| 电弧熔炼Nb-Ti-Cr-Si基超高温合金的组织和室温力学性能 |
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| 引用本文： | 郭宝会,郭喜平.电弧熔炼Nb-Ti-Cr-Si基超高温合金的组织和室温力学性能[J].稀有金属材料与工程,2013,42(7):1387-1392. |
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| 作者姓名： | 郭宝会 郭喜平 |
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| 作者单位： | 西北工业大学凝固技术国家重点实验室,陕西西安,710072 |
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| 基金项目： | 国家自然科学基金资助（51071124）；高等学校博士点基金项目（20096102110012）；陕西省科学计划项目（2012JM6019） |
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| 摘 要： | 采用真空自耗电弧熔炼法制备了Nb-Ti-Cr-Si基超高温合金合金锭,测试了其室温力学性能。结果表明:合金锭各位置处的成分除Cr元素外分布比较均匀,Cr元素从锭边缘到中心部分呈现减少的趋势。合金的显微组织主要由初生Nbss,呈片层状或花瓣状的Nbss/(Nb,X)5Si3共晶组织及细小的Nbss/Cr2Nb共晶团组成,但在合金锭顶部中央处还出现了少量的块状(Nb,X)3Si。随着离锭边缘距离的增加,初生Nbss枝晶杆由细变粗,Nbss/(Nb,X)5Si3共晶组织的定向效果逐渐消失,但Nbss/Cr2Nb共晶团体积分数有减小的趋势。经过多元合金化的Nb-Ti-Cr-Si基合金室温的抗拉强度为378.7MPa,室温断裂韧性为13.4MPa·m1/2。室温拉伸和断裂韧性试样的失效模式均为脆性准解理断裂。
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| 关 键 词： | Nb-Ti-Cr-Si基超高温合金 显微组织 相组成 室温力学性能 |
| 收稿时间： | 2012/7/23 0:00:00 |
Microstructure and Ambient Mechanical Properties of Nb-Ti-Cr-Si Based Ultrahigh Temperature Alloy by Consumable Arc Melting |
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| Guo Baohui and Guo Xiping.Microstructure and Ambient Mechanical Properties of Nb-Ti-Cr-Si Based Ultrahigh Temperature Alloy by Consumable Arc Melting[J].Rare Metal Materials and Engineering,2013,42(7):1387-1392. |
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| Authors: | Guo Baohui and Guo Xiping |
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| Affiliation: | (State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China) |
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| Abstract: | The ingot of Nb-Ti-Cr-Si based ultrahigh temperature alloy was prepared by vacuum consumable arc melting, and the ambient mechanical properties of the alloy were measured. The results show that the chemical components are distributed uniformly at differen |
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| Keywords: | Nb-Ti-Cr-Si based ultrahigh temperature alloy microstructure phase constituent ambient mechanical properties |
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