Heat-resistant steel structure hard alloy and preparation method thereof

A steel-bonded hard alloy and heat-resistant technology, which is applied in the field of heat-resistant steel-bonded hard alloy and its preparation, can solve problems affecting the performance of the alloy, and achieve the effects of low manufacturing cost, high density, and avoiding segregation

Active Publication Date: 2015-02-04
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A ring-shaped solid solution with black heart structure in the core is often formed, which affects the performance of the alloy

Method used

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  • Heat-resistant steel structure hard alloy and preparation method thereof
  • Heat-resistant steel structure hard alloy and preparation method thereof
  • Heat-resistant steel structure hard alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: According to figure 1 The process shown is based on 34.8%WC, 15.2% saturated solid solution WC-TiC(3:7), 9%Co, 11.5%Ni 3 Al, 0.5% W powder and the rest of Fe powder are mixed evenly to form a mixture. The mixture is mixed according to the ball-to-material ratio of 6 and the liquid-solid ratio of 600ml / Kg. In the ball mill, alcohol is used as the wet grinding medium to carry out intensive wet grinding. After 48 hours, the wet-milled mixture was obtained; the wet-milled mixture was spray-dried and pressed into shape, and then the compact was subjected to vacuum solid-phase sintering at 1350°C to obtain a heat-resistant steel-bonded hard alloy, wherein the weight percentage of the binder phase was 50%.

Embodiment 2

[0025] Embodiment 2: According to figure 1 The flow shown is based on 21.1%WC, 28.9% saturated solid solution WC-TiC(3:7), 14%Co, 14%Ni 3Al, 0.5% Mo, 1% W powder and the rest of Fe powder are mixed evenly to form a mixture. The mixture is mixed according to the ball-to-material ratio of 6 and the liquid-solid ratio of 600ml / Kg. The wet grinding time is 48 hours to obtain the wet grinding mixture; the wet grinding mixture is spray-dried, pressed and formed, and then the compact is vacuum solid-phase sintered at 1350°C to obtain a heat-resistant steel-bonded cemented carbide, in which Phase weight percentage is 50%.

[0026] The preparation technological process of embodiment 3~9 of the present invention is as figure 1 As shown, its specific process parameters are shown in Table 2

[0027] Table 2 Preparation parameter table of the present invention

[0028]

[0029]

[0030]

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Abstract

The invention discloses a heat-resistant steel structure hard alloy. The heat-resistant steel structure hard alloy comprises a 10-50wt% of hard phase and the balance of a binding phase, wherein the hard phase consists of WC and TiC, and the binding phase consist of 18-38% of Co, 23-53% of Ni3Al, 0-2% of Mo, 0-2% of W and the balance of Fe. A preparation method of the heat-resistant steel structure hard alloy comprises the following steps: selecting hard phase raw materials, namely 0.1-34.8% of WC and 3.0-49.3% of statured sosoloid TiC-WC (3:7) powder as well as binding phase raw materials, namely 9.0-34.2% of Co, 11.5-47.7% of Ni3Al, 0-1.8% of Mo, 0-1.8% of W powder and the balance of Fe powder, wherein the total weight of the raw materials of the hard phase accounts for 10-50% of the total weight of the mixed powder; strengthening wet-milling for not smaller than 48 hours according to the ratio of grinding media to material (in terms of weight) of not lower than 6 and a liquid-solid ratio of 600-900ml/Kg; spraying, drying, pressing and molding the wet-milling mixed materials; performing vacuum solid-phase sintering at 1250-1350 DEG C to obtain the heat-resistant steel structure hard alloy, wherein the binding phase is 50%-90% in percentage by weight. The heat-resistant steel structure hard alloy disclosed by the invention is suitable for being used at 600-900 DEG C and is greatly improved in high-temperature oxidization resistance and high-temperature impact toughness.

Description

technical field [0001] The invention relates to a steel-bonded hard alloy material and a preparation method thereof, in particular to a heat-resistant steel-bonded hard alloy material prepared by powder metallurgy technology with WC and TiC hard phases as the matrix and Co-Fe-Ni as the binding phase. The invention relates to a quality alloy and a preparation method thereof, which are mainly used in forming mold products used under the temperature condition of 600-900°C. Background technique [0002] In the hot stamping forming industry at home and abroad, hot work die steel is widely used as the forming die, and the steel billet is heated and stamped into products such as screws and nuts. Due to this working state, the forming punch bears a large impact force and frequent impacts , and the temperature is high (600~900°C), which requires that the alloys used to manufacture forming dies such as forming punches have four properties: high temperature oxidation resistance, high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/06C22C1/05
CPCC22C1/051C22C29/06
Inventor 龙坚战张卫兵
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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