金屬並に合金の折れ口 Fracture の研究 : 第 3 報 鑄込み條件と折口との關係
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Cast metals and alloys show always the fractures of 3rd. type, that is, the fineness of fracture is equal to the fineness of dendrite and there is no relation between these finenesses and grain size. Now, in this paper the influences of casting conditions upon the fineness of fracture or dendrite were studied on gun metal, 10% Sn bronze and constantan. I. Gun metal Casting temperature Mould Fineness of fracture or dendrite Grain size High Metal Finest Coarse Low 〃 Fine Fine High Sand Coarse Coarse 2. 10% Sn Bronze With increasing solidifying time (the time spent in cooling from liquidus to solidus line) we have more and more coarse fracture and dendrite, while grain size does not change. With constant solidifying time, other casting conditions such as casting temperature, maximum melting temperature and cooling rate after complete solidification have no influence upon the fineness of fracture or dendrite. Grain size becomes fine in an ingot cast at low temperature. 3. Constantan With increasing chill effect (with decreasing solidifying time) the finenesses become more and more minute both for fracture and dendrite. The ingot cast in a sand mould has coarse fracture and dendrite. Grains are, on the contrary, large at chilled part and rather small in a sand cast ingot. Similar results were also obtained on 7 : 3 brass. In all ingots cast in various conditions, the finenesses of fractures were equal, even in numerical values, to the finenesses of dendrites, while grains were always more than ten times larger than them. The fineness (of fracture or dendrite) and grain size changed quite independently.
- 1934-02-25
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