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| 线能量对CHDG-B材料焊接粗晶热影响区组织和性能的影响 |
| Influence of Line Energy on Microstructure and Properties of Welded Heat Affected Zone of CHDG-B Material |
| Received:July 01, 2024 |
| DOI：10.3969/j.issn.1674-6457.2025.05.018 |
| 中文关键词: 焊接粗晶热影响区 热-力模拟 CHDG-B钢 冲击韧性 晶粒尺寸 |
| 英文关键词: welding coarse grain heat affected zone thermal-mechanical simulation CHDG-B steel impact toughness grain size |
| 基金项目:江苏省博士后科研资助计划(1601048C) |
| Author Name | Affiliation | | HU Minglei | CNNC Nuclear Power Operation Management Co., Ltd., Zhejiang Haiyan 314300, China | | ZHANG Wei | CNNC Nuclear Power Operation Management Co., Ltd., Zhejiang Haiyan 314300, China | | XU Ke | CNNC Nuclear Power Operation Management Co., Ltd., Zhejiang Haiyan 314300, China | | HU Bin | CNNC Nuclear Power Operation Management Co., Ltd., Zhejiang Haiyan 314300, China | | CHEN Guang | School of Materials Science and Engineering, Jiangsu University, Jiangsu Zhenjiang 212013, China | | LIU Rencai | School of Materials Science and Engineering, Jiangsu University, Jiangsu Zhenjiang 212013, China | | LI Dongsheng | School of Materials Science and Engineering, Jiangsu University, Jiangsu Zhenjiang 212013, China |
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| 中文摘要: |
| 目的 明确线能量对CHDG-B材料焊接粗晶热影响区组织和性能的影响规律。方法 采用Gleeble3500热力模拟试验机模拟CHDG-B焊接过程中的热循环，研究线能量对CHDG-B粗晶热影响区金相显微组织、晶粒大小、显微硬度、冲击韧性等的影响规律。结果 当线能量为5 kJ/cm和6.5 kJ/cm时，焊接粗晶热影响区晶粒平均尺寸小于母材CHDG-B的晶粒平均尺寸;当线能量为10 kJ/cm和17 kJ/cm时，焊接粗晶热影响区晶粒平均尺寸大于母材CHDG-B的晶粒平均尺寸。当线能量为17 kJ/cm时，焊接粗晶热影响区的析出相不再是弥散分布在晶粒中，析出相对晶界的钉扎作用明显下降，焊接粗晶热影响区晶粒长大。当线能量为5 kJ/cm和6.5 kJ/cm时，焊接粗晶热影响区冲击功值大于母材CHDG-B的冲击功值;当线能量为10 kJ/cm和17 kJ/cm时，焊接粗晶热影响区冲击功值小于母材CHDG-B的冲击功值。当线能量为5 kJ/cm时，析出相数量相对较少、形态呈细小圆球状，在奥氏体晶粒中弥散分布。结论 从控制晶粒尺寸和冲击韧性角度考虑，在焊接CHDG-B时，线能量应小于10 kJ/cm。在本文试验条件下，线能量对CHDG-B焊接粗晶热影响区耐晶间腐蚀能力没有影响。 |
| 英文摘要: |
| The work aims to clarify the influence of line energy on the microstructure and properties of the heat affected zone of coarse grained welding of CHDG-B materials. A Gleeble3500 thermal simulation test machine was used to simulate the thermal cycle during the CHDG-B welding process to investigate the influence of line energy on the metallographic microstructure, grain size, microhardness, and impact toughness of the CHDG-B coarse grain heat-affected zone (HAZ). The results showed that, when the line energy was 5 kJ/cm and 6.5 kJ/cm, the average grain size in the welding coarse grain HAZ was smaller than that of the base material CHDG-B. When the line energy was 10 kJ/cm and 17 kJ/cm, the average grain size in the welding coarse grain HAZ was larger than that of the base material CHDG-B. At a line energy of 17 kJ/cm, the precipitated phase in the welding coarse grain HAZ was no longer dispersed within the grains, and the pinning effect of the precipitated phase on the grain boundaries significantly decreased, leading to grain growth in the welding coarse grain HAZ. When the line energy was 5 kJ/cm and 6.5 kJ/cm, the impact energy value of the welding coarse grain HAZ was greater than that of the base material CHDG-B; when the line energy was 10 kJ/cm and 17 kJ/cm, the impact energy value of the welding coarse grain HAZ was less than that of the base material CHDG-B. When the line energy was 5 kJ/cm, the number of precipitates was relatively small, and they appeared as fine spherical particles dispersed within the austenite grains. From the perspective of controlling grain size and impact toughness, the line energy for welding CHDG-B should be less than 10 kJ/cm. Under the experimental conditions of this paper, the line energy has no effect on the intergranular corrosion resistance of the CHDG-B welding coarse grain HAZ. |
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