CN104614283B - A kind of analysis method of corresponding object phase change in metal material heat treatment process - Google Patents
A kind of analysis method of corresponding object phase change in metal material heat treatment process Download PDFInfo
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- CN104614283B CN104614283B CN201510005843.5A CN201510005843A CN104614283B CN 104614283 B CN104614283 B CN 104614283B CN 201510005843 A CN201510005843 A CN 201510005843A CN 104614283 B CN104614283 B CN 104614283B
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Abstract
The present invention discloses a kind of analysis method of the corresponding object phase change in metal material heat treatment process.This method is according to the variation of the density of metal material to be measured, you can quantitative analysis and judges metal material material phase change situation to be measured.Density corresponding under metal material different heat treatment state to be measured is measured first, then using heat treatment temperature as abscissa, the density of metal material to be measured is ordinate, establishes the relational expression of the heat treatment temperature of metal material to be measured and the density of metal material to be measured, i.e. working curve；By the working curve diagram of gained, according to position of the density values of metal material to be measured in working curve diagram or by comparing the density under different conditions of heat treatment, rational judgment draws metal material to be measured in the corresponding object phase situation of a certain condition of heat treatment.The advantages of it is simple that there is the analysis method sample to prepare, easy to operate, and test data precision is high, and repeatability is high, and reliability is high.
Description
Technical field
The present invention relates to a kind of analysis method of the corresponding object phase change in metal material heat treatment process, these
Metal material includes steel material, aluminium alloy, magnesium alloy, titanium alloy etc., which is suitable for all with phase transition
Metal material.
Background technology
Metal material in process, will change its structure of matter state, for example, some steels and part aluminium, magnesium close
Golden material can be by being heat-treated to change the composition of its phase structure and phase, so as to achieve the purpose that change and improve material property.
The change of the microstate of metal material generally will also cause the variation of its size and other performances, such as the one of solid material
Grade phase transformation, with the change of its volume and size.Since such general very little of variation, and test and data handling procedure are answered
It is miscellaneous, it is difficult to practical.For example, when martensitic traoformation occurs for mild steel quenching, relative size variable quantity is only 0.1% quantity
Grade.In addition, this processing procedure will pass through high temperature（Such as 900 DEG C or so）Simultaneously water quenching is heated, the influence factor of this process measurement is more, such as
The fruit dimensional measurement forward and backward to same material processing, it is difficult to draw believable data result.If however, measurement quality and body
Long-pending ratio --- density, then measurable data for drawing reliable minor variations.
At present, measuring metallic materials object phase state has several methods, such as has the inspection in traditional metallographic observation method and modern times
Survey means such as X-ray diffraction, dilatometry, derivatography etc., indirect method have hardness measurement etc..But some are traditional
Metallographic observation method is time-consuming to take manpower, the quantitative levels as being difficult to draw object phase under microscope；Although modern test method can be straight
See ground and determine the object phase of substance, but in some, small enterprise, it is difficult to be equipped with modern large test instrument, and needs are sought help
Foreign aid analyzes, and instrumentation is complicated, costly；Thermodilatometric analysis needs on-line measurement time-consuming, costly；Hardness measurement
Precision is relatively low, and random error of measurement is big, influence factor is more, and experimental data repeatability is low.
The content of the invention
The purpose of the present invention, be in order to solve the Phase Transition Analysis of metal material during, skill is analyzed in existing quantitative measurment
The technical problems such as art complexity, testing expense height and the corresponding object phase change in a kind of metal material heat treatment process is provided
Analysis method.This method carrys out quantitatively characterizing metal material by the variable density of test analysis metal material phase transformation to be measured
Phase transformation situation.
The technical principle of the present invention
Some phase transition of metal material（Such as first order phase change）Must be with the change of volume, i.e., it also must be with density
Variation.It on the other hand, can be by secondary weighing method since density is a basic performance of solid material（Archimedes
Method）, measurement is realized with precision balance.The measurement of density is limited be subject to accuracy of instrument and equipment operation, pervious old-fashioned
Balance measurement, using artificial loading counterweight, cursor reads measurement data, operates time-consuming, poor repeatability, and error is big.Therefore,
Old-fashioned balance is difficult to effectively realize the accurate measurement of the present invention.In the past to the analysis of metal material phase transition, do not cause enough
Attention, unmanned proposition before this measures the phase transition with analysis of metallic materials with this method.
On the other hand, with the development of electronic technology, the cumbersome measurement that accurate electronic balance changes old-fashioned balance adds
The read method with measurement result is carried, measurement is convenient, and precision is greatly improved.The application utilizes current measuring instrument
Secondary weighing method is applied to this high precision measurement of metal material phase transformation and quantitative analysis field by progress.
A kind of analysis method of corresponding object phase change in metal material heat treatment process, specifically includes following step
Suddenly：
（1）, initially set up the temperature and density relationship of metal material to be measured
Metal material to be measured is first measured through density corresponding under different conditions of heat treatment, then using heat treatment temperature as
Abscissa, the density of metal material to be measured is ordinate, establishes the heat treatment temperature of metal material to be measured and the i.e. object phase transformation of density
The relational expression of change, i.e. working curve；
The metal material to be measured is steel, aluminium, magnesium, titanium or aluminium, magnesium and titanium alloy etc.；
The metal material to be measured through different conditions of heat treatment, annealing, quenching and tempering including various steel and
The states such as solid solution, the timeliness of steel and Al alloys andMg alloys；
Above-mentioned measurement of the metal material to be measured through the density corresponding to different conditions of heat treatment is by using secondary title
Weight method, that is, Archimedes method is measured from, and the concrete operation step of this mensuration is as follows：
First, the aerial quality of metal material to be measured under a certain condition of heat treatment is measured, is denoted asm 1；
Then, the metal material to be measured under a certain condition of heat treatment is placed in the container equipped with liquid, measurement is to be measured
Metal material is immersed in densityρ LiquidLiquid after quality, be denoted asm 2 ；
Finally, it is calculated as follows, obtains the density of the metal material to be measured under above-mentioned a certain condition of heat treatmentρ Object；
；
The above-mentioned measuring method of the density of metal material to be measured after different heat treatment temperatures, is also applied for through difference
Heat treatment temperature after metal material to be measured specific volume measurement；
（2）, pass through step（1）In working curve diagram, according to the density values of detected materials in working curve diagram
Density under position or by comparing different conditions of heat treatment, rational judgment draw metal material to be measured in a certain heat treatment
Corresponding object phase situation under state.
The analysis method of corresponding object phase change in a kind of above-mentioned metal material heat treatment process, is also applied for
The welding of metal, the material phase analysis during rolling or forging etc..
Beneficial effects of the present invention
The analysis method of corresponding object phase change in a kind of metal material heat treatment process of the present invention, by density
Method is applied to the quantitative analysis and research of the phase transformation of metal material, and this method has precision height, quick to metal material state change
Sense, the accuracy of relative density measurement is up to 0.01% and higher.
Further, the analysis side of the corresponding object phase change in a kind of metal material heat treatment process of the invention
Method can directly reflect the variation of the microstructure of metal material to be measured, and instrument is balance in analysis, simple and general, is surveyed
Instrument is without particular surroundings such as alternating temperature, vacuum during amount；And process is easy to operate, and the preparation of metal material to be measured is required not
Height, lossless to metal material to be measured, data processing is simple；Analytic process speed is fast, and energy consumption is low, and consumptive material is few, i.e., entire analysis is sentenced
Disconnected process does not require operating personnel to have very high knowwhy, reduces manpower, material resources, the consumption of financial resources.
Description of the drawings
The working curve of metal material to be measured in Fig. 1, embodiment 1.
Specific embodiment
The present invention is expanded on further below by specific embodiment and with reference to attached drawing, but is not intended to limit the present invention.
Instrument in the embodiment of the present invention used in quality determination is CP153 type electronic digit balances, sensibility reciprocal 10-3G, counterweight
Measure is 10g object relative measurement accuracy up to 0.01%.
Embodiment 1
A kind of analysis method of corresponding object phase change in metal material heat treatment process, specifically includes following step
Suddenly：
（1）, initially set up the temperature and density relationship of metal material to be measured
3 metal materials to be measured are first measured through density corresponding under different conditions of heat treatment, then with treatment temperature
For abscissa, density is ordinate, establishes the temperature of metal material to be measured and the relational expression of density, i.e. working curve；
The material of test to be analyzed is the aluminium alloy that the trade mark is 2XXX, and the size of three test buttons is about 20 ' 20 '
10mm, weight are more than 10g.Solution treatment is first passed through, this measurement is the measurement of its timeliness effect.Three specimen codings are respectively
G1, G2And G3；Wherein G1For 100 DEG C of timeliness；G2For 165 DEG C of timeliness, and it is sample to be tested to specify it；G3For 300 DEG C of timeliness, timeliness
Time is 5h.
Three samples measure density with secondary weighing method, and obtained density is respectivelyρ G1=2.8395（g/cm3）,ρ G2=
2.8347（g/cm3）Withρ G3=2.8273（g/cm3）, the relative error of measurement is ± 0.0003（g/cm3）.
By the above results, G1And G3Relative density difference be about 0.43%.By G1,G3The work of metal material to be measured can be established
Curve, specific oblique line as shown in Figure 1, line left end point are G1, right endpoint G3Point；
（2）, by step（1）The working curve of gained, according to detected materials G2Density values position in Fig. 1（I.e.
The point of centre in Fig. 1）, you can judge to treat the corresponding object phase of material（165 DEG C of ageds）；To judge whether it is expected
Phase transition；
By step（1）Density measurements know, G2Position in figure is substantially on expected line（Density it is opposite
Deviation is only 0.03%, in measurement range）.
It is indicated above：（1）The variable density useable linear variation of this ageing treatment carrys out approximate expression；（2）G2The place of sample
Science and engineering skill has reached expected result, and variable density meets（Linearly）Changing rule, deviation is small, negligible, i.e. the technique mistake
Journey and real processing results have reached expected technological requirement；（3）The approximately linear variation of the density of the material can be closed by solid solution
The Vegard theorems of gold give theoretical explanation, but details are not described herein.
This shows accuracy, the reliability of the analysis method of the present invention.
The above is only the citing of embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, without departing from the technical principles of the invention, several improvement and modification can also be made, these improve and become
Type also should be regarded as protection scope of the present invention.
Claims (2)
1. the analysis method of the corresponding object phase change in a kind of metal material heat treatment process, it is characterised in that it is analyzed
Process specifically comprises the following steps：
（1）, initially set up the temperature and density relationship of metal material to be measured：
Metal material to be measured is first measured through density corresponding under different conditions of heat treatment；Then using heat treatment temperature as horizontal seat
Mark, the density of metal material to be measured are ordinate, establish the close of the heat treatment temperature of metal material to be measured and metal material to be measured
The relational expression of degree, i.e. working curve；
The measurement of the metal material to be measured through the density corresponding to different conditions of heat treatment is by using Archimedes method
It is measured from, the concrete operation step of this mensuration is as follows：
First, measure through the aerial quality of metal material to be measured under a certain condition of heat treatment, record datam 1；
Then, metal material to be measured after heat treatment is placed in the container equipped with liquid, measures metal material leaching to be measured
It is not in densityρ LiquidLiquid after weight, obtain data valuem 2 ；
Finally, it is calculated as follows to obtain, the density of metal material to be measured after heat treatmentρ Object；
；
The detected materials are the metal material with phase transition；
The metal material with phase transition is steel, aluminium, magnesium, titanium, steel alloy, aluminium alloy or magnesium alloy；
（2）, pass through step（1）In working curve diagram, according to position of the density values of detected materials in working curve diagram,
Or by comparing the density under different conditions of heat treatment, rational judgment draws metal material to be measured in a certain condition of heat treatment pair
The object phase situation answered.
2. the analysis side of the corresponding object phase change in a kind of metal material heat treatment process as described in claim 1
Method, it is characterised in that measure the instrument precision balance used in metal material quality to be measured, sensibility reciprocal 10-3G and higher are to weight
10g object relative measurement accuracy is up to 0.01%.
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| CN105698746B (en) * | 2016-01-26 | 2018-05-15 | 上海应用技术学院 | A kind of measuring method of strain in metal material plastic processing |
| CN106896124A (en) * | 2017-04-24 | 2017-06-27 | 上海应用技术大学 | The assay method of corresponding residual austenite content in a kind of bearing steel material heat treatment process |
| CN108303441B (en) * | 2018-01-22 | 2020-11-10 | 哈尔滨工业大学 | Method for determining proportion of white tin converted into gray tin in tin and tin alloy samples |
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