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| 厚规格多相组织X80管线钢组织控制与断裂行为研究 |
| Microstructures and Fracture Behaviors in Heavy Thick Multi-phase X80 Pipeline Steel |
| Received:July 12, 2018 Revised:November 10, 2018 |
| DOI：10.3969/j.issn.1674-6457.2018.06.008 |
| 中文关键词: X80管线钢 力学性能 断裂行为 微观组织 |
| 英文关键词: X80 pipeline steel mechanical property microstructure fracture behavior |
| 基金项目: |
| Author Name | Affiliation | | GAO Yan | 1. Nanjing Iron and Steel Co., Ltd., Nanjing 210035, China | | JIANG Jin-xing | 1. Nanjing Iron and Steel Co., Ltd., Nanjing 210035, China | | ZUO Xiu-rong | 2. Key Laboratory of Material Physics, Ministry of Education, Zhengzhou University, Zhengzhou 450052, China | | HONG Liang | 2. Key Laboratory of Material Physics, Ministry of Education, Zhengzhou University, Zhengzhou 450052, China | | WANG Hui-hui | 2. Key Laboratory of Material Physics, Ministry of Education, Zhengzhou University, Zhengzhou 450052, China |
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| 中文摘要: |
| 目的 研究厚规格X80管线钢的力学性能及断裂行为与微观组织之间的关系。方法 通过硬度实验、拉伸实验、夏比冲击实验及落锤撕裂实验（DWTT），研究X80管线钢力学性能，利用OM和SEM观察微观组织和断口形貌。结果 多边形铁素体（PF）、粒状贝氏体（GB）、准多边形铁素体（QPF）、针状铁素体（AF）和贝氏体铁素体（BF）多相组织的结合保证了钢板优异的强韧性。在落锤撕裂实验裂纹扩展过程中，裂纹扩展至QPF时呈平直扩展，裂纹扩展至GB时，较为曲折迂回，说明GB能有效阻碍裂纹扩展。细小的马氏体-奥氏体（M-A）组元和AF同样能够有效阻碍裂纹的扩展。结论 研究结果可为厚规格多相组织X80级管线钢的服役使用提供理论依据。 |
| 英文摘要: |
| The paper aims to study the relations between mechanical properties and fracture behaviors of the heavy thick X80 pipeline steel. Mechanical properties of X80 pipeline steel were studied with hardness tester, tensile tester and impact tester, respectively. Microstructure and fracture appearances were observed with Scanning Electron Microscopy and Optical Microscopy. The results showed that combination of polygonal ferrite (PF), granular bainite (GB), quasi-polygonal ferrite (QPF), acicular ferrite (AF) and bainite ferrite (BF) guaranteed excellent strength and toughness. Crack propagating across the QPF remained quite close to a straight line, crack propagating across the GB kinked and meandered significantly, indicating that GB provided a significant barrier to crack propagation. AF and the fine martensite-austenite (MA) constituent could be an effective barrier for crack propagation. The research results provide a theoretical basis for safe use of heavy thick multi-phase X80 pipeline steel. |
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