Laser cladding bonding-based cutter and workpiece diffusion couple making method

A technology of laser cladding and diffusion couple, applied in the field of mechanical and material science, to reduce the experimental cost and shorten the experimental period.

Inactive Publication Date: 2015-11-18

SHANDONG UNIV

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AI-Extracted Technical Summary

Problems solved by technology

The invention realizes the efficient preparation of the tool and the workpiece diffusion couple through the laser cladding method. During the preparation process, the high accuracy of the...

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Method used

D, step C gained tool sample 1 and workpiece sample 2 are to be bonded surface and cladding surface are carried out successively rough grinding, fine grinding on grinder, guarantee the smoothness of at least one corresponding surface preferably;

E, carry out grinding and polishing on the metallographic sample polishing machine to the mutual combin...

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Abstract

The invention relates to a laser cladding bonding-based cutter and workpiece diffusion couple making method. The method mainly comprises the following steps: 1, cutting a cutter or blade made of a known material to form a sample, and allowing the cut sample to have at least one groove or square cavity; 2, cutting a workpiece to be tested to form a sample, and laminating the cut sample to the sample obtained in step 1 to realize at least one common groove or square cavity; 3, grinding and polishing obtained two samples to make the two samples respectively have at least one polished surface; 4, laminating the polished surfaces of the two samples, clamping and fixing the two samples by using a clamp, and placing a cladding material in the groove or square cavity formed by the two samples; 5, bonding the two samples through a laser cladding technology to form a diffusion couple; 6, cleaning the produced diffusion couple, and carrying out heating and heat insulation in a heat insulation furnace; and 7, taking out the heat insulated diffusion couple, taking out a surface oxidation layer, polishing and cleaning, taking the core of the diffusion couple, and carrying out sample analysis.

Application Domain

Surface/boundary effectPreparing sample for investigation

Technology Topic

Surface oxidationEngineering +2

Image

Examples

Experimental program(1)

Example Embodiment

[0035] Example 1: Such as figure 1 As shown, a method for preparing a diffusion couple of a tool and a workpiece based on laser cladding bonding includes the following steps:

[0036] A. Choose the cemented carbide tool YG6 from Zhuzhou Cemented Carbide Factory as the tool sample 1, and the gray cast iron HT250 for the cylinder block of Weichai Power Engine as the workpiece sample 2.

[0037] B. Cut the tool sample 1 into a trapezoid structure of 16mm×8mm×6mm by wire cutting, and cut the workpiece sample 2 into a trapezoid structure of 16mm×8mm×4mm by wire cutting;

[0038] C. Cut the sample obtained in step A and step B twice, so that the two samples after cutting can form at least one groove or cavity after being bonded, which is used to place the cladding powder and facilitate the metallurgical state of the two samples Firmly combined

[0039] D. The surface to be bonded and the surface to be cladding of the tool sample 1 and the workpiece sample 2 obtained in step C are sequentially rough and finely ground on a grinder to ensure a good flatness of at least one corresponding surface;

[0040] E. Grind and polish the mutual bonding surface of tool sample 1 and workpiece sample 2 on a metallographic sample polishing machine. Use a three-coordinate measuring instrument MISTIAL775 to measure the flatness of the bonding surfaces of the two specimens, and use analytical pure acetone in ultrasonic Clean in the washing machine to ensure that the joint surface is clean and pollution-free, so as to better match each other;

[0041] Fix the two samples with a clamp, and place the cladding material in the groove or cavity formed by the two samples;

[0042] F. Fix the tool sample 1 and the workpiece sample 2 and apply the same amount of pre-tightening force to the bolts with a fixed torque wrench, and then select the appropriate powder material to apply laser cladding to the two ends of the mating part Carry out bonding and cladding, prepare "tool-workpiece" diffusion couple, and control the gap of the contact surface below 5μm;

[0043] G. After cleaning the prepared diffusion couple, put it in a holding furnace for heating and holding. The temperature is controlled to 800K, and the holding time is 30min. After high temperature, the gap of the contact surface is between 0-2μm;

[0044] H. Take out the diffusion couple, remove the oxide layer on the surface, polish and clean, then take the middle part of the diffusion couple for element diffusion analysis of the sample.

[0045] In the above preparation method, the clamp includes two clamping plates, any clamping plate has a through hole, and the two clamping plates clamp the two samples obtained in step D in the middle through a plurality of bolts and nuts.

[0046] In the specific experiment process, according to the different materials of workpiece sample 2 and tool sample 1, the cladding materials used are also different. The commonly used materials and properties are shown in Table 1:

[0047] Table 1 Commonly used laser cladding powder performance and parameters

[0048]

[0049] The specific operation process of laser cladding is as follows: select appropriate cladding zone 3 powder material according to the material of the workpiece and cutter; select reasonable power density, scanning speed, and powder feeding speed according to the size and thickness of the cladding zone 3. Under a certain action time, the smaller the particle size of the powder, the more fully the cladding zone 3 melts, and the smaller the tendency of cracks. When a carbon dioxide gas laser is used for laser cladding, the output power is 6kW (that is, the shielding gas 4 is carbon dioxide), the diameter of the laser beam 5 is 3mm, and the beam scanning speed is 500mm/min. The cladding zone and the substrate are in a good metallurgical bonding state, with high bonding strength, good wear resistance, corrosion resistance and heat resistance, and the heat affected zone of this method is small. The laser formed at the junction of the cladding zone 3 and the substrate The range of the heat-affected zone of the beam on the workpiece is about 0.3-1.0mm, which will not affect the observation of the diffusion zone in the experiment.

[0050] In the above method, the sample analysis is performed on an electron scanning microscope (SEM) and an energy spectrum analyzer (EDS). SEM observation is to perform line scan analysis on both sides of the diffusion interface between the tool material and the workpiece material to observe the content changes of different elements along the scan line. The method of EDS observation is to take some points on both sides of the diffusion interface between the tool and the workpiece. EDS element quantitative analysis is performed at each point to obtain the element content change curve, and the element diffusion law of the tool-workpiece material is analyzed based on the above results.

[0051] Using the method of the present invention to prepare diffusion couples can facilitate the study of diffusion experiments, can effectively avoid the oxidation of the contact surface, and can ensure that the direction of the SEM line scan is consistent with the direction of the actual diffusion position, which improves the experiment for the study of diffusion experiments. Efficiency, saving experiment cost.

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Classification and recommendation of technical efficacy words

Shorten the test cycle
Reduce experiment cost

Laser cladding bonding-based cutter and workpiece diffusion couple making method

A technology of laser cladding and diffusion couple, applied in the field of mechanical and material science, to reduce the experimental cost and shorten the experimental period.

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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