王立闻,陈旭东,王俊,冯铄,汤瑞,莫堃,官雪梅,张强升,蔡振兵.核用2.25Cr-1Mo钢在不同环境下的微动磨损性能[J].表面技术,2023,52(3):161-171.
WANG Li-wen,CHEN Xu-dong,WANG Jun,FENG Shuo,TANG Rui,MO Kun,GUAN Xue-mei,ZHANG Qiang-sheng,CAI Zhen-bing.Fretting Wear Properties of Nuclear 2.25Cr-1Mo Steel in Different Environments[J].Surface Technology,2023,52(3):161-171 |
| 核用2.25Cr-1Mo钢在不同环境下的微动磨损性能 |
| Fretting Wear Properties of Nuclear 2.25Cr-1Mo Steel in Different Environments |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.03.013 |
| 中文关键词: 2.25Cr-1Mo钢 传热管 液态钠 不同环境 微动磨损 磨损机制 |
| 英文关键词:2.25Cr-1Mo steel heat transfer tube liquid sodium different environments fretting wear wear mechanism |
| 基金项目:四川省科技项目(2022ZYD0029，2022JDJQ0019);国家自然科学基金(U2067221) |
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| Author | Institution |
| WANG Li-wen | DEC Academy of Science and Technology Co., LTD, Chengdu 611731, China |
| CHEN Xu-dong | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
| WANG Jun | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
| FENG Shuo | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
| TANG Rui | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
| MO Kun | DEC Academy of Science and Technology Co., LTD, Chengdu 611731, China |
| GUAN Xue-mei | DEC Academy of Science and Technology Co., LTD, Chengdu 611731, China |
| ZHANG Qiang-sheng | Nuclear and Radiation Safety Center, MEE, Beijing 100082, China |
| CAI Zhen-bing | Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China |
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| 中文摘要: |
| 目的 研究核用2.25Cr-1Mo钢在不同环境下的微动磨损性能。方法 采用自制的切向微动磨损试验设备，在4种环境(温室RT/大气、RT/水、450 ℃/大气和450 ℃/液态钠)下对2.25Cr-1Mo钢进行了切向微动磨损试验。试验参数为:法向载荷20 N，运动频率5 Hz，位移幅值50 μm，循环次数105和2×105。试验前，采用维氏硬度仪测量了2.25Cr-1Mo钢在室温和450 ℃高温下的硬度。试验后，采用Bruker白光干涉显微镜测量了磨痕的三维形貌并获得了截面轮廓和磨损量。采用扫描电子显微镜(SEM)、能谱仪(EDS)分析磨痕表面和横截面的微观形貌以及摩擦化学反应。结果 2.25Cr-1Mo钢在不同环境下表现出不同的磨损性能。450 ℃液态钠环境下的磨损量最大，大于450 ℃和室温大气环境下的磨损量;室温水环境下的磨损最小。经过105微动循环后，2.25Cr-1Mo钢在450 ℃液态钠和室温水环境下表现出最大和最小的磨损率，分别为4.17×10‒6 mm3/(N.m)和0.32×10‒6 mm3/(N.m)。结论 2.25Cr-1Mo钢在室温大气环境下的磨损机制为分层、剥落和氧化磨损;随着温度升高到450 ℃，大气环境下的氧化磨损加剧，伴随着剥层和“锻造流线”;室温水环境下的磨损机制为磨粒磨损和氧化磨损;450 ℃液态钠环境下的磨损机制为磨粒磨损、黏着磨损和“锻造流线”，同时钠的腐蚀协同作用也加速了材料的失效。 |
| 英文摘要: |
| In the steam generator of a sodium-cooled fast reactor, the fretting wear occurs between the heat transfer tubes and their anti-vibration bars due to the flow of the liquid sodium. In this study, the fretting wear behaviors of 2.25Cr-1Mo steel (candidate material for heat transfer tubes in sodium-cooled fast reactors) were investigated by using a self-made multi- atmosphere tangential fretting test rig. In order to simulate the actual working conditions of the heat transfer tube, a 450 ℃/liquid sodium environment was set. Three comparative environments, room temperature (RT)/air, RT/water, and 450 ℃/air, were used to comprehensively evaluate the wear behaviors of 2.25Cr-1Mo steel in different environments. The test adopts the form of tube/rod orthogonal point contact, and the test parameters are as follows:the normal load is 20 N; the frequency is 5 Hz; the displacement amplitude is 50 μm; the number of cycles is 105 and 2×105. Before the test, the hardness of 2.25Cr-1Mo steel at RT and 450 ℃ was tested by a Vickers hardness tester. After the test, the three-dimensional morphology of the wear scar was measured by Bruker white light interference microscope, and the cross-sectional profile and wear volume were obtained. Scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to analyze the micromorphology and tribo-chemical reaction of the wear scar surface and cross-sectional. Results show that the hardness of 2.25Cr-1Mo steel will decrease significantly at 450 ℃, and exhibits different wear properties in different environments. The 2.25Cr-1Mo steel has the worst wear resistance in liquid sodium at 450 ℃, while the best wear resistance in water at RT. The sodium reduces the lubricating oxide layer to metal, accelerating the wear, while the water lubricates and reduces wear. Therefore, the wear rate of 2.25Cr-1Mo steel is the largest in liquid sodium at 450 ℃ (4.17×10‒6 mm3/(N.m)) and the smallest in water at RT (0.32×10‒6 mm3/(N.m)). The wear resistance of 2.25Cr-1Mo steel in the air is affected by the temperature. In the first 105 cycles (early severe wear stage), the wear rate at RT is smaller, and in the last 105 cycles (late stable wear stage), the wear rate at 450 ℃ is even smaller. In the early stage of wear, the 2.25Cr-1Mo steel at high temperature is more easily deformed and peeled off under the combined action of thermal effect and mechanical force, so a larger wear volume is measured, while in the later stage of wear, the material under high temperature is more likely to produce a thicker "glaze layer" at the wear interface, which has lubricating and anti-friction properties. Finally, the main wear mechanism of 2.25Cr-1Mo steel in the air at RT is delamination, spalling and oxidative wear; as the temperature rises to 450 ℃, the oxidative wear in the air intensifies, accompanied by delamination and "forging flow lines"; and in water at RT is abrasive wear and oxidative wear; and in liquid sodium at 450 ℃ is abrasive wear, adhesive wear and "forging flow lines |
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