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W 元素添加对含 Mn β 凝固 γ-TiAl 合金高温抗氧化性影响
Effect of the W Element Addition on the High-temperature Oxidation Resistance of Mn-containing β-solidifying γ-TiAl Alloys
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- DOI:
- 作者:
- 刘佳聪 1，2，郝俊杰 2，李卫臣 2，张智鑫 3，薛 鹏 2，王建军 1，李小兵 2
LIU Jiacong1,2, HAO Junjie2, LI Weichen2, ZHANG Zhixin3, XUE Peng2, WANG Jianjun1, LI Xiaobing2
- 作者单位:
- 1. 东北大学 材料科学与工程学院，辽宁 沈阳 110819；2. 季华实验室 材料科学与技术研究部，广东 佛山 528200；3. 西 安宝钛新材料科技有限公司，陕西 西安 710072
1. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; 2. Department of Materials Science and Technology, Ji Hua Laboratory, Foshan 528200, China; 3. Xi'an Baoti New Material Technology Co., Ltd., Baoji 710072, China
- 关键词:
- TiAl 合金；合金化；元素 W；高温氧化性；过渡层
TiAl alloy; alloying; W element; high-temperature oxidation resistance; transition layer
- 摘要:
- β 凝固 γ-TiAl 合金因含 Mn 等 β 相稳定元素兼具低成本、良好热加工性与耐磨性。 但 Mn 会在高温氧化时发生选择性氧化，损害氧化膜致密性，恶化其抗氧化能力。 因此，以铸态 Ti43Al1.5Mn3Nb 及 Ti43Al1.5Mn3Nb-0.4W 合金(简称 TMN 与 TMNW)为对象，探究其 850 ℃下循环氧化、恒温氧化行为。 循环氧化后，TMN 氧化增重(1.34 mg/cm2)与氧化膜厚(11.12 μm)均大于 TMNW(0.98 mg/cm2, 8.12 μm)，二者均无氧化膜脱落。 恒温氧化后，二者氧化膜均脱落，TMN 氧化增重(3.33 mg/cm2)与脱落量(6.71 mg/cm2)均大于 TMNW(2.98 mg/cm2, 4.05 mg/cm2)。 分析发现，两种合金氧化膜结 构 均 为 TiO2-Al2O3-TiO2/Al2O3- 富 Mn/Nb/N 四 层结 构 。 氧化 膜 与 基 体 间 的过 渡 层 从 外 到 内 依 次 是 TiN、Ti2AlN、Laves-(Ti, Nb)(Mn, Al)2。 0.4%(原子分数)W 的加入可促进致密氧化膜形成，维持过渡层稳定，提高氧化膜的抗剥落性能。β-solidifying γ-TiAl alloys contain β-phase stabilizing elements such as Mn, exhibiting low cost, excellent hot workability and wear resistance. However, the selective oxidation of Mn during high-temperature oxidation impairs the compactness of the oxide film and deteriorates the oxidation resistance. On this basis, as-cast TMN (Ti43Al1.5Mn3Nb) and TMNW (Ti43Al1.5Mn3Nb-0.4W) alloys were taken as research objects to investigate their oxidation behavior at 850 ℃ and the effect of W addition on oxidation behavior. After cyclic oxidation, the oxidation weight gain (1.34 mg/cm2) and oxide film thickness (11.12 μm) of the TMN alloy are both higher than those of the TMNW alloy (0.98 mg/cm2, 8.12 μm), with no oxide film spallation observed. After isothermal oxidation, oxide film spallation occurs in both alloys, and the oxidation weight gain (3.33 mg/cm2) and spalling mass (6.71 mg/cm2) of TMN are higher than those of TMNW (2.98 mg/cm2 and 4.05 mg/cm2, respectively). The oxide films of both alloys present a four-layer structure: TiO2-Al2O3-TiO3/Al2O3- Mn/Nb/N-enriched the layer. The transition layer between the oxide film and matrix consisted of TiN, Ti2AlN and Laves- (Ti, Nb)(Mn, Al)2 from outside to the inside. The addition of 0.4 at.% W promotes the formation of a compact oxide film, maintaining the stability of the transition layer and improving the spall resistance of the oxide film.