Preparation process for nanoparticle reinforced die steel

Abstract

The invention discloses a preparation process for nanoparticle reinforced die steel. The process comprises the following steps of: performing pre-dispersion mixing on in-situ synthesized TiNC / Si3N4 nano mixed powder and pre-dispersion iron powder, preparing a dispersed precast block, adding the precast block into a steel ladle, synthesizing the precast block into TiNC / Si3N4 / Al2O3 mixed nanoparticles in molten steel in situ by using the high-temperature molten steel, uniformly dispersing the TiNC / Si3N4 / Al2O3 nanoparticle mixed powder in a die steel matrix by using an electromagnetic agitator and forming the die steel by adopting a casting method. By the preparation process, the in-situ synthesized nanoparticles are adopted, so the wettability of the nanoparticles and the matrix is improved; and the die steel with uniformly distributed nanoparticles is obtained by secondary dispersion and electromagnetic agitating processes, so the die steel is modified and reinforced. The volume fraction of the nanoparticles is regulated by regulating the addition of the nanoparticles, so the requirements of different working conditions can be met. The nano modified die steel with high abrasive resistance has high mechanical properties, and is simple in preparation and low in preparation cost.

Description

technical field [0001] The invention belongs to the technical field of die steel, and relates to a preparation method of nano powder reinforced die steel, in particular to a preparation process of nano particle reinforced die steel. Background technique [0002] With the development of modern mechanical equipment and manufacturing technology, higher and more stringent performance requirements are put forward for the performance and quality of parts. Traditional die steel materials are made by adding a certain amount of alloy elements into molten steel , so that a certain amount of primary carbides are formed during the solidification process, and a certain amount of secondary carbides are precipitated by heat treatment, so that the material can achieve wear resistance on the basis of maintaining a certain toughness. However, due to the limitation of the manufacturing process, the total amount of carbides is generally less than 20%. Due to the relatively small content of carb...

AI Technical Summary

Problems solved by technology

In situ synthesis technology can overcome the problems of poor wetting between the matrix and the second phase or reinforcement, interface reaction to produce a brittle layer, uneven distribution of the second phase or reinforcement phase, etc., so it has great potential in the development of new metal matrix nanocomposites. potential, but the current research work is more focused on aluminum-based composites, and research on in-situ synthesis of iron-based composites is receiving more and more attention

Due to the high melting temperature of die steel, the difficulty of uniform dispersion technology in steel after nanoparticles are added to steel, etc., seriously restricts the development and application of metal matrix nanocomposites, resulting in some metal matrix nanocomposites developed at home and abroad. The preparation process of metal-based nanocomposites is still in the experimental stage, so that the current research on metal-based nanocomposites is still vacant, at least no products have been formed yet.