CN103048196B - Compressive strength test method for surface strengthening layer and substrate of axial part - Google Patents
Compressive strength test method for surface strengthening layer and substrate of axial part Download PDFInfo
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- CN103048196B CN103048196B CN201210572481.4A CN201210572481A CN103048196B CN 103048196 B CN103048196 B CN 103048196B CN 201210572481 A CN201210572481 A CN 201210572481A CN 103048196 B CN103048196 B CN 103048196B
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Abstract
The invention relates to a compressive strength test method for the surface strengthening layer and the substrate of an axial part. The method comprises the following steps: loading workpieces step by step to determine the pressure range for realizing damage on the workpieces, and then adopting a bisection approach method to precisely determine the pressure value for realizing damage. The method is simple, convenient and intuitive and has the advantages of strong operability reliable and accurate data and the like.
Description
Technical field
The invention belongs to the mechanical property detection technique technical field of metal material, particularly relate to a kind of intensity test method of Axle Surface strengthening layer and matrix.
Background technology
In actual applications, often require that axial workpiece has the combination properties such as higher intensity, toughness, skin hardness and wearing quality simultaneously.Carburizing is a kind of chemical heat treatment process often adopted, through quenching and lonneal after part carburizing, surface and core structure can be improved, obtain subsurface stratum and the heart portion of the superficial layer of hard high-strength, necessarily toughness, tough in outer hard, high strength and certain toughness comprehensively on same part.
Under some service condition, the compressive strength of carburizing axle is the key factor determining axial workpiece serviceable life.Therefore, in order to the safe handling of the normal use and machine that ensure part, the compressive strength of carburizing axle must be measured, but up to the present, temporarily without the data published.
Summary of the invention
The present invention provides a kind of intensity test method of Axle Surface strengthening layer and matrix for solving in known technology the technical matters that exists, and the method effectively can measure the compressive strength of Axle Surface strengthening layer and matrix.
The technical scheme that the present invention takes for the technical matters existed in solution known technology is:
An intensity test method for Axle Surface strengthening layer and matrix, comprises the following steps: a, carburizing heat treatment step;
B, finishing step to part to be tested surface, described finishing step is grinding part outer on cylindrical grinder;
It is characterized in that:
C, processing test surfaces step: on surface grinding machine, the cylindrical side of part to be tested is ground off 0.1 ~ 0.9mm, process plane;
D, lay part to be tested step: be securely fixed in by part to be tested on V shape iron, make planar horizontal upward, be then placed on universal testing machine, the specification of testing machine is 20 ~ 10000kN;
The compression test of e, part to be tested: test force is loading from 20kN, loading velocity is 0 – 12kN/s; After adding to test load, keep 0 – 60min, then unload;
F, observe part to be tested: take off part to be tested from testing machine, successively with the naked eye, the microscopic examination part to be tested surface of 10 times of magnifieres and 250 times, matrix and surface and matrix calmodulin binding domain CaM;
If g part to be tested is the intact vestige that there is no any damage still, test load is increased 20kN at every turn, and repeats following operation:
Be securely fixed in by part to be tested on V shape iron, make planar horizontal upward, be then placed on testing machine, the specification of testing machine is 20 ~ 10000kN; Test force is loading from 20kN, and loading velocity is 0 – 12kN/s; After adding to test load, keep 0 – 60min, then unload; Take off part to be tested from testing machine, successively with the naked eye, the microscopic examination part to be tested surface of 10 times of magnifieres and 250 times, matrix and surface and matrix calmodulin binding domain CaM;
H, when observing part to be tested and having micro-crack, by the test load of its correspondence reduce 10kN, then change an identical part to be tested and test under identical test condition; Now, if it is still intact to observe part to be tested, then test load is increased 5kN; If part to be tested damages, then test load is reduced 5kN;
I, by that analogy, adopts and increases progressively successive subtraction method, and namely each test load increased or reduce is the half that upper level part to be tested damages test load difference corresponding under intact test condition, is finally accurate to 1kN to test load;
J, record final test load when part to be tested damages: be compressive strength by final test load divided by the area of part to be tested plane.
The present invention can also by the following technical solutions:
Preferably, in the described finishing step to part to be tested surface, the surfaceness of grinding is 0.4 μm.
Preferably, in described processing test surfaces step, the surfaceness of grinding is 0.4 μm.
The advantage that the present invention has and good effect are:
Because the present invention adopts technique scheme, by the multistage loadings to workpiece, determine the pressure limit that can realize destruction to workpiece, then adopt two points of approximatiosses, accurately determine the force value that can realize destroying.This method of testing has easy, directly perceived, workable, the data reliably advantage such as accurate.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the A-A cut-open view of Fig. 1.
In figure: 1, surface strengthen layer; 2, matrix.
Embodiment
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Be ground to the planform of the workpiece that side is plane as shown in Fig. 1 Fig. 2.
An intensity test method for Axle Surface strengthening layer and matrix, comprises the following steps:
A, carburizing heat treatment step: adopt gas carbonizing method for the workpiece after machine work, heating-up temperature is 900 ~ 930 DEG C, and temperature retention time is 4 ~ 7h, and carburizing part to be tested is cooled to 760 ~ 850 DEG C of direct quenchings, then at 160 ~ 200 DEG C of tempering 2 ~ 3h.
B, finishing step to part to be tested surface, described finishing step is grinding part outer on cylindrical grinder, and the surfaceness of grinding is 0.4 – 1.6 μm;
C, processing test surfaces step: on surface grinding machine, the cylindrical side of part to be tested is ground off 0.1 ~ 0.9mm, process plane, the surfaceness of grinding is 0.4 – 1.6 μm;
D, lay part to be tested step: be securely fixed in by part to be tested on V shape iron, make planar horizontal upward, be then placed on testing machine, the specification of testing machine is 20 ~ 10000kN;
The compression test of e, part to be tested: test force is loading from 20kN, after adding to test load, keeps the regular hour, then unloads;
F, observe part to be tested: take off part to be tested from testing machine, successively with the naked eye, the microscopic examination part to be tested surface of 10 times of magnifieres and 250 times, matrix and surface and matrix calmodulin binding domain CaM;
If g part to be tested is the intact vestige that there is no any damage still, test load is increased 20kN at every turn, and repeats following operation:
Be securely fixed in by part to be tested on V shape iron, make planar horizontal upward, be then placed on testing machine, the specification of testing machine is 20 ~ 10000kN; Test force is loading from 20kN, and loading velocity is 0 – 12kN/s; After adding to test load, keep 0 – 60min, then unload; Take off part to be tested from testing machine, successively with the naked eye, the microscopic examination part to be tested surface of 10 times of magnifieres and 250 times, matrix and surface and matrix calmodulin binding domain CaM;
H, when observing part to be tested and having micro-crack, by the test load of its correspondence reduce 10kN, then change an identical part to be tested and test under identical test condition; Now, if it is still intact to observe part to be tested, then test load is increased 5kN; If part to be tested damages, then test load is reduced 5kN;
I, by that analogy, adopts and increases progressively successive subtraction method, and namely each test load increased or reduce is the half that upper level part to be tested damages test load difference corresponding under intact test condition, is finally accurate to 1kN to test load;
J, record final test load when part to be tested damages: be compressive strength by final test load divided by the area of part to be tested plane.
Claims (3)
1. an intensity test method for Axle Surface strengthening layer and matrix, comprises the following steps: a, carburizing heat treatment step;
B, finishing step to part to be tested surface, described finishing step is grinding part outer on cylindrical grinder;
It is characterized in that:
C, processing test surfaces step: on surface grinding machine, the cylindrical side of part to be tested is ground off 0.1 ~ 0.9mm, process plane;
D, lay part to be tested step: be securely fixed in by part to be tested on V shape iron, make planar horizontal upward, be then placed on testing machine, the specification of testing machine is 20 ~ 10000kN;
The compression test of e, part to be tested: test force is loading from 20kN, loading velocity is 0 – 12kN/s; After adding to test load, keep 0 – 60min, then unload;
F, observe part to be tested: take off part to be tested from testing machine, successively with the naked eye, the microscopic examination part to be tested surface of 10 times of magnifieres and 250 times, matrix and surface and matrix calmodulin binding domain CaM;
If g part to be tested is the intact vestige that there is no any damage still, test load is increased 20kN at every turn, and repeats following operation:
Be securely fixed in by part to be tested on V shape iron, make planar horizontal upward, be then placed on testing machine, the specification of testing machine is 20 ~ 10000kN; Test force is loading from 20kN, and loading velocity is 0 – 12kN/s; After adding to test load, keep 0 – 60min, then unload; Take off part to be tested from testing machine, successively with the naked eye, the microscopic examination part to be tested surface of 10 times of magnifieres and 250 times, matrix and surface and matrix calmodulin binding domain CaM;
H, when observing part to be tested and having micro-crack, by the test load of its correspondence reduce 10kN, then change an identical part to be tested and test under identical test condition; Now, if it is still intact to observe part to be tested, then test load is increased 5kN; If part to be tested damages, then test load is reduced 5kN;
I, by that analogy, adopts and increases progressively successive subtraction method, and namely each test load increased or reduce is the half that upper level part to be tested damages test load difference corresponding under intact test condition, is finally accurate to 1kN to test load;
J, record final test load when part to be tested damages: be compressive strength by final test load divided by the area of part to be tested plane.
2. an intensity test method for Axle Surface strengthening layer as claimed in claim 1 and matrix, is characterized in that: in the described finishing step to part to be tested surface, and the surfaceness of grinding is 0.4 – 1.6 μm.
3. an intensity test method for Axle Surface strengthening layer as claimed in claim 1 and matrix, is characterized in that: in described processing test surfaces step, and the surfaceness of grinding is 0.4 – 1.6 μm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101074918A (en) * | 2007-06-25 | 2007-11-21 | 南京航空航天大学 | Method for testing high-combination performance coating strength based on pressure experimental device and its sample |
| CN201607380U (en) * | 2010-01-29 | 2010-10-13 | 博凯机械(上海)有限公司 | Device for testing service life of surface coating |
| CN102128758A (en) * | 2010-11-19 | 2011-07-20 | 深圳金迈克精密科技有限公司 | Instrument for testing friction and wear performance of coating |
| CN102494998A (en) * | 2011-11-28 | 2012-06-13 | 哈尔滨工业大学 | Method for measuring combination strength of aluminum film of film aluminum steel composite board and steel substrate |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101074918A (en) * | 2007-06-25 | 2007-11-21 | 南京航空航天大学 | Method for testing high-combination performance coating strength based on pressure experimental device and its sample |
| CN201607380U (en) * | 2010-01-29 | 2010-10-13 | 博凯机械(上海)有限公司 | Device for testing service life of surface coating |
| CN102128758A (en) * | 2010-11-19 | 2011-07-20 | 深圳金迈克精密科技有限公司 | Instrument for testing friction and wear performance of coating |
| CN102494998A (en) * | 2011-11-28 | 2012-06-13 | 哈尔滨工业大学 | Method for measuring combination strength of aluminum film of film aluminum steel composite board and steel substrate |
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