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A Method for Reducing Shrinkage Cavity Depth of Ni-base Superalloy Ingot

A technology of nickel-based superalloy and shrinkage cavity, which is applied in the direction of casting mold, casting mold composition, casting molding equipment, etc., can solve the problems of prolonging the production cycle and increasing production cost, and achieve the reduction of shrinkage cavity depth, good feeding effect, Effect of improving surface finish

Active Publication Date: 2015-11-25
太原钢铁(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the insulation cap made of refractory material needs to be specially made and can only be used once. It needs to be combined and installed during use, which increases production costs and prolongs the production cycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Inconel690 nickel-based superalloy was smelted by vacuum induction at 500Kg.

[0020] First, 50% by mass of Al in the A formula 2 o 3 , 20% by mass of CaO, 30% by mass of MgO, mixed with water to form a suspension, the density of the suspension is 1500Kg / m 3, Dip it with a brush and apply it evenly on the inner surface of the mold; then apply B formula: 30% by mass of Al 2 o 3 , 20% by mass of CaO, 25% by mass of TiO 2 , 25% mass percentage of floating beads, mixed with water to form a suspension, the density of the suspension is 1100Kg / m 3 , Dip it with a brush and apply it evenly on the inner surface of the upper part of the mold with a cavity height of 300mm. Al in formula 2 o 3 , CaO, MgO and TiO 2 The particle size is 350 mesh. After the casting mold is baked at 200℃-4h, it is put into a vacuum furnace for use. The mold thickness is 25mm, and the mold cavity size is φ280×1000mm.

[0021] The surface quality of the nickel-base superalloy ingot poured by t...

Embodiment 2

[0023] Inconel718 nickel-based superalloy was smelted by vacuum induction at 500Kg.

[0024] First, the Al of 65% by mass percentage in the A formula 2 o 3 , 20% by mass of CaO, 15% by mass of MgO, mixed with water to form a suspension, the density of the suspension is 1600Kg / m 3, Dip it with a brush and apply it evenly on the inner surface of the mold; then apply B formula: 35% by mass of Al 2 o 3 , 25% by mass of CaO, 15% by mass of TiO 2 , 25% mass percentage of floating beads, mixed with water to form a suspension, the density of the suspension is 1200Kg / m 3 , Dip it with a brush and evenly brush it on the inner surface of the upper part of the mold with a cavity height of 250mm. Al in formula 2 o 3 , CaO, MgO and TiO 2 The particle size is 400 mesh. After the casting mold is baked at 250℃-3.5h, it is put into a vacuum furnace for use. The mold thickness is 25mm, and the mold cavity size is φ280×1000mm.

[0025] The surface quality of the nickel-base superalloy ...

Embodiment 3

[0027] Inconel625 nickel-based superalloy was smelted by vacuum induction at 500Kg.

[0028] First, 55% by mass of Al in the A formula 2 o 3 , 30% by mass of CaO, 15% by mass of MgO, mixed with water to form a suspension, the density of the suspension is 1300Kg / m 3, Dip it with a brush and apply it evenly on the inner surface of the mold; then apply B formula: 30% by mass of Al 2 o 3 , 25% by mass of CaO, 25% by mass of TiO 2 , 20% mass percentage of floating beads, mixed with water to form a suspension, the density of the suspension is 1300Kg / m 3 , Dip it with a brush and evenly brush it on the inner surface of the upper 200mm cavity height of the casting mold. Al in formula 2 o 3 , CaO, MgO and TiO 2 The particle size is 300 mesh. After the casting mold is baked at 300℃-3h, it is put into a vacuum furnace for use. The mold thickness is 30mm, and the mold cavity size is φ350×800mm.

[0029] The surface quality of the nickel-base superalloy ingot poured by this meth...

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Abstract

The invention discloses a method for reducing the depth of a nickel-based high-temperature alloy ingot shrinkage hole, belonging to the field of metallurgy. The method comprises the following steps: uniformly coating the inner surface of a casting mould with a first suspension solution during vacuum induction smelting of nickel-based high-temperature alloy; uniformly coating the inner surface at the 1 / 3-1 / 4 height of a cavity in the upper part of the casting mould with a second suspension solution; baking the casting mould subjected to be coated with the suspension solutions at 200-300 DEG C for 2-4 hours, and putting the baked casting mould into a vacuum furnace; controlling the particle sizes of Al2O3, CaO, MgO and TiO2 to be 200-500 meshes. A nickel-based high-temperature alloy ingot obtained by adopting the method is smooth in surface quality, shallow in shrinkage hole depth and free of secondary shrinkage hole; the yield is remarkably increased.

Description

technical field [0001] The invention relates to the field of metal material preparation, in particular to the problem of improving the quality of the shrinkage cavity depth of nickel-based superalloy material casting ingots. Background technique [0002] Nickel-based superalloys contain a large amount of Ni, Cr, Co, Mo, Nb and other expensive elements that are scarce in the country, and are usually produced by vacuum induction smelting + electroslag remelting or vacuum induction smelting + vacuum consumable. Before the subsequent processing of the nickel-based superalloy induction ingot, the riser must be removed to remove defects such as surface scars, so as to ensure the overall metallurgical quality and processing performance. [0003] At present, the vacuum induction smelting of nickel-based superalloys generally adopts the mold casting method, and the mold material is cast iron or cast steel. There are mainly two pouring methods: one is that the metal melt is directly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C19/03B22C3/00
Inventor 王岩曾莉李莎李阳李华英车德会
Owner 太原钢铁(集团)有限公司
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