Iron-based composite material reinforced by in-situ titanium carbide grains and preparing method thereof

An iron-based composite material and particle-reinforced technology, which is applied in the field of in-situ titanium carbide particle-reinforced iron-based composite material and its preparation, can solve the problems of reducing strength and plasticity, achieve improved uniformity, easy process realization, and avoid formation Effect

Active Publication Date: 2012-07-18
JIANGSU TANGCHEN AUTOMOBILE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the TiC particle distribution is not highly dispersed or even agglomerated, it will lead to severe micros

Method used

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  • Iron-based composite material reinforced by in-situ titanium carbide grains and preparing method thereof
  • Iron-based composite material reinforced by in-situ titanium carbide grains and preparing method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0018] Example 1

[0019] To prepare iron matrix composites reinforced with titanium carbide particles with a volume fraction of 0.5%. Using the mechanical alloying method, the iron powder, titanium powder and carbon powder in the ratio of 7:2:1 are put into the ball mushroom machine, ground in a neutral or reducing atmosphere for 6 hours, and fully mixed to form a composite powder , using conventional methods to melt and process ductile iron, add iron-titanium-carbon composite powder with a mass fraction of 1.5% of ductile iron with the inoculant during the secondary inoculation of ductile iron, keep the temperature for 5 minutes, and then pour the as-cast composite material. The as-stated composite was austenitized and heat-treated by austempering at a temperature of 380°C for 120 minutes.

[0020] figure 1 Scanning electron microscope photo of in-situ titanium carbide particles reinforced iron matrix composites. It can be seen from the figure that the obtained TiC part...

Example Embodiment

[0021] Example 2

[0022] To prepare iron matrix composites reinforced with titanium carbide particles with a volume fraction of 3%. Using the mechanical alloying method, the iron powder, titanium powder and carbon powder with a ratio of 5:4:1 are put into the ball mushroom machine, ground in a neutral or reducing atmosphere for 10h, and fully mixed to form a composite powder , using conventional methods to melt and process ductile iron, add iron-titanium-carbon composite powder with a mass fraction of 6.0% of ductile iron with the inoculant during the secondary inoculation process of ductile iron, keep it warm for 10 minutes, and then pour it to obtain as-cast composite materials. The as-state composite material was subjected to austempering heat treatment in the same process steps as in Example 1. The average size of the reinforcing particles in the prepared TiC particle-reinforced iron matrix composite material is about 80nm, and the distribution is uniform on the matrix...

Example Embodiment

[0023] Example 3

[0024] To prepare iron matrix composites reinforced with titanium carbide particles with a volume fraction of 1.5%. Using the mechanical alloying method, the iron powder, titanium powder and carbon powder in the ratio of 6:3:1 are put into the ball mushroom machine, ground in a neutral or reducing atmosphere for 8 hours, and fully mixed to form a composite powder , using conventional methods to melt and process ductile iron, add iron-titanium-carbon composite powder with a mass fraction of 3.5% ductile iron with the inoculant during the secondary inoculation of ductile iron, keep the temperature for 8 minutes, and then pour the as-cast composite material. The as-stated composites were austenitized and heat treated at 400°C for 60 minutes austempering. The average size of reinforcing particles in the prepared TiC particle reinforced iron matrix composite material is about 100nm, and the distribution is uniform on the matrix. The mechanical properties of th...

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Abstract

The invention discloses an iron-based composite material reinforced by in-situ titanium carbide grains and a preparing method thereof. The preparing method is characterized in that: high-strength high-toughness spheroidal graphite cast iron is used as a matrix, in-situ grown submicron titanium carbide grains are used as reinforcing grains, and the titanium carbide grains are uniformly distributedon the spheroidal graphite cast iron matrix to obtain a high-strength high-toughness iron-based composite material; and iron powder, titanium powder and carbon powder are fully mixed by utilizing a mechanical alloying method to form composite powder, spheroidal graphite cast iron is molten and treated by a conventional method, the composite powder is added to molten iron during secondary inoculation in proportion, constant temperature is kept for 5-10min and casting is carried out to obtain a cast-state composite material, and the cast-state composite material is subjected to isothermal quenching heat treatment to obtain the iron-based composite material. According to the iron-based composite material prepared by the method disclosed by the invention, the in-situ titanium carbide grains are small in size and uniformly distributed on the matrix so as to ensure the characteristics of high strength and high toughness of the iron-based composite material.

Description

technical field [0001] The invention relates to an iron-based composite material and a preparation method thereof, in particular to an in-situ titanium carbide particle reinforced iron-based composite material and a preparation method thereof. Background technique [0002] By adding high-strength and high-hardness ceramic reinforcement particles to iron-based materials, iron-based composite materials can be obtained, which effectively improves the strength of iron-based materials, and has been widely used in service conditions such as heat resistance and wear resistance. According to the source of particle reinforcement, iron-based composites can be divided into external particle-reinforced iron-based composites and in-situ particle-reinforced iron-based composites. Since the reinforced particles generated in situ are often thermodynamically stable phases directly generated from the metal matrix through chemical reactions, the interface between the reinforced particles and t...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C33/08B22D19/14C21D1/20C21D5/00
Inventor 陈刚毛永锋赵玉涛朱劲松张松利
Owner JIANGSU TANGCHEN AUTOMOBILE PARTS
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