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| 热变形对CLAM钢多尺度组织的影响研究 |
| Effect of Thermal Deformation on Multi-scale Structure of CLAM Steel |
| Received:January 28, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.10.018 |
| 中文关键词: CLAM钢 热变形 马氏体 位错 显微组织 |
| 英文关键词: CLAM steel thermal deformation martensite dislocation microstructure |
| 基金项目:黔科合基础(ZK[2022]023，[2020]1Z046) |
| Author Name | Affiliation | | YU Jie | School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
High Performance Metal Structural Materials and Manufacturing Technology National Local Joint Engineering Laboratory, Guiyang 550025, China | | ZHAO Fei | School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
High Performance Metal Structural Materials and Manufacturing Technology National Local Joint Engineering Laboratory, Guiyang 550025, China | | XU Fahong | Guizhou Special Equipment Inspection and Testing Institute, Guiyang 550000, China | | XIONG Suiping | Guizhou Special Equipment Inspection and Testing Institute, Guiyang 550000, China | | YANG Ming | School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
Guizhou Special Equipment Inspection and Testing Institute, Guiyang 550000, China | | HUANG Wensen | School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
Guizhou Special Equipment Inspection and Testing Institute, Guiyang 550000, China |
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| 中文摘要: |
| 目的 明确热变形对CLAM钢多尺度组织的影响规律，进而为采用形变热处理工艺获取细小弥散的析出相提供指导。方法 利用光学显微镜(OM)、扫描电子显微镜(SEM)、电子背散射衍射(EBSD)及X射线衍射(XRD)研究了CLAM钢在不同变形温度(550、650、750、850 ℃)和不同变形量(30%、45%、60%)下多尺度组织的变化规律。结果 当变形量一致(30%)时，CLAM钢在变形温度为550 ℃时达到最大位错密度(2.69×1015 m–2)与最大界面长度(19 910.3 μm);在变形温度为750℃时，达到最小位错密度(2.53×1015 m–2);在变形温度为850 ℃时，达到最小界面长度(12 594.3 μm)。当变形温度一致(850 ℃)时，CLAM钢在变形量为60%时达到最小晶粒尺寸(53.24 μm)、最大位错密度(4.22×1015 m–2)和最大界面长度(20 657.8 μm)。结论 CLAM钢在热变形过程中发生了回复，并在变形温度为850 ℃时发生了再结晶。当变形量一致时，随着变形温度的提升，位错回复与界面迁移加速，使位错密度及界面长度逐渐降低。但是当变形温度达850 ℃时，受到高温淬火的影响(淬火温度与变形温度一致)，位错密度出现异常增大。通过建立变形温度与位错密度的关系模型，计算出CLAM钢在850 ℃下因淬火畸变造成的位错增殖为(0.53±0.09)×1015 m–2。当变形温度一致时，随着变形量的增加，加工硬化得到提高，多尺度组织得到细化，使位错密度及界面长度逐渐增大，同时再结晶的驱动力得到增加，使晶粒尺寸逐渐减小。 |
| 英文摘要: |
| The work aims to clarify the influence of hot deformation on the multi-scale microstructure of CLAM steel, and provide guidance for improving the high temperature mechanical properties by thermomechanical treatment process. In this paper, optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and X-ray diffraction (XRD) were used to study the multi-scale microstructure of CLAM steel at different deformation temperature (550, 650, 750, 850 ℃) and different deformation (30%, 45%, 60%). The results showed that when the deformation amount was consistent (30%), the maximum dislocation density (2.69×1015 m–2) and the maximum boundary length (19 910.3 μm ) of CLAM steel were reached at 550 ℃; The minimum dislocation density (2.53×1015 m–2) was achieved at 750 ℃; The minimum boundary length (12 594.3 μm) was achieved at 850 ℃. When the deformation temperature was consistent (850 ℃), the CLAM steel reached the minimum grain size (53.24 μm);The maximum dislocation density (4.22×1015 m–2) and the maximum boundary length (20 657.8 μm) were achieved when the deformation degreewas 60%. The recovery of CLAM steel occurred during hot deformation and recrystallization occurred at 850 ℃. When the deformation degreeis consistent, with the increase of deformation temperature, the recovery of dislocation and the migration of boundary are accelerated, so that the dislocation density and boundary length are gradually reduced. However, when the deformation temperature reaches 850 ℃, the dislocation density increases abnormally due to the influence of high temperature quenching (the quenching temperature is consistent with the deformation temperature). By establishing a relationship model between deformation temperature and dislocation density, the dislocation multiplication caused by quenching distortion of CLAM steel at 850 ℃ is calculated to be (0.53±0.09)×1015 m–2. When the deformation temperature is consistent, with the increase of deformation, the work hardening is improved, the multi-scale structure is refined, the dislocation density and the boundary length are gradually increased, and the driving force of recrystallization is increased, so that the grain size is gradually reduced. |
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