| 两种镍基合金喷焊层的相分布与热疲劳性能 |
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| 引用本文： | 王戬,田文怀,刘小萍.两种镍基合金喷焊层的相分布与热疲劳性能[J].北京科技大学学报,2008,30(11). |
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| 作者姓名： | 王戬 田文怀 刘小萍 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083
2. 北京科技大学材料科学与工程学院,北京,100083;太原理工大学表面工程研究所,太原,030024 |
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| 基金项目： | 国家自然科学基金
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| 摘 要： | 利用扫描电子显微镜、X射线衍射仪及透射电子显微镜观察分析了含Cu和Mo(Ni-A)、不含Cu和Mo(Ni-B)两种镍基合金喷焊层样品的组织、相分布和成分分布,分别测定了基体部位、热影响区、结合区及涂层内的显微硬度. 利用高频加热炉对两种喷焊层进行了热疲劳实验,对经热疲劳实验后喷焊层微观组织进行了观察,分析了喷焊层内的相分布和成分分布状态,探讨了热疲劳裂纹产生和扩展的过程及规律. 结果表明:两种喷焊层内均有针状富Cr第二相弥散分布,具有较好的热疲劳性能. Ni-A样品喷焊层可以分成两个区域:在靠近基体的区域均匀地分布着块状富Cr第二相;在离表层200μm左右的区域内分布有针状富Cr第二相,体积比块状富Cr第二相小几十倍. Ni-B样品喷焊层内只有针状富Cr第二相,在整个喷焊层内均匀分布. Ni-A样品喷焊层由于过渡区域的存在,具有比Ni-B样品喷焊层更好的热疲劳性能. 热疲劳实验前后样品的EDS分析结果表明两种喷焊层内的各相有较好的热稳定性.
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| 关 键 词： | 镍基合金喷焊层 弥散强化 显微组织 热疲劳 热裂纹 |
Phase distribution and thermal fatigue property of two kinds of Ni-based alloy spray-welding coatings |
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| WANG Jian,TIAN Wenhuai,LIU Xiaoping.Phase distribution and thermal fatigue property of two kinds of Ni-based alloy spray-welding coatings[J].Journal of University of Science and Technology Beijing,2008,30(11). |
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| Authors: | WANG Jian TIAN Wenhuai LIU Xiaoping |
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| Affiliation: | WANG Jian1),TIAN Wenhuai1),LIU Xiaoping1,2)1) School of Materials Science , Engineering,University of Science , Technology Beijing,Beijing 100083,China 2) Research Institute of Surface Engineering,Taiyuan University of Technology,Taiyuan 030024,China |
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| Abstract: | SEM,TEM and X-ray diffraction methods were used to observe and analyze the microstructure,phase distribution and composition distribution of Cu and Mo-containing (Ni-A) and Cu and Mo-free (Ni-B) Ni-based alloy spray-welding coatings.The micro-Vickers hardness of the matrix and the heat-effected,combined and coating areas was measured.The thermal fatigue process was actualized by an induction heater to investigate the phase morphology and composition distribution and the phenomenon of thermal cracks appearin... |
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| Keywords: | Ni-based alloy spray-welding coating second phase consolidation microstructure thermal fatigue thermal crack |
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