高Ti/Al比镍基高温合金中Hf合金化影响η相析出的机理研究

批准号:
52001314
项目类别:
青年科学基金项目
资助金额:
24.0 万元
负责人:
欧美琼
依托单位:
学科分类:
金属结构材料与力学行为
结题年份:
2023
批准年份:
2020
项目状态:
已结题
项目参与者:
欧美琼
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中文摘要
高Ti/Al比镍基高温合金因其优异的高温强度和良好的塑性在航空发动机关键热端部件获得广泛应用,但高温下合金组织易失稳,从γ'、MC、晶界析出针状η相,恶化合金力学性能,制约了该类合金在高温下的长期使用。由于Hf有望提高γ'、MC热稳定性和晶界稳定性,本项目将Hf引入到高Ti/Al比K4750合金中,以期阻碍γ'、MC高温下释放Ti,并避免Ti向晶界偏聚,实现抑制γ'、MC相转变析出η相和晶界析出η相的目标。通过系统研究加入Hf后γ/γ'元素分配和MC特征(尺寸及数量等)的变化情况,阐明Hf与γ'、MC热稳定性的内在联系;深入研究元素晶界偏聚行为及其对晶界析出相的影响,获得Hf与合金中B之间存在的交互作用机理;在此基础上,澄清Hf影响γ'、MC相转变和η相沿晶析出的微观机理。项目研究结果可为抑制高Ti/Al比镍基高温合金中η相的析出提供一种新途径,同时为该类合金的可靠应用奠定理论基础。
英文摘要
Nickel based superalloys with high Ti/Al have been widely used in the key hot components of aeroengine due to their excellent high temperature strength and good plasticity. However, the precipitation of η phase at high temperatures always deteriorates the mechanical properties, which restricts their long time using. The η phase can be precipitated from γ' phase, MC carbide and grain boundaries (GBs). Owing to hafnium alloying may have the beneficial effect of improving the stability of γ' phase, MC carbide and GBs, it is introduced into a typical high Ti/Al nickel based superalloy K4750. Hafnium is expected to hinder the release of Ti element from γ' phase and MC carbide, while avoiding Ti enrichment at GBs, which will inhibit the precipitation of η phase. In this project, the elements distribution in γ/γ' phases and the characteristics of MC carbide in K4750 alloy containing hafnium will be investigated systematically. Then the relationship between hafnium and the stability of γ' phase and MC carbide will be established. Furthermore, GBs elements segregation behavior and GBs precipitates characteristics will be studied, and the interaction between hafnium and boron will be explored. Based on the above research and analysis, the influence mechanism of hafnium on η phase originating from γ' phase, MC carbide and GBs will be clarified as well. The results of this study not only provide a new way to reduce the precipitation of η phase in high Ti/Al nickel based superalloys, but also have an important reference value for the engineering application of these alloys.
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DOI:10.1016/j.jallcom.2022.165473
发表时间:2022-05
期刊:Journal of Alloys and Compounds
影响因子:6.2
作者:Meiqiong Ou;Yingche Ma;Kunlei Hou;Kui Liu
通讯作者:Meiqiong Ou;Yingche Ma;Kunlei Hou;Kui Liu
DOI:10.1016/j.jmst.2021.03.022
发表时间:2021-04
期刊:Journal of Materials Science & Technology
影响因子:10.9
作者:Meiqiong Ou;Yingche Ma;Kunlei Hou;Min Wang;Guangcai Ma;Kui Liu
通讯作者:Meiqiong Ou;Yingche Ma;Kunlei Hou;Min Wang;Guangcai Ma;Kui Liu
DOI:10.1007/s11665-022-07628-0
发表时间:2022-11
期刊:Journal of Materials Engineering and Performance
影响因子:2.3
作者:Xiaoxiao Li;Meiqiong Ou;Xun Yu;Xianchao Hao;Yingche Ma
通讯作者:Xiaoxiao Li;Meiqiong Ou;Xun Yu;Xianchao Hao;Yingche Ma
DOI:10.1016/j.msea.2021.141588
发表时间:2021-07
期刊:Materials Science and Engineering: A
影响因子:--
作者:Kunlei Hou;Meiqiong Ou;Min Wang;Xianchao Hao;Yingche Ma;Kui Liu
通讯作者:Kunlei Hou;Meiqiong Ou;Min Wang;Xianchao Hao;Yingche Ma;Kui Liu
DOI:10.1016/j.jallcom.2022.164187
发表时间:2022-02-15
期刊:JOURNAL OF ALLOYS AND COMPOUNDS
影响因子:6.2
作者:Hou, Kunlei;Wang, Min;Liu, Kui
通讯作者:Liu, Kui
国内基金
海外基金
