| 引用本文: | 刘冠旗,王春旭,刘少尊,厉勇,谭成文,刘志超.时效处理对NiW750高密度合金组织与性能的影响[J].材料科学与工艺,2019,27(2):36-43.DOI:10.11951/j.issn.1005-0299.20170434. |
| LIU Guanqi,WANG Chunxu,LIU Shaozun,LI Yong,TAN Chengwen,LIU Zhichao.Effect of aging treatment on microstructure and properties of a new high density alloy NiW750[J].Materials Science and Technology,2019,27(2):36-43.DOI:10.11951/j.issn.1005-0299.20170434. |
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| 摘要: |
| 基于面心立方结构及细小弥散强化相原理，本文设计了一种新型高密度合金NiW750.将NiW750合金经不同温度时效处理后，测试其准静态力学性能，并用分离式Hopkinson压杆实验(SHPB)测试材料在动态加载条件下的性能，利用SEM、TEM对微观组织进行观察，同时测试组织的显微硬度.结果表明：在650~900 ℃范围内，随着时效温度的升高，合金的强度先升高，而后降低，韧性变化则相反.在750 ℃时效后其性能具有最佳配合.在动态加载条件下，合金存在应变率硬化效应，材料发生协同变形，试样内部形成绝热剪切带; 而750 ℃时效后合金硬度升高，变形带周围应力更集中，在应变率为6 800 s-1下试样出现断裂. |
| 关键词: 高密度合金 面心立方 时效处理 力学性能 动态加载 绝热剪切带 |
| DOI：10.11951/j.issn.1005-0299.20170434 |
| 分类号:TG146.4 |
| 文献标识码:A |
| 基金项目:国家重点研发计划资助项目(2016YFB0300104). |
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| Effect of aging treatment on microstructure and properties of a new high density alloy NiW750 |
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LIU Guanqi1,WANG Chunxu1,LIU Shaozun1,LI Yong1,TAN Chengwen2,LIU Zhichao2
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(1. Special Steel Institute,Central Iron and Steel Research Institute,Beijing 100081,China;2. School of Material Science and Engineering , Beijing Institute of Technology , Beijing 100081, China ) [HJ2.1mm]
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| Abstract: |
| A new high density alloy NiW750 is developed in this study, which is based on faced-center cubic structure and strengthened by a fine and dispersed phase. After aging at different temperatures, the quasi-static mechanical property of the alloy was tested, and the material characteristics under dynamic loading were investigated using the split Hopkinson pressure bar (SHPB) test. SEM and TEM were used to observe their microstructures, and the hardness of the microstructure was also tested. The results showed that in the range of 650~ 900 ℃, with the increase of aging temperature, the strength of the alloy increased at first, and then decreased obviously, while the change of toughness was the opposite. The alloy had the best performance after aging at 750 ℃. Under the condition of dynamic loading, the alloy showed obvious strain rate hardening effect, and adiabatic shear bands were formed within the sample. Furthermore, the collaborative deformation was observed between the deformation bands and the matrix. The hardness of the alloy was also higher after aging at 750 ℃, and the stress in the deformation zone was more concentrated, which led to the adiabatic shear fracture at the strain rate of 6 800 s-1. |
| Key words: high density alloy faced-center cubic aging treatment mechanical properties dynamic loading adiabatic shear bands |
