不同服役条件下<strong>FGH96</strong>合金的蠕变特征

doi:10.11900/0412.1961.2021.00207

金属学报

2022, Vol. 58

Issue (5): 673-682 DOI: 10.11900/0412.1961.2021.00207

研究论文

本期目录 | 过刊浏览

不同服役条件下FGH96合金的蠕变特征

彭子超¹(

), 刘培元², 王旭青¹, 罗学军¹, 刘健¹, 邹金文¹(

)

^1.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
^2.中国人民解放军陆军装备部航空军事代表局驻北京地区航空军事代表室北京 100012

Creep Behavior of FGH96 Superalloy at Different Service Conditions

PENG Zichao¹(

), LIU Peiyuan², WANG Xuqing¹, LUO Xuejun¹, LIU Jian¹, ZOU Jinwen¹(

)

^1.Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
^2.Aviation Military Representative Office of the PLA in Beijing, Beijing 100012, China

引用本文:

彭子超, 刘培元, 王旭青, 罗学军, 刘健, 邹金文. 不同服役条件下FGH96合金的蠕变特征[J]. 金属学报, 2022, 58(5): 673-682.
Zichao PENG, Peiyuan LIU, Xuqing WANG, Xuejun LUO, Jian LIU, Jinwen ZOU. Creep Behavior of FGH96 Superalloy at Different Service Conditions[J]. Acta Metall Sin, 2022, 58(5): 673-682.

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摘要:

采用SEM、EBSD和TEM等手段研究了FGH96合金在650~750℃、690~810 MPa条件下的蠕变特征,揭示FGH96合金在不同服役条件下的蠕变机理。结果表明,当蠕变温度为704℃时,FGH96合金的蠕变性能随着应力水平的提高而降低；当加载应力为690 MPa时,FGH96合金的蠕变性能随着温度提高而显著降低,且FGH96合金的稳态蠕变速率对服役温度更为敏感,服役温度每提高30℃,将会导致蠕变速率提高一个数量级。当温度处于650~750℃范围、应力处于690~810 MPa范围时,FGH96合金的蠕变变形均以位错滑移为主,且位错在滑移过程中,会在( $11 1 ¯$ )原子面上形成大量的微孪晶。在不同服役条件下,FGH96合金的蠕变断裂均呈现典型的沿晶断裂特征。

关键词 ： FGH96高温合金, 蠕变机理, 服役条件, 断裂特征

Abstract：

The FGH96 superalloy is extensively used as a gas turbine disk under high temperature due to its excellent tensile and creep properties. With recent developments in the aviation industry, the velocity of the aircraft has increased significantly, thereby increasing the temperature and stress on the turbine disk materials during their service. Therefore, creep deformation is crucial in the turbine disk superalloy. In this study, the creep characteristics of FGH96 superalloy were systematically studied at 650-750^oC and 690-810 MPa and the creep mechanism of the alloy under different service conditions was investigated via SEM, EBSD, and TEM. For the creep temperature of 704^oC, the creep properties of the alloy decreased with the increase in stress level. When the applied loading stress was 690 MPa, the creep properties of FGH96 alloy decreased significantly with the increase in temperature, and its steady-state creep strain rate was more sensitive to the service temperature. Further, every 30^oC increase in the service temperature increased the creep rate by an order of magnitude. For the temperature in the range 650-750^oC and the applied loading stress in the range 690-810 MPa, the creep deformation of the alloy was dominated by dislocation slip and resulted in various micro-twins on the continuous ( $11 1 ¯$ ) planes. Moreover, the creep fracture of FGH96 alloy presented typical intergranular fracture under different service conditions in this study.

Key words： FGH96 superalloy creep mechanism service condition fracture feature

收稿日期: 2021-05-17

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00207 或 https://www.ams.org.cn/CN/Y2022/V58/I5/673

图1 蠕变试样及其解剖分析图

表1 FGH96合金蠕变实验方案

图2 1160℃固溶处理的FGH96合金试样的显微组织及γ'相尺寸分布

图3 FGH96合金蠕变曲线

图4 FGH96合金稳态蠕变速率随温度和应力的变化关系

T / ^oC	$σ$ / MPa	$γ ˙$ / s^-1	T / ^oC	$σ$ / MPa	$γ ˙$ / s^-1
704	690	3.76 × 10^-9	650	690	4.19 × 10^-11
	720	7.82 × 10^-9	670		6.72 × 10^-10
	750	1.76 × 10^-8	704		3.76 × 10^-9
	780	2.74 × 10^-8	720		3.01 × 10^-8
	810	4.98 × 10^-8	750		1.24 × 10^-7

表2 不同条件下FGH96合金稳态蠕变速率

图5 704℃、不同加载应力条件下经过1.0%蠕变变形的FGH96合金局域取向差(KAM)和反极图(IPF)分析

图6 704℃、不同加载应力条件下经过1.0%蠕变变形的FGH96合金TEM像

图7 690 MPa应力、不同温度条件下经过1.0%蠕变变形的FGH96合金KAM和IPF分析

图8 FGH96合金在690 MPa、不同温度条件下蠕变后形成的微孪晶

图9 不同温度和应力条件下FGH96合金的蠕变断裂源区形貌

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