軸受鋼の研究 (V) : 炭化物のオースデナイトへの固溶について

概要

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In this report the behavior of spherical carbide going into solution in austenite was studied quantitatively, and the behavior of hardness and fracture roughness in austenite was studied together with. The results obtained are summarized as follows ; 1) At each heating temperature, the hardness increases with the holding time. At 840℃ temperature, the hardness increases rapidly and is saturated after 1 hour, and at 860℃ temperature it is considerably high in mere 5 minutes of the holding time. 2) Between SKF and Japan-made ball bearing tubes the behaviour of the carbide in austenite is very different. The carbide solution of the former is saturated in 50∿60 minutes, and one of the latter in 30∿50 minutes at each heating temperature. In the former the intervals of saturated carbide contents at each heating temperature are equal, but not equal in the latter. Namely, in the latter the intervals of saturated carbide contents between 780∿800℃ and 840∿860℃ temperature are considerably wide, and these between 800℃, 820℃ and 840℃ temperature are narrow. 3) The fracture roughness don't always agree with the visual observations, and it is considered generally that the fracture roughness increases at the point from the sliding failure to the separate one.
社団法人日本鉄鋼協会の論文
1957-01-01