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Surface or local gradient reinforced wear resistant manganese steel composite material and preparing process

A composite material, local gradient technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of small increase in hardness, waste of energy, increase in viscosity of molten steel, etc. Contradictions of hardness, saving precious alloy resources, and improving work hardening ability

Inactive Publication Date: 2005-05-18
JILIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

But at the same time, it also brings some difficult problems: because it is added in the smelting process, the burning loss of Ti is serious, the melt viscosity is high, the fluidity is poor, and it is extremely difficult to fill the mold. Therefore, it is necessary to increase the melting temperature, which not only wastes energy but also further increases Ti. Burnout
The generated TiC grows for a long time and has coarse particles, which affects the strengthening effect and reduces the material performance; it can only be compounded as a whole, the cost is high, and the toughness reserve is insufficient, so it is difficult to realize engineering application in the near future
For example, in recent years, someone has introduced a certain amount of (Fe.Mn.Cr) into austenitic manganese steel. 3 C or TiC particle reinforcement phase, made of particle reinforced steel matrix composites, but the effect is not good
When the volume fraction of the reinforcement phase is low, the hardness increases little, and the soft austenite is not enough to support the hard TiC, so the wear resistance does not improve much; when the volume fraction of the reinforcement phase is high, the hardness increases, but the toughness is lost Seriously, the safety of use cannot be guaranteed; and due to the introduction of the reinforcing phase, the process is complicated, the viscosity of molten steel is greatly increased, the fluidity is extremely poor, and the number of defects increases, making it difficult to cast

Method used

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  • Surface or local gradient reinforced wear resistant manganese steel composite material and preparing process

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of locally strengthened hammerheads for hammer crushers

[0029] The wear of the hammer head mainly occurs at the end, so the end is locally strengthened. Its process steps are as follows:

[0030] 1) Production of cast infiltration layer prefabricated body: high-carbon ferrochrome (60% Cr+6%C+Fe by weight) and ferro-titanium (60% Ti+40% Fe by weight) are mechanically crushed, screened and taken 100-200 mesh particles, mixed evenly with 70% titanium ferro+30% carbon ferrochrome according to the weight percentage, add a small amount of borax and phenolic resin to make a prefabricated block with a thickness of 10mm, the size is equivalent to the size of the end of the hammer head, put it on the water glass quartz At the end of the cavity of the sand mold, there are many pores in the mold to strengthen the exhaust;

[0031] 2) Smelting and pouring: Use scrap steel, ferromanganese, pig iron, etc. to prepare a furnace charge with a carbon content of 0.8% and a ...

Embodiment 2

[0042] Preparation of Blow Bar for Surface Strengthening of Impact Crusher

[0043] The wear of the blow bar mainly occurs on the bottom surface, so the surface layer is strengthened on the bottom layer. The raw materials used are the same as those in Example 1. The infiltration layer is still composed of 70% ferro-titanium + 30% carbon-chromium ferrochrome, and the crushing particle size is about 60-200 mesh. It is molded with water glass quartz sand, and the bottom of the mold is connected with the vacuum pumping box. After setting the core, spread the mixed powder dried at 120°C evenly and loosely on the bottom of the cavity with a thickness of about 10mm. It is still smelted by induction furnace without oxidation. The weight percentage of the designed components is: 1%C, 9%Mn, and the pouring temperature is 1580-1600°C. The in-situ reaction vacuum casting and infiltration synthesis casting method is adopted, and the vacuum degree is about 0.02-0.05MPa.

[0044] After th...

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Abstract

The present invention relates to surface or locally gradient reinforced antiwear composite manganese steel material and its preparation process. The composite material has matrix of austenite with relatively high toughness; reinforcing layer comprising TiC with relatively high hardness, martensite and metastable austenite; and intermediate transition layer comprising gradient varying TiC, martensite and austenite. The preparation process includes the following steps: designing metastable austenite manganese steel matrix composition with C 0.8-1.3 wt% and Mn 6-13 wt%; setting Ti-Fe alloy powder as composite medium in special parts of the cast mold and casting high temperature manganese steel melt to obtain the surface or local TiC reinforcement plus metastable austenite as-cast structure; and liquid nitrogen deep cooling the surface or local to obtain phase changed gradient martensite layer. The present invention can raise comprehensive mechanical performance of manganese steel.

Description

technical field [0001] The invention relates to a composite material with austenitic high manganese steel as a matrix and a preparation process. Background technique [0002] Austenitic high manganese steel has been the most widely used important wear-resistant material for more than 120 years since it came out in 1882. It is characterized by good toughness but low original hardness, and it shows good wear resistance only when it is subjected to strong impact and the surface layer is hardened, so it is more suitable for use under strong impact conditions; while for most other working conditions In this case, it appears that the toughness is sufficient but the hardness is insufficient, and the initial wear is serious, especially in the medium and low impact abrasive wear conditions, which are not wear-resistant due to insufficient work hardening. There are still debates about the cause of work hardening of high manganese steel and the mechanism of wear resistance. The more r...

Claims

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Application Information

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IPC IPC(8): C23C12/00
Inventor 赵宇光任露泉秦庆东周伟赵玉谦姜启川
Owner JILIN UNIV
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