Oxidation resistance of hot-dip aluminized coating on cast K438 superalloy

doi:10.13251/j.issn.0254-6051.2021.11.037

Abstract

Abstract: In view of the insufficient oxidation resistance of K438 nickel-based superalloy at high temperature, the aluminized coating was prepared on its surface by hot dip aluminizing technology. After vacuum diffusion annealing treatment at 1000 ℃ for 1 h, the high temperature cyclic oxidation tests at 1000 ℃ for 250 cycles were carried out on the superalloy with hot-dip aluminized coating. The cross-sectional microstructure of the coatings after high temperature oxidation was studied by means of scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD). The results show that the oxidation mass gain curve of the substrate alloy begins to decline after oxidation at 1000 ℃ for 40 cycles, and the oxidation resistance at high temperature is poor, and the oxidation products such as Al₂O₃, TiO₂, Cr₂O₃, NiO and spinel NiCr₂O₄, NiAl₂O₄ are formed after oxidation at 1000 ℃ for 250 cycles. However, the oxidation mass gain changes a little after oxidation at 1000 ℃ for 40 cycles, the Cr₂O₃ is not found in the oxidation products of hot-dip aluminized coatings after oxidation at 1000 ℃ for 250 cycles, and its high temperature oxidation resistance is significantly higher than that of the substrate alloy, among which the coating hot-dip aluminized for 90 s has better oxidation resistance at high temperature.

Key words: K438 superalloy, hot-dip aluminizing, protective coating, cyclic oxidation

CLC Number:

Deng Pengfei, Zuo Linchun, Chen Xingwei, Xiong Wei, Liu Yan, Liao Conglai, Li Zhi. Oxidation resistance of hot-dip aluminized coating on cast K438 superalloy[J]. Heat Treatment of Metals, 2021, 46(11): 207-212.

References

[1]Chen M H, Shen M L, Zhu S L, et al. Effect of sand blasting and glass matrix composite coating on oxidation resistance of a nickel-based superalloy at 1000 ℃[J]. Corrosion Science, 2013, 73(2): 331-341.
[2]Song P, Naumenko D, Vassen R, et al. Effect of oxygen content in NiCoCrAlY bondcoat on the lifetimes of EB-PVD and APS thermal barrier coatings[J]. Surface and Coatings Technology, 2013, 221(16): 207-213.
[3]Mishra S B, Chandea R, Prakash S. Characterisation and erosion behaviour of NiCrAlY coating produced by plasma spray method on two different Ni-based superalloys[J]. Materials Letters, 2008, 62(12): 1999-2002.
[4]Rajendran R. Gas turbine coatings-An overview[J]. Engineering Failure Analysis, 2012, 26: 355-369.
[5]Deshpande S, Sampath T S, Zhang H. Mechanisms of oxidation and its role in microstructural evolution of metallic thermal spray coatings case study for Ni-Al[J]. Surface and Coating Technology, 2006, 200(18/19): 5395-5406.
[6]Zhang Q. Developing tendency of the chemical vapor deposition technology[J]. Surface Technology, 1996, 25(2): 1-3.
[7]Hu T L, Huang H L, Gan D, et al. The microstructure of aluminized type 310 stainless steel[J]. Surface and Coating Technology, 2006, 201(6): 3502-3509.
[8]Awan G H, Hasan F U. The morphology of coating/substrate interface in hot-dip-aluminizes steels[J]. Material Science and Engineering A, 2008, 472(1/2): 157-165.
[9]Frutos E, Gonzalez-Carrasco J L, Jimenez J A, et al. Development of hard intermetallic coatings on austenitic stainless steel by hot dipping in an Al-Si alloy[J]. Surface and Coating Technology, 2009, 203: 2916-2920.
[10]Cheng W J, Liao Y J, Wang C J. Effect of nickel pre-plating on high-temperature oxidation behavior of hot-dipped aluminide mild steel[J]. Materials Characterization, 2013, 82: 58-65.
[11]Wang W, Li Z, Shen W J, et al. Phase equilibria of Zn-Al-Ti ternary system at 450 and 600 ℃[J]. Transactions of Nonferrous Metal Society of China, 2020, 30(4): 1005-1016.
[12]李智, 匡小围, 郑慧芸, 等. 一种热浸镀铝用新型助镀剂及其使用方法: 中国, 106148868A[P]. 2016-11-23.
[13]Wang F H, Lou H Y, Bai L X, et al. Hot corrosion of yttrium-modified aluminide coatings[J]. Material Science and Engineering A, 1989, 120: 387-389.
[14]Wallwork G R, Hed A Z. Some limiting factors in the use of alloys at high temperatures[J]. Oxidation of Metals, 1971, 3(2): 171-184.
[15]林盼盼. GH5188合金高温氧化性能研究[D]. 哈尔滨: 哈尔滨工业大学, 2012: 21.
[16]郭建亭. 高温合金材料学[M]. 北京: 科学出版社, 2008: 578.
[17]Young E W A, Dewt J H W. The use of an ¹⁸O tracer and Ruther-ford back scattering spectrometry to study the oxidation mechanism of NiAl[J]. Solid State Ionics, 1985, 16(1/4): 39-46.
[18]Golightly F A. The relationship between oxide grain morphology and growth mechanisms for Fe-Cr-Al and Fe-Cr-Al-Y alloys[J]. Journal of the Electrochemical Society, 1979, 126(6): 1035.
[19]Hindam H M, Smeltzer W W. Growth and microstructure α-A1₂O₃ on β-NiAl[J]. Journal of the Electrochemical Society, 1980, 127(7): 1630-1635.
[20]Jedliński J, Mrowec S. The influence of implanted yttrium on the oxidation behaviour of β-NiAl[J]. Materials Science and Engineering, 1987, 87: 281-287.
[21]郑运荣, 张德堂. 高温合金与钢的彩色金相研究[M]. 北京: 国防工业出版社, 1999: 189-192.
[22]贾志涛. K38合金热浸镀铝抗高温氧化性能的研究[D]. 哈尔滨: 哈尔滨工程大学, 2004.
[23]张忠礼. 含Al热喷涂涂层的高温表现与Al扩散机制[D]. 沈阳: 沈阳工业大学, 2007.
[24]施月杰. K4104镍基高温合金沉积MCrAlY涂层抗高温氧化性能研究[D]. 哈尔滨: 哈尔滨工程大学, 2011.
[25]彭新, 姜肃猛, 孙旭东, 等. 梯度NiCoCrAlYSi涂层的循环氧化及热腐蚀行为[J]. 金属学报, 2016, 52(5): 625-631.
Peng Xin, Jiang Sumeng, Sun Xudong, et al. Cyclic oxidation and hot corrosion behaviors of a gradient NiCoCrAlYSi coating[J]. Acta Metallurgica Sinica, 2016, 52(5): 625-631.