Abstract
A Fe-17Cr-38Mo-4C alloy powder was plasma sprayed by three processes: an 80 kW low-pressure plasma spray (LPPS), a 250 kW high-energy plasma spray (HPS), and a 40 kW conventional plasma spray (APS). The as-sprayed coating obtained by the LPPS process is composed of only amorphous phase. As-sprayed coatings obtained by the HPS and APS processes are a mixture of amorphous and crystalline phases. The three as-sprayed coatings exhibit a high hardness of 1000 to 1100 DPN. The amorphous phase in these coatings crystallizes at a high temperature of about 920 K. A very fine structure composed of hard ϰ-phase and carbides is formed after crystallization. The hardness of the coating obtained by LPPS reaches a maximum of 1450 DPN just after crystallization on tempering and retains a high hardness more than 1300 DPN after tempering at high temperatures of 1173 or 1273 K. The corrosion potential of the amorphous coating is the highest among the three coatings and higher than that of a SUS316L stainless steel coating. The anodic polarization measurements infer that the corrosion resistance of the amorphous coating is superior or comparable to SUS316L stainless steel coating in H2SO4 solution.
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A. Inoue and T. Masumoto, Crystallization Behavior of Amorphous High-Carbon Alloy Steels,Sci. Rep. Research Inst. Tohoku Univ., Vol A27, 1979, p 147–158
K. Kishitake, H. Era, and F. Otsubo, Enhancement of Hardness by Heat Treatment in Rapidly Solidified High-Carbon Iron Alloys,Scr. Met. Mater., Vol 24, 1990, p 1269–1273
H. Era, K. Kishitake, F. Otsubo, and E. Tanaka, A13-Type Phase Re- vealed in Rapidly Solidified High-Carbon Iron Alloy,Metall. Trans. A, Vol 22A, 1991, p 251–253
H. Era, K. Kishitake, and P. Li, Structure and Decomposition of A13- Type Phase in Rapidly Solidified High-Carbon Cr-Si Iron Alloy,Met- all. Trans. A, Vol 24A, 1993, p 751–756
T. Iwadachi, A. Inoue, T. Minemura, and T. Masumoto, Nonequilibrium Phases in Fe-X-C (X = Cr, Mo, W) Ternary Alloys Quenched Rapidly from Melts,J. Jpn. Inst. Met., Vol 44, 1980, p 245–254 (in Japanese)
A. Inoue, L. Arnberg, M. Oguchi, U. Backmark, and N. Bäckström, and T. Masumoto, Preparation of Fe-Cr-Mo-C Amorphous Powders and Microstructure and Mechanical Properties of their Hot-Pressed Prod- ucts,Mater. Sci. Eng., Vol 95, 1987, p 101–114
R.C. Ruhl and M. Cohen, Splat Quenching of Iron-Carbon Alloys,Trans. AIME, Vol 245, 1969, p 241–251
K. Kishitake, H. Era, F. Otsubo, and E. Tanaka, Nonequilibrium Austenite/ε-Phase Eutectic Revealed in Rapidly Solidified High-Car- bon Iron Alloy,Metall. Trans. A, Vol 22A, 1991, p 791–792
T. Minemura, A. Inoue, and T. Masumoto, Metastable Austenite Phase in Rapidly Quenched Fe-Cr-C Alloys,Trans. ISIJ, Vol 21, 1981, p 649- 655
T. Minemura, A. Inoue, Y. Kojima, and T. Masumoto, Microstructure and Mechanical Properties of Nonequilibrium Austenite in Fe-C- (Mo, W) Systems Rapidly Quenched from Melts,Trans. ISIJ, Vol 22, 1982, p 934–941
K. Kishitake, H. Era, and F. Otsubo, Structures and Tempering Behav- ior of Rapidly Solidified High-Carbon Iron Alloys,Metall. Trans. A, Vol 22A, 1991, p 775–782
K. Kishitake, H. Era, F. Otsubo, P. Li, and N. Wakayama, Tempering Behavior of Rapidly Solidified Eutectic High-Carbon Fe-Cr-Mo-B Al- loys,J. Jpn. Foundry. Soc., Vol 65, 1993, p 468–473 (in Japanese)
H. Matsumoto, K. Kishitake, T. Irisawa, and H. Era, Characteristics of Rapidly Solidified Coatings Obtained by Thermal Spraying of White Cast Irons,J. Jpn. Foundry. Soc., Vol 62, 1990, p 37–42 (in Japanese)
K. Kishitake, H. Matsumoto, H. Era, and T. Irisawa, Characteristics of Rapidly Solidified Coatings Obtained by Thermal Spraying of White Cast Irons Containing Carbide Former Elements,J. Jpn. Foundry. Soc., Vol 62, 1990, p 185–190(in Japanese)
K. Kishitake, H. Era, and F. Otsubo, Formation and Properties of Iron Base Amorphous Coatings by Low Pressure Plasma Spraying,J. Jpn. Therm. Spray. Soc., Vol 32, 1994, p 15–21 (in Japanese)
H. Matsumoto and K. Kishitake, “Thermal Sprayed Coating of High- Carbon Iron Alloy,” Japanese patent 6-65747, 1994, (in Japanese)
A. Inoue, T. Masumoto, S. Arakawa, and T. Iwadachi, Amorphous High-Carbon Alloy Steels Rapidly Quenched from Melts,Mater. Trans. JIM, Vol 19, 1978, p 303–304
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Kishitake, K., Era, H. & Otsubo, F. Characterization of plasma sprayed Fe-17Cr-38Mo-4C amorphous coatings crystallizing at extremely high temperature. JTST 5, 283–288 (1996). https://doi.org/10.1007/BF02645879
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DOI: https://doi.org/10.1007/BF02645879