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Heat treatment method of WC-Co-Ni3Al hard alloy

A heat treatment method, the technology of wc-co-ni3al, is applied in the field of heat treatment of WC-Co cemented carbide, which can solve problems such as affecting the properties of the alloy, and achieve the effects of simple operation, obvious strengthening effect, and avoiding difficult cleaning and environmental pollution.

Active Publication Date: 2013-12-25
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can solve the stress problem caused by gas quenching, it will inevitably affect the improvement of alloy properties at the expense of the solid solubility of the bond relative to tungsten carbide.

Method used

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  • Heat treatment method of WC-Co-Ni3Al hard alloy
  • Heat treatment method of WC-Co-Ni3Al hard alloy
  • Heat treatment method of WC-Co-Ni3Al hard alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: as figure 1 As shown, the binder phase content of 10vol% WC-Co-Ni 3 Al cemented carbide is rapidly heated to 1300°C at a rate of 30°C / min under vacuum conditions, and then heat-preserved for 10 minutes for solution treatment; 2 . Cool to room temperature at a cooling rate of 100 °C / min; then, heat to 600 °C under vacuum at a rate of 30 °C / min, hold for 50 hours for aging treatment; then slowly cool to room temperature.

[0023] The three-point bending method was used to separate the WC-Co-Ni 3 The strength was measured before and after Al heat treatment (WC-Co was the reference sample). from Figure 4 It can be seen that for alloys with the same binder phase content, the WC-Co-Ni after the heat treatment method of the present invention 3 The flexural strength of Al cemented carbide is significantly higher than that of its unheated WC-Co-Ni 3 Al cemented carbide.

[0024] to WC-Co-Ni 3 The binder phase of Al cemented carbide before and after heat tre...

Embodiment 2

[0026] Embodiment 2: as image 3 As shown, the binder phase content of 10vol% WC-Co-Ni 3 Al cemented carbide is rapidly heated to 1300°C at a rate of 30°C / min under vacuum conditions, and then heat-preserved for 10 minutes for solution treatment; 2 . Cool to room temperature at a cooling rate of 100 °C / min; then heat to 600 °C under vacuum at a rate of 30 °C / min, hold for 50 hours for aging treatment; then slowly cool to room temperature.

[0027] The three-point bending method was used to separate the WC-Co-Ni 3 The strength was measured before and after Al heat treatment (WC-Co was the reference sample). from Figure 4 It can be seen that for alloys with the same binder phase content, the WC-Co-Ni after the heat treatment method of the present invention 3 The flexural strength of Al cemented carbide is significantly higher than that of its unheated WC-Co-Ni 3 Al cemented carbide.

[0028] to WC-Co-Ni 3 The binder phase of Al cemented carbide before and after heat tre...

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Abstract

The invention discloses a heat treatment method of a WC-Co-Ni3Al hard alloy. The heat treatment method sequentially comprises the following steps: heating the WC-Co-Ni3Al hard alloy to a solid solution temperature of 1000-1300 DEG C under a vacuum condition of lower than 1 Pa at a speed of not less than 10 DEG C / min, and then, preserving the temperature for 10-120 minutes to carry out a solid solution treatment; introducing high pressure N2 or Ar after the temperature maintaining treatment, and cooling the hard alloy to the room temperature at a cooling speed of not less than 100 DEG C / min; heating the hard alloy to 600-900 DEG C under a vacuum condition of lower than 1 Pa at a speed of not less than 10 DEG C / min, preserving the temperature for not less than 10 h to carry out an aging treatment; and then, slowly cooling the hard alloy to the room temperature to obtain the WC-Co-Ni3Al hard alloy with obviously increased gamma'(Ni3Al) phase precipitation amount; compared with an alloy without heat treatment, the precipitation amount of the gamma' phase in the heat treated alloy disclosed by the invention is obviously increased, the strengthening effect is more obvious, the bending strength of the alloy is further improved, obviously, and meanwhile, stress generated in an early stage gas quenching rapid cooling process can be eliminated; moreover, the heat treatment method is simple in process, simple and convenient to operate, efficient and environment-friendly.

Description

technical field [0001] The invention relates to a method for processing cemented carbide, in particular to a Ni 3 Heat treatment method of WC-Co cemented carbide with Al strengthened binder phase. Background technique [0002] WC-based cemented carbide is widely used as cutting tools, mining tools and wear-resistant parts due to its high strength, high hardness, high wear resistance and high red hardness. The existing WC-based cemented carbide materials are mainly composed of matrix WC and binder phase Co metal. Due to the good wettability of Co to WC, the comprehensive mechanical properties at room temperature are good, but its high temperature wear resistance, high temperature oxidation resistance and corrosion resistance are relatively low, which limits the use of Co as a binder phase to a certain extent. Application of WC-based cemented carbide. The intermetallic compound Ni 3 Al is an important strengthening component (i.e. γ′ phase) of nickel-based heat-resistant a...

Claims

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Application Information

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IPC IPC(8): C22F1/00C22C29/08C22C1/04
Inventor 龙坚战张忠健陆必志
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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