<strong>Pt-Al</strong>涂层对<strong>DD413</strong>合金高温拉伸性能的影响

doi:10.11900/0412.1961.2022.00241

金属学报

2023, Vol. 59

Issue (3): 424-434 DOI: 10.11900/0412.1961.2022.00241

研究论文

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Pt-Al涂层对DD413合金高温拉伸性能的影响

王迪¹^,², 贺莉丽³, 王栋²(

), 王莉², 张思倩¹, 董加胜², 陈立佳¹, 张健²

1 沈阳工业大学材料科学与工程学院沈阳 110870
2 中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016
3 中国航发南方工业有限公司株洲 412000

Influence of Pt-Al Coating on Tensile Properties of DD413 Alloy at High Temperatures

WANG Di¹^,², HE Lili³, WANG Dong²(

), WANG Li², ZHANG Siqian¹, DONG Jiasheng², CHEN Lijia¹, ZHANG Jian²

1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2 Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 AECC Southern Industrial Limited Company, Zhuzhou 412000, China

引用本文:

王迪, 贺莉丽, 王栋, 王莉, 张思倩, 董加胜, 陈立佳, 张健. Pt-Al涂层对DD413合金高温拉伸性能的影响[J]. 金属学报, 2023, 59(3): 424-434.
Di WANG, Lili HE, Dong WANG, Li WANG, Siqian ZHANG, Jiasheng DONG, Lijia CHEN, Jian ZHANG. Influence of Pt-Al Coating on Tensile Properties of DD413 Alloy at High Temperatures[J]. Acta Metall Sin, 2023, 59(3): 424-434.

全文: PDF(4577 KB) HTML

摘要:

利用SEM和TEM对比研究了无涂层和Pt-Al涂层试样在760和980℃的拉伸性能。研究结果表明：在2个温度下，Pt-Al涂层试样的屈服强度均低于无涂层试样。由于Pt-Al涂层存在韧脆转变温度(ductile to brittle transition temperature，DBTT)，因此在不同温度下涂层表现出不同的变形机制和裂纹萌生方式。在高温下由于β向γ′转变有利于位错产生滑移，从而导致Pt-Al涂层的塑性变形。Pt-Al涂层在DBTT以上拉伸强度的提高是由于Pt在β-NiAl相中起到固溶强化效应。

关键词 ： Pt-Al涂层, 单晶高温合金, 拉伸性能, 韧脆转变温度

Abstract：

The Pt-Al coating is a vital section of aero-engine power blades that can improve the operating temperature of the blade. The blade is subjected to axial tensile stress during operation. Both the oxidation of the Pt-Al coating and the microstructure evolution caused by the element diffusion between the coating and the matrix at high temperatures affect the service performance of the blade. However, the specific mechanisms remain unclear. In this work the effect of Pt-Al coating on the tensile properties of a DD413 alloy was studied. SEM and TEM were used to compare the tensile properties of the uncoated and Pt-Al-coated samples, respectively, at 760 and 980^oC. Lower yield strength was detected in Pt-Al-coated samples than that in uncoated samples at 760 and 980^oC. The different crack initiation modes and deformation mechanisms of Pt-Al coating at 760 and 980^oC mainly result from the ductile to brittle transition temperature (DBTT). At high temperatures, the transition from β to γ′ is conducive to the dislocation slip, which leads to the plastic deformation of the Pt-Al coating. The increase in the tensile strength of the Pt-Al layer above DBTT can be attributed to the solidified solution-strengthening effect of Pt in β-NiAl.

Key words： Pt-Al coating single crystal superalloy tensile property ductile to brittle transition temperature

收稿日期: 2022-05-12

ZTFLH:

TG141

基金资助:国家科技重大专项项目(P2021-A-IV-001-002);国家科技重大专项项目(2017-Ⅵ-0019-0091);国家科技重大专项项目(J2019-Ⅵ-0010-0124);国家科技重大专项项目(51771204)

作者简介: 王迪，男，1984年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00241 或 https://www.ams.org.cn/CN/Y2023/V59/I3/424

图1 拉伸试样示意图

图2 Pt-Al涂层原始表面和纵截面的SEM像

图3 在760和980℃下无涂层和Pt-Al涂层试样的名义应力(σ)-应变(ε)曲线

表1 在760和980℃下无涂层和Pt-Al涂层试样的拉伸性能

图4 在760和980℃下无涂层和Pt-Al涂层试样的拉伸断口表面的SEM像

图5 在760和980℃下Pt-Al涂层试样拉伸断口涂层区域的SEM像

图6 在760和980℃下无涂层和Pt-Al涂层试样[001]方向拉伸断口纵截面的SE和BSE像

图7 在760和980℃下Pt-Al涂层试样拉伸断口截面腐蚀后的BSE像

表2 Pt-Al涂层试样拉伸实验前后截面组织厚度 (μm)

图8 在760和980℃下无涂层和Pt-Al涂层试样[001]方向拉伸变形组织的SEM像

图9 无涂层和Pt-Al涂层试样在760和980℃下拉伸断口的位错形态TEM像

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