CN109253970A - A method of for testing laser cladding layer and substrate bond strength - Google Patents
A method of for testing laser cladding layer and substrate bond strength Download PDFInfo
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- CN109253970A CN109253970A CN201811175685.8A CN201811175685A CN109253970A CN 109253970 A CN109253970 A CN 109253970A CN 201811175685 A CN201811175685 A CN 201811175685A CN 109253970 A CN109253970 A CN 109253970A
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- Prior art keywords
- cladding layer
- bond strength
- matrix
- substrate bond
- laser cladding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to laser melting and coating technique fields, refer in particular to a kind of method for measuring laser cladding layer Yu substrate bond strength.Using hydraulic loaded method, liquid injection will be loaded according to vacancy in certain sample for requiring preparation, and be continuously increased pressure, finally make sample fracture, record test load-time graph, the bond strength of cladding layer and matrix is to load the maximum value of pressure.
Description
Technical field
The present invention relates to laser melting and coating technique fields, refer in particular to a kind of for measuring laser cladding layer and substrate bond strength
Method, this method also extend to other surfaces paint-on technique.
Background technique
Laser melting and coating technique is a kind of utilization laser beam high power density (104~106W/cm2), the gold for irradiating stimulated light
Metal surface melts rapidly, extends and rapidly solidifies with cladding layer material, so that acquisition and metal base metallurgical bonding, have excellent
The novel surface processing technique of good physics, chemistry or mechanical property surface peening layer, the cladding layer formed by laser melting coating are past
Toward with the excellent properties such as wear-resisting, anti-corrosion, heat-resisting, anti-oxidant.In practice, cladding layer/basis material typically fails mould engineering
Formula is peeling of the cladding layer on matrix.Cladding layer means structure, equipment or device from the peeling on matrix in some sense
The failure of part, interface cohesion it is good whether from the service life for being largely fixed this material.Therefore, it characterizes and comments
Valence cladding layer/basis material interface cohesion mechanics performance just seems very important.
Currently, there are many methods for testing cladding layer and substrate combinating strength, but since laser melting and coating technique obtains
Cladding layer and matrix high bond strength, bring difficulty to measurement.American standard of testing material association ASTMC633-79
The method of proposition, due to being limited by adhesive strength, test scope is usually less than 90MPa, is not particularly suited for high bond strength
Measurement test.And De Deng state compares the scarification of tendency, physical significance is still not clear, and obtained data are more dispersed, difficult
With effective evaluation binding performance.Up to the present, although many measure method is used widely, one kind, which is not yet received, to be had
Physical significance is specified, facilitates and implements and convenient for the evaluation method of measurement high bond strength.
Summary of the invention
The purpose of the present invention is to propose to a kind of hydraulic loaded methods, overcome the limitation of adhesive strength, can firmly learn to do section
Evaluate the high bond strength testing method of cladding layer and matrix.
Test specimen is prepared using laser melting and coating technique, test specimen is cylinder Dual-layer structure, cylindrical radius a,
Height is h；Lower part is matrix, and with a thickness of 2/3h, top is cladding layer, with a thickness of 1/3h；It is opened centered on the center of circle of matrix bottom surface
Hole to cladding layer bottom surface composition specimen sample is hollow, and aperture radius is 2/3a.Aperture front end is helicitic texture, is easily installed hydraulic
Loading device, the helicitic texture of aperture front end should meet the preparation of GB T15756-2008 screw thread and require；Using hydraulic loaded method,
Will load liquid injection specimen sample it is hollow in, and be continuously increased pressure, be finally broken specimen sample, record test load-when
Half interval contour, cladding layer and substrate combinating strength calculation formula are as follows:
σb=Pmax
In formula
σbCladding layer and substrate combinating strength
PmaxLoad the maximum value of pressure.
The hydraulic loaded speed of hydraulic loading device is 1~20MPa/s, and load liquid can be common for pure water, hydraulic oil etc.
Hydraulic medium.
Further, aperture front end 1/2h is helicitic texture.
It is an advantage of the invention that overcoming the latter since adhesive strength is limited compared with viscose process, it is impossible to be used in height combines
The characteristics of intensity cladding layer bonding strength test, the fracture process of this method are positive stress fracture, and data are easy to measure, and calculate
It is relatively simple with data.
Detailed description of the invention
Fig. 1 is sample to be tested sample schematic diagram.
Embodiment
The present invention is further explained in the light of specific embodiments, but protection scope of the present invention is not limited only to implement
Example.
The present embodiment uses 45 steel for matrix, and coating material is self-control Ni based powders.It is prepared and is tried using laser melting and coating technique
Sample is tested, laser cladding technological parameter range is as follows: 1000~3000W of laser power, 1000~5000mm/min of scanning speed,
1~4mm of spot diameter, 10~25L/h of flow velocity of protective gas argon gas.Screw thread is the standard of national standard M8 × 1.0.Hydraulic loading device
Hydraulic loaded speed be 10MPa/s, load liquid be pure water.The bond strength data of acquisition are as shown in table 1.
The size actually worked it out there are certain error, stablized by the cladding layer obtained using this method and substrate bond strength
Preferable, the reliable measuring data of property.
Claims (5)
1. a kind of method for measuring laser cladding layer Yu substrate bond strength, which is characterized in that specific step is as follows: using
Laser melting and coating technique prepares test specimen, and test specimen is cylinder Dual-layer structure；Lower part is matrix, and top is cladding layer；
It is hollow that specimen sample is constituted using the matrix bottom surface center of circle as center aperture to cladding layer bottom surface；Aperture front end is helicitic texture, is used for
Hydraulic loading device is installed；It is using hydraulic loaded method, load liquid injection specimen sample is hollow interior, and it is continuously increased pressure, most
It is broken specimen sample eventually, records test load-time graph, the bond strength of cladding layer and matrix is equal to load pressure most
Big value.
2. a kind of method for measuring laser cladding layer Yu substrate bond strength as described in claim 1, which is characterized in that
Cylindrical radius is a, is highly h；Lower part matrix thickness is 2/3h；Top cladding layer is with a thickness of 1/3h；It is with the matrix bottom surface center of circle
The aperture radius at center is 2/3a.
3. a kind of method for measuring laser cladding layer Yu substrate bond strength as described in claim 1, which is characterized in that
The helicitic texture of aperture front end should meet the preparation of GB T 15756-2008 screw thread and require.
4. a kind of method for measuring laser cladding layer Yu substrate bond strength as described in claim 1, which is characterized in that
The hydraulic loaded speed of hydraulic loading device is 1~20MPa/s, and load liquid is that pure water or hydraulic oil often use hydraulic medium.
5. a kind of method for measuring laser cladding layer Yu substrate bond strength as described in claim 1, which is characterized in that
Aperture front end 1/2h is helicitic texture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811175685.8A CN109253970A (en) | 2018-10-10 | 2018-10-10 | A method of for testing laser cladding layer and substrate bond strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811175685.8A CN109253970A (en) | 2018-10-10 | 2018-10-10 | A method of for testing laser cladding layer and substrate bond strength |
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| CN109253970A true CN109253970A (en) | 2019-01-22 |
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| CN201811175685.8A Pending CN109253970A (en) | 2018-10-10 | 2018-10-10 | A method of for testing laser cladding layer and substrate bond strength |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990043A (en) * | 2017-06-12 | 2017-07-28 | 中国矿业大学 | A kind of metal coating interface bond strength measurement apparatus and method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990043A (en) * | 2017-06-12 | 2017-07-28 | 中国矿业大学 | A kind of metal coating interface bond strength measurement apparatus and method |
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Application publication date: 20190122 |