摘要
分别采用料浆法和粉末包埋法在K4104镍基高温合金上制备Al-Si和Al渗层。借助X射线衍射(XRD)和电子探针(EPMA),详细分析Al-Si、Al渗层的微观组织,探讨渗层形成机理,并且对比研究Al-Si共渗层和单渗Al层的微观结构,找出Si对渗Al层组织结构的影响。结果表明:Al-Si共渗渗层中包含CrxSiy化合物、富Al的β、富Ni的β、Cr的碳化物和γ′相,单渗Al层则包含富Al的β、富Ni的β、Cr的碳化物和γ′相;Si的加入使Al-Si共渗层出现过渡层,过渡层导致Al元素含量由外向内的减少趋势较单渗Al的平缓。
The Al-Si diffused and aluminized coatings were prepared on a nickel-based superalloy K4104 by slurry aluminizing and pack cementation, respectively. The microstructure of Al-Si coating and aluminized coating was analyzed by means of X-ray diffraction (XRD), electron probe microanalysis (EPMA), and the formation mechanism of Al-Si and aluminized coatings was also discussed. The microstructure of Al-Si coating was compared with that of aluminized coating in order to find out the effects of Si. The results show that the Al-Si coating consists of CrxSiy, Al-rich β, Ni-rich β, Cr-rich and γ'. The aluminized coating consists of Al-richβ, Ni-rich β, Cr-rich and γ'. Owing to the effect of Si, there is transition layer in Al-Si coating the declining trend of the aluminum concentration in the coating layer is smoother than that of the aluminized coating.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2006年第4期105-108,共4页
Transactions of Materials and Heat Treatment
关键词
镍基高温合金
Al-Si共渗
单渗Al
微观组织
Aluminum
Microanalysis
Microstructure
Nickel
Silicon
Superalloys
X ray diffraction