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Detection and characterization method of intergranular fracture and trans-granular fracture of WC grains in WC-Co alloy

A technology of transgranular fracture and intergranular fracture, which is applied in the direction of using a stable bending force to test the strength of materials, measuring devices, and testing the strength of materials with a single impact force.

Active Publication Date: 2017-11-24
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the qualitative analysis and quantitative characterization of the intergranular fracture and transgranular fracture of the WC grain fracture of the cemented carbide hard phase, as well as the correlation research with the macroscopic properties of the cemented carbide, such as bending strength and impact toughness at room temperature, have not been involved.

Method used

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  • Detection and characterization method of intergranular fracture and trans-granular fracture of WC grains in WC-Co alloy
  • Detection and characterization method of intergranular fracture and trans-granular fracture of WC grains in WC-Co alloy
  • Detection and characterization method of intergranular fracture and trans-granular fracture of WC grains in WC-Co alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1: 5 cemented carbide samples with grade A and an average grain size of 1.6um were used to test the flexural strength, and the test results of each test strip were recorded according to serial numbers 1-5, as shown in Table 1.

[0033] Then carry out the cohesive phase Co removal treatment on the fractured surface of the sample, that is, put the fractured sample into an HCl solution with a concentration of 5% to 37%, and corrode for 1 to 10 minutes until the cohesive phase is removed. The specific corrosion time is judged by the fact that the bonding phase Co on the fracture surface is completely removed, such as figure 1 Typical morphology of the cemented carbide fracture surface after removal of the binder phase Co. The morphology of the fracture surface of this sample after removing Co is as follows: Figure 4 shown.

[0034] Then the above samples were cleaned and dried, that is, the fractured samples were first rinsed with distilled water, then cleaned wi...

Embodiment 2

[0042] Example 2: 5 cemented carbide samples with brand B and an average grain size of 3.2um were used to test the flexural strength, and the test results of each test strip were recorded according to the serial numbers 1-5, see Table 2.

[0043] Then, the binder phase Co removal treatment on the fracture surface of the sample is carried out, that is, the fracture sample is put into FeCl 3 In an etching solution in which the mass ratio of the solid to the HCl solution with a concentration of 5% to 37% is 1:2, etch for 1 to 10 minutes until the bonding phase is removed. The specific corrosion time is judged by the fact that the bonding phase Co on the fracture surface is completely removed, such as figure 1 Typical morphology of the cemented carbide fracture surface after removal of the binder phase Co. The fracture morphology of the fracture surface of this sample after removal of Co is as follows: Figure 6 shown.

[0044] Then the above samples were cleaned and dried, tha...

Embodiment 3

[0052] Example 3: 5 cemented carbide samples with the grade C and an average grain size of 3.2um were used to test the impact toughness, and the test results of each test strip were recorded according to the serial numbers 1-5, as shown in Table 3.

[0053] Then, the cohesive phase Co removal treatment on the fractured surface of the sample is performed, that is, the fractured sample is put into a 5% to 37% HCl solution, and corroded for 1 to 10 minutes until the cohesive phase is removed. The specific corrosion time is judged by the fact that the bonding phase Co on the fracture surface is completely removed, such as figure 1 Typical morphology of the cemented carbide fracture surface after removal of the binder phase Co. The fracture morphology of the fracture surface of this sample after removal of Co is as follows: Figure 8 shown.

[0054] Then the above samples were cleaned and dried, that is, the fractured samples were first rinsed with distilled water, then cleaned w...

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Abstract

The invention discloses a detection and characterization method of intergranular fracture and trans-granular fracture of WC grains in WC-Co alloy. The method successively comprises the following steps: conducting a bending strength test or an impact toughness test on a hard alloy test strip and recording a result; carrying out surface binder phase Co removal treatment on a fracture sample of a sample strip; cleaning and drying; observing trough a scanning electron microscope, and taking view pictures of different parts; counting grain number of hard phase WC grains of intergranular fracture and trans-granular fracture in the fracture sample (the total number is not lower than 200), calculating the proportion of trans-granular fracture grains, namely trans-granular fracture rate being characterized in the specification, and catalyzing and obtaining the relation between trans-granular fracture rate and bending strength or impact toughness. According to the invention, qualitative and quantitative analysis of intergranular fracture and trans-granular fracture of WC grains with hard phase alloy fractures can be carried out. The method of the invention plays a guiding role in quality control and scientific study of hard alloys.

Description

technical field [0001] The invention relates to the field of hard alloy analysis, in particular to a detection and characterization method for intergranular fracture and transgranular fracture of WC grains in a WC-Co alloy. Background technique [0002] The fracture is the record of the crack propagation process. The metal material fractures under the action of external force, leaving traces of the crack propagation process on the fracture surface. According to the crack traces, the origin, fracture nature, fracture form and fracture mechanism of the material fracture are analyzed. Cemented carbide fracture is a brittle fracture accompanied by a small amount of plastic deformation. There are three main types of fracture in cemented carbide: intergranular fracture, transgranular fracture, and binder phase Co ductile fracture. The bending strength of cemented carbide and the impact toughness at room temperature have a strong correlation with the fracture mode of the fracture....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/22G01N3/20G01N3/30
CPCG01N3/20G01N3/30G01N23/22G01N23/2202G01N2203/0023
Inventor 周华堂谢晨辉彭宇
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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