High-temperature solid particle erosion of Cr–Ni–Fe–C arc cladded coatings

• Published in: Wear 2020-11, Vol.460-461, p.203439, Article 203439
• Main Authors: Efremenko, B.V., Shimizu, K., Espallargаs, N., Efremenko, V.G., Kusumoto, K., Chabak, Yu.G., Belik, A.G., Chigarev, V.V., Zurnadzhy, V.I.
• Format: Article
• Language: English
• Subjects: Alloys; Arc weld cladding; Arc welding; Carbide; Carbides; Chipping; Coatings; Erosion mechanisms; Erosion rates; Eutectic alloys; Eutectics; Flakes (defects); Flux-cored strip; Graphite; High temperature; High-temperature solid particle erosion; Inclusions; Matrix; Nickel; Oxidation; Spalling; Thickness; Wear mechanism; Welded joints
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2020.203439

In the present work two arc weld cladded alloys A (C3Cr25Ni3Si3) and B (C5Cr40Ni40Si2BZr) were tested under solid particle erosion at higher temperature (500 °C and 800 °C). The alloys were cladded using flux-cored strips PL-AN-101 and PL-AN-111, respectively. Alloy A is hypo-eutectic with a γFe + carbide M7C3 eutectic and austenite matrix. Alloy B is hyper-eutectic comprising coarse columnar M7C3 carbide, graphite flakes and an inhomogeneous austenitic matrix. It was found that alloy A presented a lower erosion rate of 18–41% at 500 °C due to the energy-consuming mechanisms of erosion (ploughing and poly-deformation). Alloy B was eroded by a low-cycle mechanism of carbide cracking/chipping. By increasing the testing temperature to 800 °C, the erosion rate of the alloys increased by 4.2–6.7 times. The erosion mechanism of the alloys at 800 °C was the formation and abrupt spalling of a depressed defective subsurface layer consisting of carbide fragments. Alloy A performed with a lower erosion rate of 39–44% at 800 °C due to a lower thickness of the defective layer. Oxidation had a negligible effect on the erosion rate of any of the alloys. The erosion rate of the coatings decreased with the distance from the coating top due to refinement of the carbide M7C3 and graphite inclusions. [Display omitted] •Cladded alloys C3Cr25Ni3Si3 and C5Cr40Ni40Si2BZr were erosion tested at 500 °C and 800 °C.•With the temperature increase, the erosion rate increased by 4.2–6.7 times for both alloys.•C3Cr25Ni3Si3 showed a better erosion resistance over C5Cr40Ni40Si2BZr.•Primary carbides and graphite flakes in C5Cr40Ni40Si2BZr facilitated the surface erosion.