Casting infiltration method for enhancing hardness and abrasive resistance of surface layer of low-carbon alloy cast steel

A low-carbon alloy and surface layer technology, which is applied in the field of cast infiltration to enhance the hardness and wear resistance of the surface layer of low-carbon alloy cast steel

Inactive Publication Date: 2013-09-18
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional infiltration method usually needs to purchase expensive hard ceramic particles such as SiC, WC, TiC or Al2O3 as additives, which makes the cost of the infiltration method relatively low. At the same time, because the metallurgical reaction between some alloy powders or ceramic particles and the molten metal (mainly Fe) is not strong enough, the interface between the workpiece matrix and the infiltrated layer (surface layer) is not well bonded, resulting in the hardness and resistance of the surface layer. Grinding can not meet the requirements

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  • Casting infiltration method for enhancing hardness and abrasive resistance of surface layer of low-carbon alloy cast steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Mix iron powder and aluminum powder evenly according to the molar ratio of 1:1.5, on this basis, add tungsten concentrate powder accounting for 0.5% of the total mass of iron powder and aluminum powder, and mix the three powders evenly;

[0026] (2) According to the mass percentage, mix 65% of the above uniformly mixed powder with 35% of polyvinyl alcohol, and add water to prepare a paste coating;

[0027] (3) Apply the coating evenly on the inner wall of the mold, and then apply it for the second time after drying, and then dry it after coating for 3 times, pour the smelted Q295 low-carbon alloy cast steel liquid into the mold for casting, and wait until the casting is completed The casting is completely solidified and cooled, and the casting is removed from the mold.

[0028] After testing, the thickness of the alloy layer on the surface of the workpiece obtained by the cast infiltration method of this embodiment reaches 4mm, the surface hardness is 58HRC, the wea...

Embodiment 2

[0030] (1) Mix iron powder and aluminum powder evenly according to the molar ratio of 1:1.5, on this basis, add tungsten concentrate powder accounting for 1.5% of the total mass of iron powder and aluminum powder, and mix the three powders evenly;

[0031] (2) According to the mass percentage, mix 70% of the above uniformly mixed powder with 30% of polyvinyl alcohol, and add water to prepare a paste coating;

[0032] (3) Apply the coating evenly on the inner wall of the mold, and then apply it for the second time after drying, and then dry it after coating 4 times, pour the smelted Q345 low-carbon alloy cast steel liquid into the mold for casting, and wait until the casting is completely After solidification and cooling, the casting is removed from the mold.

[0033] After testing, the thickness of the alloy layer on the surface of the workpiece obtained by the casting infiltration method of this embodiment reaches 3.9mm, the surface hardness is 60HRC, the wear resistance is a...

Embodiment 3

[0035] (1) Mix iron powder and aluminum powder evenly according to the molar ratio of 1:1.5, on this basis, add tungsten concentrate powder accounting for 3% of the total mass of iron powder and aluminum powder, and mix the three powders evenly;

[0036] (2) According to the mass percentage, mix 80% of the above uniformly mixed powder with 20% of polyvinyl alcohol, and add water to prepare a paste coating;

[0037] (3) Apply the coating evenly on the inner wall of the mold, and then apply it for the second time after drying. After coating for 5 times, dry it, pour the melted Q390 low-carbon alloy cast steel liquid into the mold for casting, and wait until the casting is completed. After the casting has completely solidified and cooled, the casting is removed from the mold.

[0038] After testing, the thickness of the alloy layer on the surface of the workpiece obtained by the casting infiltration method of this embodiment reaches 3.95mm, the surface hardness is 63HRC, the wear...

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Abstract

The invention belongs to the technical field of material processing, in particular to a casting infiltration method for enhancing hardness and abrasive resistance of a surface layer of low-carbon alloy cast steel. The method comprises the steps of uniformly mixing iron powder and aluminum powder, adding tungsten concentrate powder, mixing with polyvinyl alcohol after uniformly mixing the iron powder, the aluminum powder and the tungsten concentrate powder, adding water to prepare pasty paint, coating an internal wall of a mold with the paint for 3-5 times, then drying, injecting smelted molten low-carbon alloy cast steel into the mold for casting, and when casting is finished, taking a casting out of the mold after the casting is solidified and cooled completely. According to the method, a series of chemical reactions occur during casting of the molten steel, a hard particle phase is generated, surface alloy of a low-carbon alloy cast steel workpiece exerts very good solution strengthening and pinning effects; hard particles and dislocation in a matrix have interaction to avoid dislocation movement, so that the yield strength and microhardness of the matrix are improved, the strengthening effect is significant, the thickness of an infiltration layer is great, and the binding property with the matrix is good.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a cast infiltration method for enhancing the hardness and wear resistance of the surface layer of low-carbon alloy cast steel. Background technique [0002] The failure of most parts occurs on the surface where the friction behavior occurs. Compared with the overall strengthening material, the surface strengthening material developed for the surface wear problem can reduce the cost and has high practical value. [0003] The surface strengthening of metal materials is an effective method to improve the performance of materials. At present, there are many methods for strengthening the metal surface, such as thermal spraying, ion implantation and surfacing welding. These methods can alloy the surface of castings, improve their hardness and wear resistance. sex. However, there are some problems to be solved in these methods. For example, the thermal spraying ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/08
Inventor 李刚王妍胡文全安亚君
Owner LIAONING TECHNICAL UNIVERSITY
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