Casting and method for manufacturing casting
a manufacturing method and technology for casting materials, applied in the field of casting materials and casting methods, can solve problems such as insufficient density, and achieve the effects of high hardness, excellent wear resistance, and excellent corrosion resistan
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first embodiment
[0036]Hereinafter, a cast material of the first embodiment is described.
[0037]The cast material of the present embodiment is a Ni—B—Si three-element-based cast material which contains a eutectic part comprising a solid phase mainly composed of Ni and B and a solid phase mainly composed of Ni and Si, and is characterized in that when a straight line is drawn in a surface or a cross section of the eutectic part, the average number of interfaces formed between the solid phase mainly composed of Ni and B and the solid phase mainly composed of Ni and Si on the straight line is 2.0 / μm or more. When only one straight line is drawn in the surface or the cross section of the eutectic part, the term “average number of interfaces” means the number of interfaces per unit length (μm) of the straight line; when a plurality of straight lines is drawn in the surface or the cross section of the eutectic part, the average number of interfaces means the average of the numbers of interfaces per unit l...
second embodiment
[0070]Hereinafter, a cast material of the second embodiment is described.
[0071]The cast material of the present embodiment is a cast material comprising hard phase particles mainly composed of a boride and a binder phase containing an alloy containing Ni, Si, and B, wherein the average particle size of the hard phase particles is 3 μm or less, the average aspect ratio of the hard phase particles is 2.0 or less, the contact ratio between the hard phase particles is 35% or less, the binder phase contains Ni3Si and Ni3B, and the cast material has an intensity ratio IA / IB of 1 / 10 or less, where IA is the intensity of a peak derived from Ni31Si12 observed at a diffraction angle 2θ within the range of 46.8° to 47.8°, and IB is the intensity of a peak derived from Ni3Si observed at a diffraction angle 2θ within the range of from 44.0° to 45.0°, the intensities being determined by X-ray diffraction measurement using CuKα radiation.
[0072]The hard phase particles constituting the cast materia...
example 1
[0130]First, a Ni-based self-fluxing alloy (melting point: 985° C., composition: 0.02% by weight of C, 2.27% by weight of B, 7.03% by weight of Si, and 0.11% by weight of Fe, with the remainder being Ni) was prepared as a raw material powder. The raw material powder was then placed in a crucible, and was heated and hardened using a vacuum furnace at 1160° C. for 30 minutes to prepare an ingot. The ingot was melted by heating to 1200° C. in air using an air atmosphere furnace to prepare a raw material melt. The obtained raw material melt at 1200° C. was poured into a mold at room temperature, and was then air cooled to roam temperature. Thus, a cast material was obtained by air casting. In this process, when measured 2 minutes after being taking out from the furnace, the melt mixture had a temperature of 400° C. Namely, the melt mixture was cooled from 1200° C. to 400° C. in 2 minutes after being taken out from the air atmosphere furnace, and the cooling rate of the melt mixture was ...
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Abstract
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