CN105588773A - Method and apparatus for obtaining Brinell hardness of nickel-based high temperature alloy - Google Patents
Method and apparatus for obtaining Brinell hardness of nickel-based high temperature alloy Download PDFInfo
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- CN105588773A CN105588773A CN201410558731.8A CN201410558731A CN105588773A CN 105588773 A CN105588773 A CN 105588773A CN 201410558731 A CN201410558731 A CN 201410558731A CN 105588773 A CN105588773 A CN 105588773A
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Abstract
The invention relates to a method and an apparatus thereof for obtaining Brinell hardness of a nickel-based high temperature alloy. The method comprises the following steps: obtaining surface roughness of the nickel-based high temperature alloy; measuring the measurement point corresponding to the surface roughness to obtain a Brinell hardness measured value of the nickel-based high temperature alloy; and according to a quantification relation between the Brinell hardness and the surface roughness of the nickel-based high temperature alloy, using the Brinell hardness of the nickel-based high temperature alloy to obtain a real Brinell hardness calculated value of the nickel-based high temperature alloy. The quantification relation between Brinell hardness and the surface roughness of the nickel-based high temperature alloy is HBW - HBW<0> = 12Ra<0.27> - 19; in the formula, Ra expresses the surface roughness of the nickel-based high temperature alloy, the unit is nm, and Ra is greater than or equal to 3 nm and less than 1300 nm; HBW<0> expresses the real Brinell hardness calculated value of the nickel-based high temperature alloy; and the HBW expresses Brinell hardness measured value of the nickel-based high temperature alloy under different roughness.
Description
Technical field
The present invention relates to Brinell hardness technical field, particularly a kind of method of the Brinell hardness of obtaining nickel base superalloy andDevice.
Background technology
GH4145 nickel base superalloy is with γ ' [Ni3(Al, Ti, Nb)] for being out of shape high temperature, closes by the age-hardening type of main hardening constituentGold, has good relaxation resistance, antioxygenic property and creep rupture strength, be extensively used as 300MW, 600MW,The even fastening bolt of the parts such as 1000MW power generator turbine cylinder, throttle, flange. Under super (super-) critical operating mode,Can there is the variation of microscopic structure in process in GH4145 bolt, thereby cause its creep and enduring quality to decline under arms,In macroscopic view, show as hardness number and raise, therefore, GH4145 is normally monitored by measuring Brinell hardness in thermal power plantThe variation of bolt performance. People's Republic of China's power industry standard " thermal power plant high temperature fastener technology directive/guide " (DL/TRegulation 439-2006), the Brinell hardness HBW of GH4145 bolt should, within the scope of 262-331, surpass moving rear hardnessTarget bolt should be changed and scrap, and therefore, whether very important ball hardness number is accurately.
Be mainly to obtain Brinell hardness with desk-top Brinell hardness tester at present, this method precision is high, but because of itself feature, surveysExamination has certain limitation. Mostly be large-scale in-service parts because often need to test the parts of Brinell hardness, in test, Bu Shi is hardWhile spending, obtain comparatively accurate actual ball hardness number if want, need dissect the rear test of fine grinding for large-scale in-service parts, someAlthough undersized parts can be dissected, certain depth and will reaching after a less surface roughness also needs to be polishedJust can obtain actual accurate ball hardness number, this has certain damage to parts, and some are had to precision or thickness requirementParts are infeasible.
How the in the situation that of in defective component not, obtaining the Brinell hardness that accuracy is high is current urgent problem.
Summary of the invention
Destruction problem to parts while testing Brinell hardness for solving in prior art, the present invention proposes one and obtains nickel-base high-temperatureThe method of the Brinell hardness of alloy and device, utilize quantitative relationship between the Brinell hardness of material and its surface roughness, obtainsThe Brinell hardness comparatively approaching with measured value.
For achieving the above object, the invention provides a kind of method of the Brinell hardness of obtaining nickel base superalloy, the method bagDraw together:
Obtain the surface roughness of nickel base superalloy;
To described surface roughness accordingly measurement point measure, obtain the brineling value of nickel base superalloy;
According to the quantitative relationship between the Brinell hardness of nickel base superalloy and surface roughness, utilize described nickel base superalloyBrineling value obtain the actual Brinell hardness calculating value of nickel base superalloy.
Preferably, the quantitative relationship between the Brinell hardness of described nickel base superalloy and its surface roughness is:
HBW-HBW0＝12Ra0.27-19
In above formula, Ra represents the surface roughness of nickel base superalloy, and unit is nm, 3nm≤Ra < 1300nm; HBW0Be expressed as the actual Brinell hardness calculating value of nickel base superalloy; HBW represents the Brinell hardness of nickel base superalloy under different roughnessMeasured value.
Preferably, obtaining by probe-type surface profiler of described surface roughness undertaken.
Preferably, obtaining by Brinell hardness tester of the brineling value of described nickel base superalloy undertaken, described inIt is the carbide alloy pressure head of 5mm and the test force of 750 kgfs that Brinell hardness tester has diameter.
For achieving the above object, the present invention also provides a kind of device of the Brinell hardness of obtaining nickel base superalloy, this deviceComprise:
Surface roughness acquiring unit, for obtaining the surface roughness of nickel base superalloy;
Brineling unit, for to described surface roughness accordingly measurement point measure, obtain nickel-base high-temperature closeThe brineling value of gold;
Actual ball hardness number computing unit, for according to determining between the Brinell hardness of nickel base superalloy and surface roughnessMagnitude relation, utilizes the brineling value of described nickel base superalloy to obtain the actual Brinell hardness calculating of nickel base superalloyValue.
The Brinell hardness of the nickel base superalloy that preferably, described ball hardness number computing unit adopts and its surface roughness itBetween quantitative relationship be:
HBW-HBW0＝12Ra0.27-19
In above formula, Ra represents the surface roughness of nickel base superalloy, and unit is nm, 3nm≤Ra < 1300nm; HBW0Be expressed as the actual Brinell hardness calculating value of nickel base superalloy; HBW represents the Brinell hardness of nickel base superalloy under different roughnessMeasured value.
Preferably, described surface roughness acquiring unit is obtained surface roughness by probe-type surface profiler.
Preferably, described brineling unit obtains actual ball hardness number by Brinell hardness tester, described Brinell hardnessIt is the carbide alloy pressure head of 5mm and the test force of 750 kgfs that meter has diameter.
Technique scheme has following beneficial effect:
(1) quantitative relationship between Brinell hardness and its surface roughness of employing nickel base superalloy, can realize different surfacesThe conversion of GH4145 alloy ball hardness number under roughness. The actual Brinell hardness calculating value that adopts above-mentioned quantitative relationship to obtainHBW0And the error between Brinell hardness actual value is in ± 1.3% scope, easy and simple to handle, reduce error and labour intensity,Improve operating accuracy. And solve in the time of test in order to obtain the destruction problem of ball hardness number to parts accurately, simultaneouslyThe wear extent that both can reduce when polishing to in-service parts, can obtain again ball hardness number comparatively accurately, and this is for to wallThe strict parts of thick requirement have greater significance.
(2) even because surface roughness is less than 1600nm, it still has considerable influence to the ball hardness number of GH4145 alloy,Therefore, the present invention is that the improvement of GH4145 bolt measurement method for Brinell hardness and even the revision of GB GB/T231.1-2009 are carriedSupply foundation.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing skillIn art description, the accompanying drawing of required use is briefly described, and apparently, the accompanying drawing in the following describes is only the present inventionSome embodiment, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also rootObtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the quantitative relationship curve map between surface roughness and its ball hardness number of nickel base superalloy;
Fig. 2 is the method flow diagram of a kind of Brinell hardness of obtaining nickel base superalloy that the present invention proposes;
Fig. 3 is the device block diagram of a kind of Brinell hardness of obtaining nickel base superalloy that the present invention proposes.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completelyDescribe, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment. Based on thisEmbodiment in invention, those of ordinary skill in the art are not making the every other reality obtaining under creative work prerequisiteExecute example, all belong to the scope of protection of the invention.
The technical program operation principle: existing result of study shows: the roughness of sample surfaces is to metal material (cast iron, steel)Ball hardness number have larger impact, the sample that surface roughness is little, its hardness number is also lower. Caluclate table surface roughness withBetween Brinell hardness, should belong to simple linear relationship. But existing result of study has only provided a more general conclusion,The roughness that is sample surfaces has larger impact to the ball hardness number of metal material, but it is not pointed out qualitatively on surfaceWhen roughness Ra < 1600nm, whether Metal Surface Roughness still has considerable influence to its Brinell hardness. More do not provide concreteQuantitative relationship between metallic surface roughness and brineling value. Know by paying creationary experiment work:In the time of Ra < 1600nm, Metal Surface Roughness still has considerable influence to its Brinell hardness, and surface roughness and Brinell hardness are surveyedQuantitative relationship between value, as the fit line in Fig. 1, is not the simple linear relationship of predicting before. As shown in Figure 1, existIn the constant situation of Brinell hardness actual value, between surface roughness and brineling value, meet:HBW-HBW0＝12Ra0.27-19; According to this quantitative formula, to not destroying the cloth measuring in parts situationFamily name's hardness number is revised, and obtains actual Brinell hardness calculating value. Compare with Brinell hardness actual value, this calculated value veryApproach Brinell hardness actual value.
Based on above-mentioned operation principle, the present invention proposes a kind of method of the Brinell hardness of obtaining nickel base superalloy, as Fig. 2 instituteShow. The method comprises:
Step 201): the surface roughness of obtaining nickel base superalloy;
Step 202): to described surface roughness accordingly measurement point measure, obtain the Brinell hardness of nickel base superalloyMeasured value;
Step 203): according to the quantitative relationship between the Brinell hardness of nickel base superalloy and surface roughness, utilize described nickelThe brineling value of based high-temperature alloy obtains the actual Brinell hardness calculating value of nickel base superalloy.
Preferably, the quantitative relationship between the Brinell hardness of described nickel base superalloy and its surface roughness is:
HBW-HBW0＝12Ra0.27-19
In above formula, Ra represents the surface roughness of nickel base superalloy, and unit is nm, 3nm≤Ra < 1300nm; HBW0Be expressed as the actual Brinell hardness calculating value of nickel base superalloy; HBW represents the cloth of nickel base superalloy under different roughnessFamily name's hardness measurement value.
Preferably, obtaining by probe-type surface profiler of described surface roughness undertaken.
Preferably, obtaining by Brinell hardness tester of the brineling value of described nickel base superalloy undertaken, described inIt is the carbide alloy pressure head of 5mm and the test force of 750 kgfs that Brinell hardness tester has diameter.
As shown in Figure 3, a kind of device block diagram of the Brinell hardness of obtaining nickel base superalloy proposing for the present invention. This deviceComprise:
Surface roughness acquiring unit 301, for obtaining the surface roughness of nickel base superalloy;
Brineling unit 302, for to described surface roughness accordingly measurement point measure, obtain Ni-based heightThe brineling value of temperature alloy;
Actual ball hardness number computing unit 303, for according between the Brinell hardness of nickel base superalloy and surface roughnessQuantitative relationship, utilize the brineling value of described nickel base superalloy to obtain the actual Brinell hardness of nickel base superalloyCalculated value.
Brinell hardness and its surface of the nickel base superalloy that preferably, described actual ball hardness number computing unit 303 adoptsQuantitative relationship between roughness is:
HBW-HBW0＝12Ra0.27-19
In above formula, Ra represents the surface roughness of nickel base superalloy, and unit is nm, 3nm≤Ra < 1300nm; HBW0Be expressed as the actual Brinell hardness calculating value of nickel base superalloy; HBW represents the cloth of nickel base superalloy under different roughnessFamily name's hardness measurement value.
Preferably, described surface roughness acquiring unit 301 is obtained surface roughness by probe-type surface profiler.
Preferably, described brineling unit 302 obtains actual ball hardness number by Brinell hardness tester, described Bu ShiIt is the carbide alloy pressure head of 5mm and the test force of 750 kgfs that hardometer has diameter
Below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail, but specific embodiment of the inventionMode is not limited to following embodiment.
Embodiment 1
For the GH4145 alloy of HBW=350, in the time of surface roughness Ra=3nm, by the quantitative relationship in the present inventionThe ball hardness number HBW calculating0=353, and Brinell hardness actual value is 350, the mistake between calculated value and actual valueDifference is 0.9%.
Embodiment 2
For the GH4145 alloy of HBW=395, in the time of surface roughness Ra=397nm, by the quantitative pass in the present inventionThe ball hardness number HBW that system calculates0=354, and Brinell hardness actual value is 350, between calculated value and actual valueError is 1.0%.
Embodiment 3
For the GH4145 alloy of HBW=410, in the time of surface roughness Ra=1294nm, by the quantitative pass in the present inventionThe ball hardness number HBW that system calculates0=346, and Brinell hardness actual value is 350, between calculated value and actual valueError is-1.2%.
Embodiment 4
For the GH4145 alloy of HBW=335, in the time of surface roughness Ra=4nm, by the quantitative relationship in the present inventionThe ball hardness number HBW calculating0=337, and Brinell hardness actual value is 335, the mistake between calculated value and actual valueDifference is 0.6%.
Embodiment 5
For the GH4145 alloy of HBW=381, in the time of surface roughness Ra=430nm, by the quantitative pass in the present inventionThe ball hardness number HBW that system calculates0=338, and Brinell hardness actual value is 335, between calculated value and actual valueError is 1.0%.
Embodiment 6
For the GH4145 alloy of HBW=396, in the time of surface roughness Ra=1211nm, by the quantitative pass in the present inventionThe ball hardness number HBW that system calculates0=333, and Brinell hardness actual value is 335, between calculated value and actual valueError is-0.5%.
Embodiment 7
For the GH4145 alloy of HBW=306, in the time of surface roughness Ra=5nm, by the quantitative relationship in the present inventionThe ball hardness number HBW calculating0=306, and Brinell hardness actual value is 306, the mistake between calculated value and actual valueDifference is 0%.
Embodiment 8
For the GH4145 alloy of HBW=351, in the time of surface roughness Ra=389nm, by the quantitative pass in the present inventionThe ball hardness number HBW that system calculates0=310, and Brinell hardness actual value is 306, between calculated value and actual valueError is 1.3%.
Embodiment 9
For the GH4145 alloy of HBW=365, in the time of surface roughness Ra=1131nm, by the quantitative pass in the present inventionThe ball hardness number HBW that system calculates0=304, and Brinell hardness actual value is 306, between calculated value and actual valueError is-0.7%.
Known through above-described embodiment analysis, between ball hardness number and Brinell hardness actual value that employing quantitative relationship calculatesError in ± 1.3% scope, can, in the situation that not destroying parts, get the Brinell hardness being close with actual value.
Above-described detailed description of the invention, has carried out further in detail object of the present invention, technical scheme and beneficial effectIllustrate, institute it should be understood that and the foregoing is only the specific embodiment of the present invention, is not intended to limit the present inventionProtection domain, within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., all should wrapWithin being contained in protection scope of the present invention.
Claims (8)
1. a method of obtaining the Brinell hardness of nickel base superalloy, is characterized in that, the method comprises:
Obtain the surface roughness of nickel base superalloy;
To described surface roughness accordingly measurement point measure, obtain the brineling value of nickel base superalloy;
According to the quantitative relationship between the Brinell hardness of nickel base superalloy and surface roughness, utilize described nickel base superalloyBrineling value obtain the actual Brinell hardness calculating value of nickel base superalloy.
2. the method for claim 1, is characterized in that, the Brinell hardness of described nickel base superalloy and its surfaceQuantitative relationship between roughness is:
HBW-HBW0＝12Ra0.27-19
In above formula, Ra represents the surface roughness of nickel base superalloy, and unit is nm, 3nm≤Ra < 1300nm; HBW0Be expressed as the actual Brinell hardness calculating value of nickel base superalloy; HBW represents the cloth of nickel base superalloy under different roughnessFamily name's hardness measurement value.
3. the method for claim 1, is characterized in that, obtaining of described surface roughness is by probe-type tableFacial contour instrument carries out.
4. the method for claim 1, is characterized in that, the brineling value of described nickel base superalloyObtain by Brinell hardness tester and undertaken, described Brinell hardness tester has the carbide alloy pressure head and 750 that diameter is 5mmThe test force of kgf.
5. a device that obtains the Brinell hardness of nickel base superalloy, is characterized in that, this device comprises:
Surface roughness acquiring unit, for obtaining the surface roughness of nickel base superalloy;
Brineling unit, for to described surface roughness accordingly measurement point measure, obtain nickel-base high-temperature closeThe brineling value of gold;
Actual ball hardness number computing unit, for according to determining between the Brinell hardness of nickel base superalloy and surface roughnessMagnitude relation, utilizes the brineling value of described nickel base superalloy to obtain the actual Brinell hardness calculating of nickel base superalloyValue.
6. device as claimed in claim 5, is characterized in that, the Ni-based height that described ball hardness number computing unit adoptsQuantitative relationship between the Brinell hardness of temperature alloy and its surface roughness is:
HBW-HBW0＝12Ra0.27-19
In above formula, Ra represents the surface roughness of nickel base superalloy, and unit is nm, 3nm≤Ra < 1300nm; HBW0Be expressed as the actual Brinell hardness calculating value of nickel base superalloy; HBW represents the cloth of nickel base superalloy under different roughnessFamily name's hardness measurement value.
7. device as claimed in claim 5, is characterized in that, described surface roughness acquiring unit is by probe-type tableFacial contour instrument obtains surface roughness.
8. device as claimed in claim 5, is characterized in that, described brineling unit passes through Brinell hardness testerObtain actual ball hardness number, described Brinell hardness tester has carbide alloy pressure head that diameter is 5mm and 750 kgfsTest force.
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Cited By (1)
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| CN113218796A (en) * | 2021-04-16 | 2021-08-06 | 上海交通大学 | Method for detecting relation between strain and hardness of material |
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Cited By (2)
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