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Large roller repairing layer and preparation method thereof

A technology for repairing layers and rolls, applied in coatings, furnace types, manufacturing tools, etc., can solve problems such as cracks, peeling and inclusions, and low bonding strength of the repairing layer, and achieve simple and feasible preparation technology, improve overall hardness, The effect of improving the bonding strength

Active Publication Date: 2016-09-28
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surfacing repair technology is complicated, the productivity is low, the hardness is not high, and the repair layer is prone to defects such as cracks, peeling and inclusions.
The main limitations of thermal spray repair technology are the low bonding strength between the coating and the substrate, high porosity of the coating, large residual stress, poor toughness and processability
The thermal spray welding repair technology not only requires that the thermal expansion coefficient of the coating powder must match that of the base material, but also the heat-affected zone is relatively large during thermal spray welding, which easily leads to deformation of the base material
Laser cladding repair technology has good processing performance and stable effect on workpieces, but its cost is high and cladding efficiency is low, so it has little practical value for large-area repair of large rolls
[0005] So far, there is no satisfactory technology at home and abroad that can realize the remanufacturing repair of rolls with low cost, high efficiency and high performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, a scrap high-speed steel roll is used as a substrate, and a repair layer is prepared on the surface of the substrate. The preparation method of the repair layer is as follows:

[0028] Step 1, pretreatment of the roll surface: Carry out cylindrical cutting on the entire roll surface to remove the wear-resistant layer; then soak in acetone for 20 minutes to remove oil, and soak in 20% sulfuric acid solution for 10 minutes to remove rust; finally, the The roll is immersed in an aqueous solution consisting of palladium chloride 1g / L, sodium citrate 5g / L, and hydrochloric acid 50mL / L, and stirred at room temperature for 5 minutes to activate the surface.

[0029] Step 2, melting molten steel: heat and melt the scrap roll steel in an induction heating electric furnace, add 10% FeB and 15% Mo powder after the molten steel is melted, and stir evenly.

[0030] Step 3, roll casting: using a gantry lifting device to vertically immerse the roll in molten steel...

Embodiment 2

[0035] In this embodiment, a scrap high-speed steel roll is used as a substrate, and a repair layer is prepared on the surface of the substrate. The preparation method of the repair layer is as follows:

[0036] Step 1, roll surface pretreatment: Carry out cylindrical cutting on the entire surface of the roll to remove the wear-resistant layer; then soak in acetone for 20 minutes to remove oil, soak in 20% sulfuric acid solution for 10 minutes to remove rust; finally, put Immerse the roll in an aqueous solution consisting of palladium chloride 5g / L, sodium citrate 15g / L, and hydrochloric acid 150mL / L, and stir at room temperature for 10 minutes to activate the surface.

[0037] Step 2, melting molten steel: heat and melt the scrap roll steel in an induction heating electric furnace, add FeB with a mass fraction of 20% and Mo powder with a mass fraction of 30% after the molten steel is melted, and stir evenly.

[0038] Step 3, roll casting: using a gantry lifting device to ver...

Embodiment 3

[0043] In this embodiment, a scrap high-speed steel roll is used as a substrate, and a repair layer is prepared on the surface of the substrate. The preparation method of the repair layer is as follows:

[0044]Step 1, pretreatment of the roll surface: Carry out cylindrical cutting on the entire roll surface to remove the wear-resistant layer; then soak in acetone for 20 minutes to remove oil, and soak in 20% sulfuric acid solution for 10 minutes to remove rust; finally, the The roll is immersed in an aqueous solution consisting of palladium chloride 3g / L, sodium citrate 7g / L, and hydrochloric acid 100mL / L, and stirred at room temperature for 7 minutes to activate the surface.

[0045] Step 2, melting molten steel: heat and melt the scrap roll steel in an induction heating electric furnace, add FeB with a mass fraction of 15% and Mo powder with a mass fraction of 25% after the molten steel is melted, and stir evenly.

[0046] Step 3, roll casting: using a gantry lifting devic...

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Abstract

The invention discloses a large roller repairing layer and a preparation method thereof. The repairing layer is mainly made of a multi-phase metal ceramic material which comprises a Mo2FeB2 hard phase and an iron base bonding phase. A preparation process of the repairing layer comprises the following steps in sequence: first, pretreating the surface of the roller in advance; next, heating and melting waste roller steel, and adding 10-20% in mass fraction of FeB and 15-30% in mass fraction of Mo powder; then, immersing the roller subjected to surface pretreatment in the molten iron for casting; then, performing laser strengthening on the surface of the cast roller; and finally, performing fine grinding treatment on the strengthened surface of the roller. According to the preparation method disclosed by the invention, a ternary boride Mo2FeB2 is formed through an in-situ reaction between the surface of the roller and a casting solution, and then a eutectoid is formed between the ternary boride Mo2FeB2 and a matrix of the roller, so that the Mo2FeB2-based metal ceramic repairing layer being high in bonding strength and being similar to a thermal expansion coefficient of the matrix is obtained; and besides, the repairing layer is low in raw material cost, simple and feasible in preparation technology, and high in production efficiency, and can be used for repairing of the surface of the industrialized and large roller.

Description

technical field [0001] The invention belongs to the technical field of roll surface treatment, and in particular relates to a large roll repair layer and a preparation method thereof. Background technique [0002] my country is a big country in steel production and consumption, of which rolled products account for about 85% to 90%. Roll is an indispensable consumable part in the production of rolled steel products, and it is also an important factor affecting the cost and efficiency of rolled steel production. With the increase in steel production and the improvement of steel quality requirements in recent years, the strengthening of the rolling process, the increase in the rolling of difficult-to-deform metals and alloy steels, the service conditions of the rolls are becoming more and more harsh, and the consumption of the rolls has also increased significantly. . With the increase of roll service time, wear is inevitable. Once the roll surface wears out and fails, the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/04C23C2/36C23C2/28C21D1/09C21D9/38
CPCC21D1/09C21D9/38C21D2211/008C21D2221/10C23C2/04C23C2/28C23C2/36
Inventor 王章忠吕学鹏张保森巴志新毛向阳董强胜朱帅帅
Owner NANJING INST OF TECH
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