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| Ru对镍基单晶热暴露组织演变及持久性能的影响 | |
| 引用本文： | 陈晶阳,胡聘聘,冯 强,曹腊梅,孙祖庆.Ru对镍基单晶热暴露组织演变及持久性能的影响[J].稀有金属材料与工程,2011,40(12):2111-2116. |
| 作者姓名： | 陈晶阳 胡聘聘 冯 强 曹腊梅 孙祖庆 |
| 作者单位： | 1. 北京科技大学新金属材料国家重点实验室,北京100083;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. 北京科技大学新金属材料国家重点实验室,北京100083;北京科技大学国家材料服役安全科学中心,北京100083 3. 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 4. 北京科技大学新金属材料国家重点实验室,北京,100083 |
| 基金项目： | 国家高技术研究发展计划（2007AA03A225）；国家自然科学基金（50671015）；国家重点基础研究发展计划（2010CB631201）和教育部“新世纪优秀人才支持计划”（NCET-06-0079）资助 |
| 摘 要： | 对比研究了不含Ru的USTB-F7及添加2.5 wt％ Ru的USTB-F8两种镍基单晶高温合金的组织稳定性和持久性能.标准热处理与1100℃长期热暴露组织研究表明:合金USTB-F7中γ′相形貌介于球形和立方形之间,属中间态形貌；热暴露2000 h后,其形貌仍保持稳定,仅发生粗化而未发生筏排化.Ru的添加使Re元素在γ/γ′中的分配比增大,提高了合金USTB-F8的γ/γ′点阵错配度和γ'相的立方度,从而加速了长期热暴露过程中的筏排化进程,经2000 h热暴露发生了明显的筏排化现象.同时,合金USTB-F7热暴露700 h后在枝晶干处析出了富集Re、W和Cr元素的TCP相,Ru的加入有效地抑制了TCP相的析出,合金USTB-F8直至2000 h仍未析出TCP相.1100℃/140MPa持久性能测试表明,Ru显著提高合金的持久寿命,这与Ru增加合金中的y相体积分数和γ/γ′点阵错配度,促进筏排组织的形成,并减小时效组织中的γ通道宽度有关. |
| 关 键 词： | 高温合金 Ru 错配度 组织稳定性 持久寿命 |
| 收稿时间： | 2010/12/18 0:00:00 |
Effects of Ru on Microstructural Evolution during Thermal Exposure and Stress-rupture Property of Ni-based Single Crystal Superalloys |
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| Chen Jingyang,Hu Pinpin,Feng Qiang,Cao Lamei and Sun Zuqing.Effects of Ru on Microstructural Evolution during Thermal Exposure and Stress-rupture Property of Ni-based Single Crystal Superalloys[J].Rare Metal Materials and Engineering,2011,40(12):2111-2116. | |
| Authors: | Chen Jingyang Hu Pinpin Feng Qiang Cao Lamei and Sun Zuqing |
| Affiliation: | State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China |
| Abstract: | The effects of Ru on the microstructural stability and stress-rupture property have been investigated for two experimental Ni-based single crystal superalloys with and without Ru (2.5 wt%) addition.The results of standard heat treatment and long-term thermal exposure at 1100℃ indicate that the intermediate γ’ precipitates in the dendrite cores of the Ru-free alloy do not change in morphology and only become coarsening after 2000 h thermal exposure.The Re partitioning ratio of γ/γ’ phases increases with the addition of Ru,thus resulting in more negative lattice misfit and more cuboidal γ’ precipitates.The Ru-containing alloy rafts after 2000 h thermal exposure.Meanwhile,TCP phases enriched in Re,W and Cr precipitate after 700 h thermal exposure in the dendrite cores of the Ru-free alloy while TCP phases are not observed even after 2000 h thermal exposure in the Ru-containing alloy.These results suggest that Ru addition suppresses the precipitation of TCP phases significantly.The investigation of stress-rupture properties at 1100℃ /140 MPa indicates that Ru addition increases the stress-rupture life of the baseline alloy (Ru-free) since Ru addition increases the γ’ volume fraction and decreases the width of γ channels after standard heat treatment,as well as increasing the γ/γ’ lattice misfit with a well rafting microstructure. |
| Keywords: | superalloys Ru lattice misfit microstructural stability stress-rupture life |
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