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Acta Metall Sin  2014, Vol. 50 Issue (1): 79-87    DOI: 10.3724/SP.J.1037.2013.00216
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HOT CORROSION RESISTANCE OF FILLER ALLOY BCo46
JING Yanhong, LIU Enze, ZHENG Zhi, TONG Jian, Ning Likui, HE Ping
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
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Abstract  

DZ468 alloy is a promising candidate in turbine blade serving in marine atmosphere because of its superior mechanical properties and good hot corrosion resistance. And brazing technology is indispensable to produce turbine blade because of its complicated hollow structure. Therefore, for accelerating the application of DZ468 superalloy, a new type Co-based filler named BCo46 was developed. Due to serving in marine atmosphere, the attack of hot corrosion can be inevitable. Frequently, the quality of turbine blade depends on the joining region, and the joining region has a lot to do with the filler used to braze the base alloy. Therefore, in this work, the hot corrosion behavior and mechanism of BCo46 alloy in the mixture of 75%Na2SO4 + 25%NaCl (mass fraction) at 900 ℃ was investigated, and compared with a common Ni-based filler BNi-2, and the base alloy DZ468. Moreover, the hot corrosion resistance of the joint bonded with BCo46 was evaluated. XRD, SEM, EDS and ICP spectrograph were employed to study the corrosion products of the tested alloys. The results show that the hot corrosion processes of BCo46, BNi-2 and DZ468 alloys are all accompanied with the dissolution of oxide scale and the formation of sulfide, which support the model of sulfidation-(acid-based) melting model. For filler alloy BCo46, Cr2O3, Co3BO5 and (Ni, Co)Cr2O4 mainly exist in the outer corrosion layer and some CrS is formed in the inner corrosion layer; the external corrosion products of BNi-2 are NiO, (Ni, Co)Cr2O4, Ni2FeBO5 and Cr2O3, and the internal precipitation is Ni2S3. The hot corrosion resistance of filler alloy BCo46 is superior to DZ468 superalloy and BNi-2 filler, it is because (1) BCo46 contains 22% Cr which can form dense and continuous oxide scale Cr2O3; (2) the diffusion rates of O and S are slower in Co- than Ni-based alloy; (3) Co can increase the adhesion of the oxide scale-base metal; (4) collaboration dissolution doesn't occur in BCo46. Furthermore, the formation of boride can deteriorate the hot corrosion resistance of alloy by forming oxides of boron which can dissolve oxide scale, consume Cr and increase phase interfacial area to accelerate the diffusion of S and O. The joint after heat treatment can reach the level of the hot corrosion resistance of the base metal DZ468.

Key words:  BCo46      DZ468      hot corrosion      filler     
Received:  25 April 2013     
ZTFLH:  TG146  
Corresponding Authors:  LIU Enze, associate professor, Tel: (024)23971143, E-mail: nzliu@imr.ac.cn   

Cite this article: 

JING Yanhong,LIU Enze,ZHENG Zhi,TONG Jian,Ning Likui,HE Ping. HOT CORROSION RESISTANCE OF FILLER ALLOY BCo46. Acta Metall Sin, 2014, 50(1): 79-87.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00216     OR     https://www.ams.org.cn/EN/Y2014/V50/I1/79

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