Cr_3C_2-20%NiCr溶射皮膜の強度に及ぼす熱処理の影響

概要

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The effect of heat treatment on the strength of Cr_3C_2-20%NiCr coatings sprayed on 13%Cr-5% Ni steel by high-velocity oxygen fuel (HVOF) spraying has been studied. Specimens were heated to 823 K and held for 1,5,and 15 h. The strength and hardness of Cr_3C_2 20%NiCr-sprayed coatings were measured by a tensile test and a micro-Vickers hardness test. The results obtained were as follows. (1) Heat treatment increased the strength and hardness of the Cr_3C_2-20%NiCr-sprayed coatings. (2) The treatment decreased the maximum peeling area on the 13%Cr-5%Ni steel base under the cracks produced in tensile tests. (3) The mechanism of the strengthening of Cr_3C_2-20% NiCr sprayed coatings by heat treatment is considered to be as follows. The heat treatment divides the blowhole cracks in the coatings into smaller subvoids and decreases the extension paths of steel base, thus strengthening the adhesion force and hardening the sprayed coating.
社団法人日本機械学会の論文
1997-08-25