin | Anhui Xinli Electric Technology Consulting Co., Ltd., Hefei 230601, China |
| MIAO Chunhui | Electric Power Research Institute, Anhui Electric Power Co.Ltd., State Grid, Hefei 230601, China |
| CHEN Guohong | Electric Power Research Institute, Anhui Electric Power Co.Ltd., State Grid, Hefei 230601, China |
| TANG Wenming | School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
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| 中文摘要: |
| 目的 揭示奥氏体晶粒粗化对该钢管服役可靠性的影响。方法 采用预变形加固溶处理工艺制备粗晶试样，以模拟长期高温服役TP347HFG钢管中奥氏体晶粒异常长大状态。开展650 ℃直至3 600 h时效后的粗、细晶TP347HFG钢试样显微组织及力学性能的对比研究。结果 高温时效过程中，粗、细晶试样奥氏体晶粒大小基本保持不变，孪晶密度降低。第二相颗粒析出行为没有明显差异，M23C6相颗粒优先在奥氏体晶界析出、粗化，但粗晶试样中的M23C6相析出更快，粗化更明显。随时效时间延长，粗、细晶试样的室温、高温拉伸力学性能变化趋势基本一致，室温、高温强度变化不明显，但塑性相差较大。经650 ℃时效3 600 h后，粗晶试样600 ℃拉伸时的断后伸长率较细晶试样显著下降了30.4%。结论 粗晶TP347HFG钢管的高温塑性应受到重点关注。 |
| 英文摘要: |
| The work aims to reveal the effect of austenite grain coarsening on the service reliability ofsteel tubes. Coarse-grainedspecimens were prepared via a pre-deformation and solid solution treatment method to simulate the abnormal growth state of the austenite grains of the TP347HFG steel tubes in long-term service. Microstructures and mechanical properties of the coarse-/fine-grained TP347HFG steel specimens aged at 650 ℃ for 3 600 h were comparatively studied. During high-temperature aging, the austenite grain sizes of the coarse-/fine-grained specimenswere almost unchanged, but the twin densities decreased. Secondary phase precipitation was not apparently different. The M23C6 phase particles preferentially precipitated and coarsened at the austenite grain boundaries, which was more severefor the M23C6 phase particles in the coarse-grained specimens. As the aging time prolonged, the variation tendencies of the room-/high-temperature tensile strengths and plasticity of the coarse-/fine-grainedspecimenswere basically consistent. The strengths at room temperature and high temperature did not obviously change, but the plasticity was greatly distinct. After aging at 650 ℃ for 3 600 h, the elongation after fracture at 600 ℃ of the coarse-grained specimendecreased by 30.4% than that of the fine-grained one. More attention should be paid to the high-temperature plasticity of the coarse-grained TP347HFG steel tube. |
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