邢玉涵,尹瀛月,张建华,岳晓明.选区激光熔化制备Hastelloy X合金耐腐蚀性能研究[J].表面技术,2024,53(6):67-79.
XING Yuhan,YIN Yingyue,ZHANG Jianhua,YUE Xiaoming.Corrosion Resistance of SLM-fabricated Hastelloy X Alloy[J].Surface Technology,2024,53(6):67-79 |
| 选区激光熔化制备Hastelloy X合金耐腐蚀性能研究 |
| Corrosion Resistance of SLM-fabricated Hastelloy X Alloy |
| 投稿时间：2023-03-24 修订日期：2023-07-03 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.06.006 |
| 中文关键词: 选区激光熔化 电化学加工 Hastelloy X合金 微观结构 电化学行为 |
| 英文关键词:laser selective melting electrochemical machining Hastelloy X alloy microstructure electrochemical behavior |
| 基金项目:国家重点研发计划(2021YFF0501700) |
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| Author | Institution |
| XING Yuhan | School of Mechanical Engineering, Shandong University, Jinan 250061, China;National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education of China, Jinan 250061, China |
| YIN Yingyue | School of Mechanical Engineering, Shandong University, Jinan 250061, China;National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education of China, Jinan 250061, China |
| ZHANG Jianhua | School of Mechanical Engineering, Shandong University, Jinan 250061, China;National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education of China, Jinan 250061, China |
| YUE Xiaoming | School of Mechanical Engineering, Shandong University, Jinan 250061, China;National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education of China, Jinan 250061, China |
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| 中文摘要: |
| 目的 研究低电流密度下电化学加工过程中选区激光熔化(SLM)制备Hastelloy X合金微观组织结构对其耐腐蚀特性的影响，为抑制低电流密度条件下电化学加工Hastelloy X合金表面杂散腐蚀奠定理论基础。方法 利用配备有电子背散射衍射系统的扫描电子显微镜和电子探针X射线显微分析仪研究SLM制备和锻造成形的Hastelloy X合金微观结构的差异，对比开路电位和极化曲线的测量结果，确定低电流密度下的ECM最优工艺参数，分析2种成形工艺制备Hastelloy X合金动电位极化曲线中的关键电化学参数，获得低电流密度下ECM过程中微观组织特征对SLM制备和锻造Hastelloy X合金耐蚀性能的影响规律。结果 与商用锻造Hastelloy X合金相比，SLM制备Hastelloy X合金具有精细的晶粒尺寸以及更小的再结晶比例，锻造Hastelloy X合金晶界和晶内析出了大量弥散分布的M23C6型碳化物。在优化的工艺参数条件下，SLM制备Hastelloy X合金在36 ℃的10%(质量分数)NaNO3电解液中具有较小的自腐蚀电流密度(2.01× 10−6 A/cm2)和钝化电流密度(3.01×10−5 A/cm2)。结论 SLM制备Hastelloy X合金在电化学加工过程中具有较高的耐腐蚀性能，能有效抑制杂散腐蚀现象，进而达到提高加工精度的目的。通过分析微观组织对SLM制备Hastelloy X合金耐腐蚀特性的影响规律，为电化学加工过程中抑制镍基高温合金的杂散腐蚀现象奠定了基础。 |
| 英文摘要: |
| Electrochemical machining is a kind of non-traditional technology for the machining of difficult-to-cut alloy. It is widely used in modern industry by machining complex shape work pieces based on the electrochemical anodic dissolution reaction principle. The problem of low machining accuracy is normally caused by stray corrosion in electrochemical machining. In this paper, the effect of the microstructure on the corrosion resistance of SLM-fabricated Hastelloy X alloy during electrochemical machining (ECM) at low current density was investigated. A theoretical foundation was built to prevent stray corrosion on the surface of Hastelloy X alloy during electrochemical machining at low current density, and an outstanding machining accuracy was obtained. Scanning electron microscope images, Electron Backscatter Diffraction images and Electron probe X-ray microanalyser images of SLM-fabricated and wrought Hastelloy X alloy, were obtained with a scanning electron microscope and an electron probe X-ray microanalyzer equipped with electron backscattering diffraction. By analyzing the images of SLM-fabricated and wrought Hastelloy X alloy, it was found that there were differences in average grain size, subgrain boundary content and surface carbide precipitation. The optimized process parameters were determined by the compared measurement results of open circuit potential and polarization curve under low current density. Through integrating the temperature control and energy angle, the optimal process parameters of electrochemical machining under low current density were finally determined, so as to ensure that the alloy could be dissolved efficiently and stably without causing serious electrolyte loss and other problems resulting in energy waste. Key electrochemical parameters such as self-corrosion potential, passivation current density, polarization resistance, breakdown potential, were analyzed in the potentiodynamic polarization curves of SLM-fabricated and wrought Hastelloy X alloy, obtaining the influence law of microstructure characteristics on the corrosion resistance of SLM-fabricated and wrought Hastelloy X alloy during ECM processing at low current density. The results showed that SLM-fabricated Hastelloy X alloy had a finer grain size and less recrystallization ratio in comparison with the wrought counterparts. And a large number of dispersed M23C6 carbides were precipitated in the grain boundary and intragranular of the wrought Hastelloy X alloy. In addition, the SLM-fabricated Hastelloy X alloy existed a little corrosion current density of 2.01×10−6 A/cm2 and passive current density of 3.01×10−5 A/cm2 at the optimized processing parameter condition. Based on experimental results, it is concluded that SLM-fabricated Hastelloy X alloy has a finer microstructure and no M23C6 carbide precipitation, leading to lower self-etching current density and passivation current density compared with wrought Hastelloy X alloy under the same conditions. Therefore, it has higher anode passivation characteristics and higher corrosion resistance, and the passivation film is thicker and denser. The SLM-fabricated Hastelloy X alloy has high corrosion resistance in electrochemical machining, which can effectively inhibit the phenomenon of stray corrosion, and then achieve the purpose of improving the machining accuracy. The effect of microstructure on corrosion resistance of SLM-fabricated Hastelloy X alloy is analyzed and discussed in this paper, which lays a foundation for suppressing stray corrosion of nickel-based superalloy in the actual processing of electrochemical machining. |
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