High-titanium-carbide steel bond hard alloy mold material

A steel-bonded hard alloy and mold material technology, which is applied in the field of mold material preparation for powder metallurgy products, can solve problems such as high brittleness, high porosity, and low strength, and achieve improved hardenability, improved grain boundary bonding force, The effect of improving the bonding strength

Active Publication Date: 2015-02-11
LAIWU JINWEI NEW MATERIALS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to aim at the technical problems of high porosity, high brittleness and low strength in the preparation of high-carbon titanium steel-bonded hard alloys. The alloy design of the base binder phase, optimizing the formula of trace alloy elements V, B and rare earth elements, improves the wettability of titanium carbide and iron base binder phase, inhibits the growth of titanium carbide grains during the sintering process, and reduces the porosity of the sintered body , improving the bonding strength between the iron-based binder phase and titanium carbide, and developing a high-performance titanium carbide steel-bonded cemented carbide material and its preparation method

Method used

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Effect test

Embodiment 1

[0020] 55.0% by weight of titanium carbide, 45% of the iron-based binder phase according to the requirements of the ingredients, the composition of the iron-based binder phase is C: 0.55%, Cr: 3.5%, Mn: 0.9%, Mo: 3.0%, Ni : 3.4%, Cu: 0.80%, the balance of Fe, where Fe consists of 80% reduced iron powder and 20% carbonyl iron powder. The bearing steel ball is used as the grinding body, the ball-to-material ratio is 4:1, the material is unloaded after wet grinding for 36 hours, vacuum-dried, then pressed into shape with a cold isostatic press, vacuum sintered at 1420°C for 1 hour, and finally kept at 1050°C for 1 hour Air cooling after 1 hour to obtain the required TiC steel-bonded hard alloy material. Its metallographic diagram see figure 1 , the properties are shown in Table 1.

Embodiment 2

[0022] 55.0% by weight of titanium carbide, 45% of the iron-based binder phase according to the requirements of the ingredients, the composition of the iron-based binder phase is C: 0.55%, Cr: 3.5%, Mn: 0.9%, Mo: 3.0%, Ni : 3.4%, Cu: 0.80%, alloy additives: 0.63%, the balance of Fe, wherein the alloy additives are composed of 0.01% B, 0.25% V and 0.27% rare earth, the rare earth is composed of La, Ce, Nd, E and Y, Fe It is composed of 80% reduced iron powder and 20% carbonyl iron powder. The bearing steel ball is used as the grinding body, the ball-to-material ratio is 4:1, the material is unloaded after wet grinding for 36 hours, vacuum-dried, then pressed into shape with a cold isostatic press, vacuum sintered at 1420°C for 1 hour, and finally kept at 1050°C for 1 hour Air cooling after 1 hour to obtain the required TiC steel-bonded hard alloy material. Its metallographic diagram see figure 2 , the properties are shown in Table 1.

Embodiment 3

[0024] 65.0% by weight of titanium carbide, 35% of the iron-based binder phase ingredients according to the requirements, the composition of the iron-based binder phase is C: 0.4%, Cr: 1.5%, Mn: 0.9%, Mo: 3.6%, Ni : 5.4%, Cu: 0.8%, alloy additives: 0.68%, the balance of Fe, wherein the alloy additives are composed of 0.01% B, 0.25% V and 0.42% rare earths, the rare earths La, Ce and Nd are composed, and Fe is composed of 80% reduced iron powder and 20% carbonyl iron powder. Bearing steel balls are used as the grinding body, the ball-to-material ratio is 4:1, the material is unloaded after wet grinding for 45 hours, vacuum-dried, then pressed into shape with a cold isostatic press, vacuum sintered at 1420°C for 1 hour, and finally kept at 1070°C for 1 hour Air cooling after 1 hour to obtain the required TiC steel-bonded hard alloy material. Its performance is shown in Table 1.

[0025] Table 1. The physical properties of the TiC steel-bonded cemented carbide prepared by the e...

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Abstract

The invention discloses a high-titanium-carbide steel bond hard alloy mold material which comprises 55-65 wt% of titanium carbide and 35-45 wt% of iron-base binding phase. The iron-base binding phase comprises 0.2-0.6% of C, 1.5-4% of Cr, 0.8-1.8% of Mn, 2.0-4.0% of Mo, 2-8% of Ni, 0.5-2.0% of Cu, 0-1.01% of alloy additive and the balance of Fe. The preparation method comprises the following steps: thoroughly mixing the raw material powders according to the optimized proportion to obtain a mixed powder, and carrying out wet milling, filtration, drying, cold isostatic compaction, vacuum sintering and heat treatment to obtain the required mold material. The high-titanium-carbide steel bond hard alloy only adopts the normalizing heat treatment, the hardness reaches higher than HRA87, and the strength is high and satisfies the service performance of normal-temperature and high-temperature mold materials.

Description

technical field [0001] The invention belongs to the technical field of mold material preparation for powder metallurgy products, and in particular relates to a high-carbide titanium steel-bonded hard alloy mold material. Background technique [0002] With the transformation and upgrading of my country's manufacturing industry, the powder metallurgy products industry has developed rapidly, especially the annual output of iron-based products has reached hundreds of thousands of tons. Iron-based products are mainly molded, which consumes a lot of mold materials. Due to the limitation of alloy tool steel and alloy mold steel material itself, its wear resistance is poor, and the service life of the mold is short, which leads to high mold cost per unit product in the powder metallurgy products industry. Currently commonly used tungsten-cobalt cemented carbide and tungsten-cobalt-titanium cemented carbide have the characteristics of high hardness and good wear resistance, and have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/10C22C1/05
CPCC22C1/051C22C29/10
Inventor 陈文方哲成郭志猛
Owner LAIWU JINWEI NEW MATERIALS
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