D0I:10.13374/i.issnl001153.2008.11.004 第30卷第11期 北京科技大学学报 Vol.30 No.11 2008年11月 Journal of University of Science and Technology Beijing Now.2008 两种镍基合金喷焊层的相分布与热疲劳性能 王 戬) 田文怀刘小萍1,2) 1)北京科技大学材料科学与工程学院，北京1000832)太原理工大学表面工程研究所，太原030024 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一A)、不含Cu和Mo(NiB)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C第二相弥散分布，具有较好的热 疲劳性能.Ni一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2O0m左右的 区域内分布有针状富Cr第二相，体积比块状富C第二相小几十倍.NiB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，N一A样品喷焊层由于过渡区域的存在，具有比NB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， 关键词镍基合金喷焊层：弥散强化：显微组织：热疲劳：热裂纹 分类号TG174.442 Phase distribution and thermal fatigue property of two kinds of Ni-based alloy spray-welding coatings WANG Jian,TIAN Wenhuai,LIU Xicoping) 1)School of Materials Science and Engineering.University of Science and Technology Beijing.Beijing 100083.China 2)Research Institute of Surface Engineering Taiyuan University of Technology,Taiyuan 030024.China 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 mi- cro-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 appearing and spreading.Experimental results show that there exists needle Cr-rich phase with excellent thermal fatigue prop- erty in both Ni-A and Ni-B coatings.Ni-A coating can be divided into two areas:one is round-shaped Crrich phase which distributes near the matrix uniformly and the other is needle"shaped Crrich phase which distributes near the surface with a distance of about 200 Pm away from the outer surface of the coating.The volume of the needle-shaped Cr-rich phase is smaller than that of the round- shaped Cr-rich phase by several ten times.Compared with Ni-A coating.Ni-B coating has only needle-shaped Cr rich phase distribut- ing in the spray coating uniformly.The thermal fatigue property of Ni-A coating is better than that of Ni-B because of a transition area in Ni-A coating.The results obtained by EDS analysis show that there is almost no diffusion of elements in Ni-A and Ni-B coat- ings during the thermal experiment and the two types of coatings have excellent thermal stability. KEY WORDS Ni-based alloy spray-welding coating:second phase consolidation:microstructure;thermal fatigue:thermal crack 含灰烟气对工业燃煤锅炉管道的冲蚀磨损非常 以有效地防护锅炉管道，延长锅炉的使用寿命]. 严重[]，丝材电弧喷涂与合金粉末热喷焊技术可 尤其是镍基合金的喷焊层，耐磨耐蚀性能优异，而且 收稿日期：2007-11-15修回日期：2008-01-14 基金项目：国家自然科学基金资助项目(N。-50671012) 作者简介：王戬(1975一），男，博士研究生：田文怀(l959一)，男，教授，博士生导师，Emal:wenhuaitian@hotmail.com两种镍基合金喷焊层的相分布与热疲劳性能 王 戬1） 田文怀1） 刘小萍1‚2） 1） 北京科技大学材料科学与工程学院‚北京100083 2） 太原理工大学表面工程研究所‚太原030024 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． 关键词 镍基合金喷焊层；弥散强化；显微组织；热疲劳；热裂纹 分类号 TG174∙442 Phase distribution and thermal fatigue property of two kinds of N-i based alloy spray-welding coatings W A NG Jian 1）‚TIA N Wenhuai 1）‚LIU Xiaoping 1‚2） 1） School of Materials Science and Engineering‚University of Science and Technology Beijing‚Beijing100083‚China 2） Research Institute of Surface Engineering‚Taiyuan University of Technology‚Taiyuan030024‚China ABSTRACT SEM‚T EM and X-ray diffraction methods were used to observe and analyze the microstructure‚phase distribution and composition distribution of Cu and Mo-containing （N-i A） and Cu and Mo-free （N-i B） N-i based alloy spray-welding coatings．T he mi￾cro-Vickers hardness of the matrix and the heat-effected‚combined and coating areas was measured．T he thermal fatigue process was actualized by an induction heater to investigate the phase morphology and composition distribution and the phenomenon of thermal cracks appearing and spreading．Experimental results show that there exists needle Cr-rich phase with excellent thermal fatigue prop￾erty in both N-i A and N-i B coatings．N-i A coating can be divided into two areas：one is round-shaped Cr-rich phase which distributes near the matrix uniformly and the other is needle-shaped Cr-rich phase which distributes near the surface with a distance of about200 μm away from the outer surface of the coating．T he volume of the needle-shaped Cr-rich phase is smaller than that of the round￾shaped Cr-rich phase by several ten times．Compared with N-i A coating‚N-i B coating has only needle-shaped Cr rich phase distribut￾ing in the spray coating uniformly．T he thermal fatigue property of N-i A coating is better than that of N-i B because of a transition area in N-i A coating．T he results obtained by EDS analysis show that there is almost no diffusion of elements in N-i A and N-i B coat￾ings during the thermal experiment and the two types of coatings have excellent thermal stability． KEY WORDS N-i based alloy spray-welding coating；second phase consolidation；microstructure；thermal fatigue；thermal crack 收稿日期：2007-11-15 修回日期：2008-01-14 基金项目：国家自然科学基金资助项目（No．50671012） 作者简介：王 戬（1975－）‚男‚博士研究生；田文怀（1959－）‚男‚教授‚博士生导师‚E-mail：wenhuaitian＠hotmail．com 含灰烟气对工业燃煤锅炉管道的冲蚀磨损非常 严重［1－2］‚丝材电弧喷涂与合金粉末热喷焊技术可 以有效地防护锅炉管道‚延长锅炉的使用寿命［3］． 尤其是镍基合金的喷焊层‚耐磨耐蚀性能优异‚而且 第30卷 第11期 2008年 11月 北 京 科 技 大 学 学 报 Journal of University of Science and Technology Beijing Vol．30No．11 Nov．2008 DOI:10．13374／j．issn1001－053x．2008．11．004