The relationship between hardness and wear of alloys in liquid nitrogen.
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The tests of rubbing wear against hardened 0.45%C-steel and 316-type austenitic stainless steel were carried out in liquid N2. Specimens used are (a) 20%Cr-(Fe, Co, Ni) solid solution alloys, (b) age-hardenable Nimonic 80A and Nimonic 100 alloys, and (c) low-Cr martensitic steels with and without carbide dispersion, whose martensite matrixes were controlled to have about 0.45% C. The rolling contact fatigue in liq. N2 of these low-Cr steels were also investigated. The results obtained are as follows.(1) The harder the solid solution is the fewer the wear-loss is. When the difference in hardness between the coupled specimens is large, the softer material adheres on the surface of the harder specimen, and then the coefficient of friction is very large.(2) Age-hardening increases the wear proof of the alloy.(3) The rubbing pair of matensitic steels is abrasively worn. The wear is suppressed by carbide dispersion, but the effect of the amount of carbide on wear is not so distinct. The rolling contact fatigue strength is increased by carbide dispersion.(4) It is considered roughly that the soft and ductile materials are adhesively worn, tough materials are worn by delamination process, and the hard and brittle materials are abrasively worn. However, multiple processes proceed simultaneously, and the contribution of each process changes with the wearing conditions. Therefore, the relation between hardness and wear is sometimes complicated.
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The Iron and Steel Institute of Japan | 論文
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