长期时效对低膨胀高温合金<strong>GH2909</strong>性能的影响

doi:10.11901/1005.3093.2020.314

材料研究学报

2021, Vol. 35

Issue (5): 330-338 DOI: 10.11901/1005.3093.2020.314

研究论文

本期目录 | 过刊浏览

长期时效对低膨胀高温合金GH2909性能的影响

徐雄¹^,², 李钊², 万志鹏², 韦康², 王涛²(

), 张新房¹(

)

^1.北京科技大学冶金与生态工程学院北京 100083
^2.中国航发北京航空材料研究院先进高温结构材料重点实验室北京 100095

Effect of Long-term Aging on Properties of Low Expansion Superalloy GH2909

XU Xiong¹^,², LI Zhao², WAN Zhipeng², WEI Kang², WANG Tao²(

), ZHANG Xinfang¹(

)

^1.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
^2.Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

引用本文:

徐雄, 李钊, 万志鹏, 韦康, 王涛, 张新房. 长期时效对低膨胀高温合金GH2909性能的影响[J]. 材料研究学报, 2021, 35(5): 330-338.
Xiong XU, Zhao LI, Zhipeng WAN, Kang WEI, Tao WANG, Xinfang ZHANG. Effect of Long-term Aging on Properties of Low Expansion Superalloy GH2909[J]. Chinese Journal of Materials Research, 2021, 35(5): 330-338.

全文: PDF(39282 KB) HTML

摘要:

将低膨胀高温合金GH2909分别在500℃、600℃和650℃时效2000 h，研究了长期时效对合金组织和性能的影响。结果表明：GH2909合金在550℃和600℃时效2000 h后其组织稳定性较高，强度略有提高，塑性基本不变。而在650℃时效2000 h后合金的拉伸强度明显降低，室温塑性下降，尤其是在室温下断面收缩率明显降低，但是高温塑性却显著提高。其原因是，GH2909合金在650℃长期时效过程中析出了大量贯穿晶粒且呈魏氏组织形貌的针状ε/ε″相，而强化相γ′相明显减少。同时，在该温度下γ′相明显长大且其稳定性下降。

关键词 ：金属材料, GH2909合金, 显微组织, 长期时效, 力学性能

Abstract：

The microstructure and mechanical properties of a new type of low expansion superalloy GH2909 after long time exposure up to 2000 h at 550℃, 600℃ and 650℃ respectively were investigated. The results show that the alloy had a good microstructure stability and high mechanical properties, namely a slightly increase in strength and little change in plasticity, after aging at 550℃ and 600℃ for 2000 h. However, after 2000 h aging at 650℃ the mechanical properties of the alloy dropped significantly: the strength at room temperature and high temperature decreased significantly, and the plasticity decreased at room temperature, especially the reduction of area at room temperature decreased sharply, but the plasticity increased significantly at high temperature. This is mainly due to the precipitation of a large number of needle-like ε/ε″ phases that penetrate the grains and have "Widmanstatten structure"-like morphology in the microstructure of the alloy during the long-term aging process at 650℃, resulting in a significant reduction in the quantity of strengthening phase γ′ phases. At the same time, the stability of γ′ phase decreases at 650℃ and the size of γ′ phase increases significantly.

Key words： metallic materials GH2909 superalloy microstructure long-time aging mechanical properties

收稿日期: 2020-07-27

ZTFLH:

TG113

基金资助:重点实验室基金(6142903190205);国家自然科学基金(U1860206);中央高校基本科研业务费(FRF-TP-20-02B)

作者简介: 徐雄，男，1996年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.314 或 https://www.cjmr.org/CN/Y2021/V35/I5/330

表1 合金的化学成分

图1 合金热处理步骤的示意图

图2 GH2909合金在不同温度时效2000 h后的室温拉伸性能

图3 GH2909合金在不同温度时效2000 h后的高温(540℃)拉伸性能

图4 GH2909合金在不同温度时效2000 h后的微观组织

图5 GH2909合金在不同温度长期时效后的“黑晶”组织形貌

图6 GH2909合金在不同温度时效2000 h后组织中ε/ε″相的变化

图7 GH2909合金在不同温度时效2000 h后γ′相的变化

图8 黑晶组织的微观形貌

图9 GH2909合金不同温度时效2000 h后室温拉伸断口的形貌

图10 合金在650℃长期时效2000 h后室温拉伸断口的纵剖SEM形貌

图11 ε/ε″相周围的γ′相“贫化区”

图12 GH2909合金不同温度时效2000 h后高温拉伸微观断口的形貌

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