徐朝晖,许雅南,游小刚,等.电子束精炼GH4068高温合金的除杂工艺及机制研究[J].精密成形工程,2023,15(11):179-186.
XU Zhao-hui,XU Ya-nan,YOU Xiao-gang,et al.Impurity Removal Process and Mechanism of Electron Beam Refining GH4068 Superalloy[J].Journal of Netshape Forming Engineering,2023,15(11):179-186. |
| 电子束精炼GH4068高温合金的除杂工艺及机制研究 |
| Impurity Removal Process and Mechanism of Electron Beam Refining GH4068 Superalloy |
| 投稿时间：2023-05-11 |
| DOI：10.3969/j.issn.1674-6457.2023.011.021 |
| 中文关键词: 电子束精炼 GH4068 Ni-Co基高温合金 除杂 |
| 英文关键词: electron beam refining GH4068 Ni-Co base superalloy impurity removal |
| 基金项目:国家重点研发计划(2019YFA0705300) |
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| 中文摘要: |
| 目的 探究电子束精炼法对GH4068合金中夹杂物去除行为的影响。方法 用电子束熔炼设备对常规冶炼法制备的GH4068高温合金进行了精炼，使用扫描电子显微镜(SEM)及其配备的能谱(EDS)功能探究了合金中夹杂物的形貌、成分、数量及尺寸，并用AZtec软件进行了统计分析。结果 在GH4068合金中，含量最多的夹杂物为Al2O3-TiN复合型夹杂物，其次为氧化物、氮化物以及少量的碳氮化物。经电子束精炼后，合金中的O含量、N含量、夹杂物的数量密度和面积密度以及最大夹杂物尺寸均有所降低;当精炼参数为12 kW-30 min时，精炼效果最佳，合金中的氧的质量分数降低到6.50×10−6(下降了80.06%)，氮的质量分数降低到0.13×10−6(下降了95.00%)，夹杂物的数量密度和面积密度分别降低到21.99个/mm2和34.08 μm2/mm2(分别降低了45.62%和52.40%)，最大夹杂物面积降低到12.59 μm2(母材面积为50.23 μm2)，GH4068的纯净度得到了显著提高。结论 电子束精炼法有良好的除杂效果，且除杂效果随功率的升高呈现出先增强后减弱的趋势，GH4068合金的最佳精炼工艺参数为12 kW-30 min。 |
| 英文摘要: |
| The work aims to investigate the effect of electron beam refining on the removal behavior of inclusions in GH4068 alloy. The conventional smelting GH4068 superalloy was refined by electron beam melting equipment. The morphologies, compositions, amounts and sizes of inclusions in the alloy were investigated by Scanning Electron Microscope (SEM) and its equipped Energy Dispersive Spectroscopy (EDS), and the statistical analysis was made by AZtec software. The most inclusions in GH4068 alloy were Al2O3-TiN composite inclusions, followed by oxides, nitrides and a small amount of carbo-nitride. The contents of O and N, the number and area of inclusions and the maximum size of inclusions in the alloy were reduced after electron beam refining. The refining effect was the best when the refining parameters were 12 kW-30 min and the oxygen content in the alloy was reduced to 6.50×10−6 (decreased by 80.06%), the nitrogen content was reduced to 0.13×10−6 (decreased by 95.00%), the number and area density of inclusions were reduced to 21.99 nos/mm2 and34.08 μm2/mm2 (decreased by 45.62% and 52.40%) respectively, and the maximum inclusion size was reduced to 12.59 μm2 (base material:50.23 μm2), significantly improving the purity of GH4068. Electron beam refining has a good impurity removal effect, and the impurity removal effect firstly increases and then decreases with the increase of power. The optimum refining process of GH4068 alloy is 12 kW-30 min. |
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