CN105606539B - DP780 dual phase steels martensite, ferrite, bainite detection method of content - Google Patents
DP780 dual phase steels martensite, ferrite, bainite detection method of content Download PDFInfo
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Abstract
DP780 dual phase steels martensite, ferrite, bainite detection method of content, DP780 dual phase steels martensite, ferrite, bainite mass percentage detection model are established by DOE method of experimental designs, Si, Mn, Cr, Nb element in DP780 and finishing temperature, ferrite transformation temperature, vacant time, coiling temperature data are substituted into detection model, you can accurate, quickly calculate martensite, ferrite, bainite structure mass percentage；The present invention has broken the detection method of martensite, ferrite, bainite structure content inside traditional DP780, it detects quick, accurate, at low cost, can timely and effectively feedback be provided to produced on-site, with preferable directiveness, technical staff according to testing result can effectively adjust the production technology at scene, be had a very important significance for being directed to the relevant Controlled cooling process optimization of steel grade development.
Description
Technical field
The present invention relates to DP780 dual phase steels hot-rolled coil interior tissue rapid detection method more particularly to a kind of DP780 are bis-
Phase steel martensite, ferrite, bainite detection method of content.
Background technology
Since there is low yield strength ratio, high work hardening index, high baking hardenability by the dual phase steel of main representative of DP780
It can, extend without surrender and the features such as room-temperature aging, therefore be the most common material of auto manufacturing.DP780 is mainly used in bottom
On disk, vehicle body, suspension, turning member and various load bearing beams；In addition, the deformational behavior of the steel grade also with the judgement of speed change of its own
Rate has close contact, the i.e. intensity of material that can be promoted with the increase of strain rate；This relevant characteristic of strain rate makes
It obtains material be subjected to generating the anti-deformation intensity of superelevation when high speed impact collision, the plastic deformation to pass through material itself generates
Plastic dissipative energy absorb impact in caused huge energy；The characteristic hardened due to its significant strain rate so that
Under the premise of ensureing crashworthiness steel plate thickness can be thinned, while achieving the purpose that automotive light weight technology in autobody sheet.
The property of DP780 is inseparable with its internal organizational structure, in general, main group in DP780 matrixes
It is woven to martensite and ferrite, which ensures that DP780 has excellent intensity and toughness；In addition, by cooling condition
Influence, a small amount of bainite structure can be inevitably generated in DP780 matrixes, and this tissue also can be to the power of DP780
It learns performance and generates large effect；Therefore, DP780 intrinsic silicons are grasped in time in process of production or during technique research and development
Martensite, ferrite, bainite constitute and its mass percentage, technical staff is understood in time the steel grade production effect
Fruit, and carry out relevant production technology optimization for the steel grade and have a very important significance.
In general, technical staff determines the martensite of intrinsic silicon, ferrite, bainite group after DP780 finish to gauge rapid cooling techniques
It is configured to and the method for mass percentage, mainly uses physical measure, i.e.,：DP780 is prepared into metallographic specimen first,
It is constituted using metallographic microscope tissues observed, according to the form of tissue, in conjunction with the mass percentage number of chemical composition in steel
According to analyzing the type of tissue；On this basis, using gray level method, the mass percentage of respective organization is analyzed.Meanwhile
In process of production, in order to eliminate testing equipment and manual operation error to the inside DP780 martensite, ferrite and bainite
The influence of mass percentage testing result, it is ensured that the accuracy of testing result, testing staff often try the same DP780
Sample carries out 2~3 duplicate tests, and requires：When the tissue types result in front and back detection is identical, and mass percentage
As a result when error rate absolute value is not more than 5%, i.e.,：
(η is the error rate absolute value of testing result), then it is assumed that result is consistent before and after the experiment, and correlated results is genuine and believable, has
The ability of the live actual production of guidance.
Physical measure although can relatively accurately analyze DP780 implement finish to gauge rapid cooling technique after tissue types and
Mass percentage, but this kind of method implements relatively complicated, and analytical cycle is longer, and experimentation cost is higher, therefore often
The needs that timely and effectively Instructing manufacture scene carries out process optimization cannot be met.Therefore, a kind of quick, accurate detection is developed
After finish to gauge rapid cooling in DP780 matrixes martensite, ferrite and bainite mass percentage method, for technical staff carry out
DP780 technology researchs are of great significance.
Invention content
Technical problem to be solved by the invention is to provide in matrix after a kind of quickly detection DP780 dual phase steel finish to gauge rapid cooling
The method of portion's martensite, ferrite, bainite structure mass percentage establishes DP780 dual phase steels by DOE method of experimental designs
Martensite, ferrite, bainite mass percentage detection model substitute into DP780 relevant parameters in detection model, accurate,
Quickly calculate martensite, ferrite, bainite structure mass percentage.
Solving the technical solution of above-mentioned technical problem is：
A kind of DP780 dual phase steels martensite, ferrite, bainite detection method of content, comprise the following steps：
(1), the mass percentage of Si, Mn, Cr, Nb element in DP780 is measured；
(2), DP780 dual phase steels martensite, ferrite, bainite mass percentage are established by DOE method of experimental designs
Detection model, wherein：
Martensite mass percentage：ηM=1970.31-2.56TFinish to gauge-0.80·TFerrite+13.89·tIt is air-cooled-0.12·
TIt batches-355.36·Si-970.26·Mn-422.98·Cr-409.27·Nb+0.0011·TFinish to gauge·TFerrite-0.020·
TFinish to gauge·tIt is air-cooled-4.45×10-5·TFinish to gauge·TIt batches+0.42·TFinish to gauge·Si+1.37·TFinish to gauge·Mn+0.66·TFinish to gauge·Cr-1.08·
TFinish to gauge·Nb-0.00087·TFerrite·tIt is air-cooled+0.00025·TFerrite·TIt batches+0.040·TFerrite·Si-0.12·TFerrite·Mn-
0.029·TFerrite·Cr+1.56·TFerrite·Nb-0.00049·tIt is air-cooled·TIt batches-0.0069·tIt is air-cooled·Si+1.63·tIt is air-cooled·
Mn+0.49·tIt is air-cooled·Cr-4.16·tIt is air-cooled·Nb+0.015·TIt batches·Si-0.0043·TIt batches·Mn-0.026·TIt batches·Cr-
0.12·TIt batches·Nb-7.51·Si·Mn-17.10·Si·Cr-402.29·Si·Nb-49.74·Mn·Cr+
145.63·Mn·Nb+185.21·Cr·Nb
In formula：ηMFor the martensite mass percentage in DP780 matrixes, unit：%；
Si, Mn, Cr, Nb are respectively the mass percentage of element silicon in DP780, manganese element, chromium, niobium element,
Unit：%；
TFinish to gaugeFor the finishing temperature of DP780, unit：℃；
TFerriteFor ferrite transformation temperature, unit：℃；
tIt is air-cooledFor the DP780 vacant times after being quickly cooled down for the first time, unit：s；
TIt batchesFor the coiling temperature of DP780, unit：℃；
Ferrite mass percentage：ηF=-1952.55+2.65TFinish to gauge+0.84·TFerrite-14.68·tIt is air-cooled+
0.18·TIt batches+335.51·Si+1013.48·Mn+433.14·Cr+102.91·Nb-0.0012·TFinish to gauge·TFerrite+
0.021·TFinish to gauge·tIt is air-cooled+0.000032·TFinish to gauge·TIt batches-0.36·TFinish to gauge·Si-1.43·TFinish to gauge·Mn-0.67·TFinish to gauge·Cr+
0.97·TFinish to gauge·Nb+0.0011·TFerrite·tIt is air-cooled-3.29×10-4·TFerrite·TIt batches-0.037·TFerrite·Si+0.13·
TFerrite·Mn+0.033·TFerrite·Cr-1.05·TFerrite·Nb+0.00058·tIt is air-cooled·TIt batches-0.17·tIt is air-cooled·Si-
1.86·tIt is air-cooled·Mn-0.64·tIt is air-cooled·Cr+4.32·tIt is air-cooled·Nb-0.014·TIt batches·Si+0.0052·TIt batches·Mn+
0.031·TIt batches·Cr+0.033·TVolume
It takes·Nb+1.89·Si·Mn+0.71·Si·Cr+461.25·Si·Nb+52.56·Mn·Cr-130.21·
Mn·Nb-170.83·Cr·Nb
In formula：ηFFor the ferrite mass percentage in DP780 matrixes, unit：%；
Si, Mn, Cr, Nb are respectively the mass percentage of element silicon in DP780, manganese element, chromium, niobium element,
Unit：%；
TFinish to gaugeFor the finishing temperature of DP780, unit：℃；
TFerriteFor ferrite transformation temperature, unit：℃；
tIt is air-cooledFor the DP780 vacant times after being quickly cooled down for the first time, unit：s；
TIt batchesFor the coiling temperature of DP780, unit：℃；
Bainite mass percentage：ηB=82.20-0.091TFinish to gauge-0.035·TFerrite+0.79·tIt is air-cooled-0.064·
TIt batches+19.58·Si-43.14·Mn-10.04·Cr+306.28·Nb+5.74×10-5·TFinish to gauge·TFerrite-0.0013·
TFinish to gauge·tIt is air-cooled+1.21×10-5·TFinish to gauge·TIt batches-0.052·TFinish to gauge·Si+0.059·TFinish to gauge·Mn+0.010·TFinish to gauge·Cr+
0.10·TFinish to gauge·Nb-2.25×10-4·TFerrite·tIt is air-cooled+8.09×10-5·TFerrite·TIt batches-0.0027·TFerrite·Si-
0.014·TFerrite·Mn-0.0038·TFerrite·Cr-0.51·TFerrite·Nb-8.54×10-5·tIt is air-cooled·TIt batches+0.17·
tIt is air-cooled·Si+0.23·tIt is air-cooled·Mn+0.15·tIt is air-cooled·Cr-0.17·tIt is air-cooled·Nb-0.0013·TIt batches·Si-0.00096·
TIt batches·Mn-0.0052·TIt batches·Cr+0.088·TIt batches·Nb+5.63·Si·Mn+16.46·Si·Cr-59.17·Si·
Nb-2.83·Mn·Cr-14.79·Mn·Nb-15.21·Cr·Nb
In formula：ηBFor the bainite mass percentage in DP780 matrixes, unit：%；
Si, Mn, Cr, Nb are respectively the mass percentage of element silicon in DP780, manganese element, chromium, niobium element,
Unit：%；
TFinish to gaugeFor the finishing temperature of DP780, unit：℃；
TFerriteFor ferrite transformation temperature, unit：℃；
tIt is air-cooledFor the DP780 vacant times after being quickly cooled down for the first time, unit：s；
TIt batchesFor the coiling temperature of DP780, unit：℃；
(3), by the finish to gauge of the mass percentage and the steel grade of Si, Mn, Cr, Nb element in the obtained DP780 of detection
Temperature, ferrite transformation temperature, vacant time, coiling temperature data are input in the detection model of step (2), calculate with it is upper
State the mass percentage of martensite in the relevant DP780 of input parameter, ferrite, bainite.
A kind of above-mentioned DP780 dual phase steels martensite, ferrite, bainite detection method of content, in the step (1)
The mass percentage of Si, Mn, Cr, Nb element of DP780 is measured using direct-reading spectrometer；Finish to gauge in the step (2)
Temperature TFinish to gauge, ferrite transformation temperature TFerrite, coiling temperature TIt batchesIt is measured using infrared radiation thermometer, vacant time tIt is air-cooledIt utilizes
Stopwatch is measured.
A kind of above-mentioned DP780 dual phase steels martensite, ferrite, bainite detection method of content, step (2) detection
Ferrite transformation temperature T in modelFerriteFor the temperature after being quickly cooled down for the first time, corresponding average cooling rate is 60 DEG C/
s；The air-cooled corresponding average cooling rates of the vacant time t of DP780 after being quickly cooled down for the first time are 4 DEG C/s；It is vacant from DP780
Terminate to be down to corresponding average cooling rate in coiling temperature T coiling processes to roll bending temperature to be 120 DEG C/s.
As shown in table 1 below, detection method of the invention fully considered main chemical elements Si, Mn in DP780, Cr,
Finishing temperature T in Nb mass percentages and rapid cooling techniqueFinish to gauge, ferrite transformation temperature TFerrite, vacant time tIt is air-cooled, batch
Temperature TIt batchesInteractivity between any two acts on the influence to the inside DP780 martensite, ferrite, bainite mass percentage,
The mass percentage of Si, Mn, Cr, Nb element in the DP780 that detection is obtained and finishing temperature, the ferrite of the steel grade
Transition temperature, vacant time, coiling temperature data are input to DP780 dual phase steels martensite, ferrite, bayesian weight percentage and contain
It measures in detection model, accurately calculates the quality of martensite in DP780 related to above-mentioned input parameter, ferrite, bainite
Percentage composition.
Interworking architecture figure between 1 DP780 various factors of table
" " symbol in table 1 indicates the interactivity effect between two kinds of parameters, this operation for acting on mathematical model
In be expressed as be multiplied relationship.
The beneficial effects of the invention are as follows：
The present invention has broken the detection method of martensite, ferrite, bainite structure content inside traditional DP780, detection
Quickly, accurate, at low cost, can feedback timely and effectively be provided to produced on-site, there is preferable directiveness, technical staff can
Effectively to be adjusted to the production technology at scene according to testing result, carry out relevant control bosher for being directed to the steel grade
Skill optimization has a very important significance.
Specific implementation mode
A kind of DP780 dual phase steels martensite of the present invention, ferrite, bainite detection method of content, comprise the following steps：
(1), the mass percentage of Si, Mn, Cr, Nb element in DP780 is measured using direct-reading spectrometer；
(2), DP780 dual phase steels martensite, ferrite, bainite mass percentage are established by DOE method of experimental designs
Detection model, wherein：
Martensite mass percentage：ηM=1970.31-2.56TFinish to gauge-0.80·TFerrite+13.89·tIt is air-cooled-0.12·
TIt batches-355.36·Si-970.26·Mn-422.98·Cr-409.27·Nb+0.0011·TFinish to gauge·TFerrite-0.020·
TFinish to gauge·tIt is air-cooled-4.45×10-5·TFinish to gauge·TIt batches+0.42·TFinish to gauge·Si+1.37·TFinish to gauge·Mn+0.66·TFinish to gauge·Cr-1.08·
TFinish to gauge·Nb-0.00087·TFerrite·tIt is air-cooled+0.00025·TFerrite·TIt batches+0.040·TFerrite·Si-0.12·TFerrite·Mn-
0.029·TFerrite·Cr+1.56·TFerrite·Nb-0.00049·tIt is air-cooled·TIt batches-0.0069·tIt is air-cooled·Si+1.63·tIt is air-cooled·
Mn+0.49·tIt is air-cooled·Cr-4.16·tIt is air-cooled·Nb+0.015·TIt batches·Si-0.0043·TIt batches·Mn-0.026·TIt batches·Cr-
0.12·TIt batches·Nb-7.51·Si·Mn-17.10·Si·Cr-402.29·Si·Nb-49.74·Mn·Cr+
145.63·Mn·Nb+185.21·Cr·Nb
In formula：ηMFor the martensite mass percentage in DP780 matrixes, unit：%；
Si, Mn, Cr, Nb are respectively the mass percentage of element silicon in DP780, manganese element, chromium, niobium element,
Unit：%；
TFinish to gaugeFor the finishing temperature of DP780, unit：℃；
TFerriteFor the temperature after being quickly cooled down for the first time, unit：DEG C, corresponding average cooling rate is 60 DEG C/s, by
In being quickly cooled down austenite that the stage is mainly DP780 intrinsic silicons for the first time to T iron ferritic, therefore TFerriteAlternatively referred to as iron
Ferritic transition temperature；
tIt is air-cooledFor the DP780 vacant times after being quickly cooled down for the first time, unit：S, corresponding average cooling rate are 4
℃/s；
TIt batchesFor the coiling temperature of DP780, unit：DEG C, from the vacant end of DP780 T is down to roll bending temperatureIt batchesIt is right in the process
The average cooling rate answered is 120 DEG C/s.
Ferrite mass percentage：ηF=-1952.55+2.65TFinish to gauge+0.84·TFerrite-14.68·tIt is air-cooled+
0.18·TIt batches+335.51·Si+1013.48·Mn+433.14·Cr+102.91·Nb-0.0012·TFinish to gauge·TFerrite+
0.021·TFinish to gauge·tIt is air-cooled+0.000032·TFinish to gauge·TIt batches-0.36·TFinish to gauge·Si-1.43·TFinish to gauge·Mn-0.67·TFinish to gauge·Cr+
0.97·TFinish to gauge·Nb+0.0011·TFerrite·tIt is air-cooled-3.29×10-4·TFerrite·TIt batches-0.037·TFerrite·Si+0.13·
TFerrite·Mn+0.033·TFerrite·Cr-1.05·TFerrite·Nb+0.00058·tIt is air-cooled·TIt batches-0.17·tIt is air-cooled·Si-
1.86·tIt is air-cooled·Mn-0.64·tIt is air-cooled·Cr+4.32·tIt is air-cooled·Nb-0.014·TIt batches·Si+0.0052·TIt batches·Mn+
0.031·TIt batches·Cr+0.033·TIt batches·Nb+1.89·Si·Mn+0.71·Si·Cr+461.25·Si·Nb+
52.56·Mn·Cr-130.21·Mn·Nb-170.83·Cr·Nb
In formula：ηFFor the ferrite mass percentage in DP780 matrixes, unit：%；
Si, Mn, Cr, Nb are respectively the mass percentage of element silicon in DP780, manganese element, chromium, niobium element,
Unit：%；
TFinish to gaugeFor the finishing temperature of DP780, unit：℃；
TFerriteFor the temperature after being quickly cooled down for the first time, unit：DEG C, corresponding average cooling rate is 60 DEG C/s, by
In being quickly cooled down austenite that the stage is mainly DP780 intrinsic silicons for the first time to T iron ferritic, therefore TFerriteAlternatively referred to as iron
Ferritic transition temperature；
tIt is air-cooledFor the DP780 vacant times after being quickly cooled down for the first time, unit：S, corresponding average cooling rate are 4
℃/s；
TIt batchesFor the coiling temperature of DP780, unit：DEG C, from the vacant end of DP780 T is down to roll bending temperatureIt batchesIt is right in the process
The average cooling rate answered is 120 DEG C/s.
Bainite mass percentage：ηB=82.20-0.091TFinish to gauge-0.035·TFerrite+0.79·tIt is air-cooled-0.064·
TIt batches+19.58·Si-43.14·Mn-10.04·Cr+306.28·Nb+5.74×10-5·TFinish to gauge·TFerrite-0.0013·
TFinish to gauge·tIt is air-cooled+1.21×10-5·TFinish to gauge·TIt batches-0.052·TFinish to gauge·Si+0.059·TFinish to gauge·Mn+0.010·TFinish to gauge·Cr+
0.10·TFinish to gauge·Nb-2.25×10-4·TFerrite·tIt is air-cooled+8.09×10-5·TFerrite·TIt batches-0.0027·TFerrite·Si-
0.014·TFerrite·Mn-0.0038·TFerrite·Cr-0.51·TFerrite·Nb-8.54×10-5·tIt is air-cooled·TIt batches+0.17·
tIt is air-cooled·Si+0.23·tIt is air-cooled·Mn+0.15·tIt is air-cooled·Cr-0.17·tIt is air-cooled·Nb-0.0013·TIt batches·Si-0.00096·
TIt batches·Mn-0.0052·TIt batches·Cr+0.088·TIt batches·Nb+5.63·Si·Mn+16.46·Si·Cr-59.17·Si·
Nb-2.83·Mn·Cr-14.79·Mn·Nb-15.21·Cr·Nb
In formula：ηBFor the bainite mass percentage in DP780 matrixes, unit：%；
Si, Mn, Cr, Nb are respectively the mass percentage of element silicon in DP780, manganese element, chromium, niobium element,
Unit：%；
TFinish to gaugeFor the finishing temperature of DP780, unit：℃；
TFerriteFor the temperature after being quickly cooled down for the first time, unit：DEG C, corresponding average cooling rate is 60 DEG C/s, by
In being quickly cooled down austenite that the stage is mainly DP780 intrinsic silicons for the first time to T iron ferritic, therefore TFerriteAlternatively referred to as iron
Ferritic transition temperature；
tIt is air-cooledFor the DP780 vacant times after being quickly cooled down for the first time, unit：S, corresponding average cooling rate are 4
℃/s；
TIt batchesFor the coiling temperature of DP780, unit：DEG C, from the vacant end of DP780 T is down to roll bending temperatureIt batchesIt is right in the process
The average cooling rate answered is 120 DEG C/s.
(3), the finishing temperature T of DP780 steel grades is measured with infrared radiation thermometerFinish to gauge, ferrite transformation temperature TFerriteWith curling temperature
Spend TIt batches, vacant time t is measured with stopwatchIt is air-cooled, by the mass percentage of Si, Mn, Cr, Nb element in the obtained DP780 of detection
And finishing temperature, ferrite transformation temperature, control time, the coiling temperature data of the steel grade are input to the detection of step (2)
In model, the mass percentage with martensite, ferrite, bainite in the relevant DP780 of above-mentioned input parameter is calculated.
The detection method of the present invention has fully considered that main chemical elements Si, Mn, Cr, Nb mass percentage in DP780 contains
Finishing temperature T in amount and rapid cooling techniqueFinish to gauge, ferrite transformation temperature TFerrite, vacant time tIt is air-cooled, coiling temperature TIt batchesTwo-by-two
Between interactivity act on influence to the inside DP780 martensite, ferrite, bainite mass percentage, detection is obtained
DP780 in Si, Mn, Cr, Nb element mass percentage and the finishing temperature of the steel grade, ferrite transformation temperature,
Vacant time, coiling temperature data are input to DP780 dual phase steels martensite, ferrite, bainite mass percentage detection mould
In type, the mass percentage of martensite in DP780 related to above-mentioned input parameter, ferrite, bainite is accurately calculated.
It elaborates to the present invention below by way of specific embodiment：
Example 1：
Using direct-reading spectrometer detect DP780 main chemical compositions mass percentage be respectively：Si 0.10%, Mn
1.60%, Cr 0.30%, Nb 0.03%, it is 800 DEG C to measure finishing temperature with infrared radiation thermometer, and ferrite transformation temperature is
750 DEG C, coiling temperature is 250 DEG C, and stopwatch measures the vacant time as 8s；By data above be conveyed into DP780 dual phase steels martensite,
Ferrite, bainite mass percentage detection model obtain corresponding martensite mass percentage ηMIt is 51.55%, iron
Ferritic mass percentage ηFIt is 45.13%, bainite mass percentage ηBIt is 3.43%.
Using traditional physical detection methods to martensites of the above-mentioned DP780 after implementing rapid cooling technique, ferrite, shellfish
Family name's weight percentage composition is detected, and testing result shows：Under above-mentioned technological parameter, martensite, iron element inside DP780
Body, bainite mass percentage be respectively 52.72%, 44.15% and 3.32%, the error of mass percentage result
Rate absolute value is respectively 2.27%, 2.17% and 3.21%, consistent with using the calculated result of the method for the present invention, to logical
It is genuine and believable to cross obtained result of calculation of the invention, has the ability for instructing produced on-site DP780.
Example 2：
Using direct-reading spectrometer detect DP780 main chemical compositions mass percentage be respectively：Si 0.10%, Mn
1.60%, Cr 0.60%, Nb 0.01%, it is 870 DEG C to measure finishing temperature with infrared radiation thermometer, and ferrite transformation temperature is
750 DEG C, coiling temperature is 350 DEG C, and stopwatch measures the vacant time as 20s；Data above is conveyed into DP780 dual phase steel geneva
Body, ferrite, bainite mass percentage detection model obtain corresponding martensite mass percentage ηMIt is 92.96%,
Ferrite mass percentage ηFIt is 3.61%, bainite mass percentage ηBIt is 3.48%.
Using traditional physical detection methods to martensites of the above-mentioned DP780 after implementing rapid cooling technique, ferrite, shellfish
Family name's weight percentage composition is detected.Testing result shows：Under above-mentioned technological parameter, martensite, iron element inside DP780
Body, bainite mass percentage be respectively 93.18%, 3.50% and 3.38%, the error of mass percentage result
Rate absolute value is respectively 0.24%, 3.05% and 2.87%, consistent with using the calculated result of the method for the present invention, to logical
It is genuine and believable to cross obtained result of calculation of the invention, has the ability for instructing produced on-site DP780.
Example 3：
Using direct-reading spectrometer detect DP780 main chemical compositions mass percentage be respectively：Si 0.10%, Mn
1.30%, Cr 0.30%, Nb 0.01%, it is 800 DEG C to measure finishing temperature with infrared radiation thermometer, and ferrite transformation temperature is
750 DEG C, coiling temperature is 250 DEG C, and stopwatch measures the vacant time as 8s；By data above be conveyed into DP780 dual phase steels martensite,
Ferrite, bainite mass percentage detection model obtain corresponding martensite mass percentage ηMIt is 43.25%, iron
Ferritic mass percentage ηFIt is 51.97%, bainite mass percentage ηBIt is 4.91%.
Using traditional physical detection methods to martensites of the above-mentioned DP780 after implementing rapid cooling technique, ferrite, shellfish
Family name's weight percentage composition is detected.Testing result shows：Under above-mentioned technological parameter, martensite, iron element inside DP780
Body, bainite mass percentage be respectively 42.11%, 53.19% and 4.79%, the error of mass percentage result
Rate absolute value is respectively 2.64%, 2.35% and 2.44%, consistent with using the calculated result of the method for the present invention, to logical
It is genuine and believable to cross obtained result of calculation of the invention, has the ability for instructing produced on-site DP780.
Claims (3)
1. a kind of DP780 dual phase steels martensite, ferrite, bainite detection method of content, it is characterised in that：It includes following step
Suddenly：
（1）, measure DP780 in Si, Mn, Cr, Nb element mass percentage；
（2）, establish by DOE method of experimental designs DP780 dual phase steels martensite, ferrite, the detection of bainite mass percentage
Model, wherein：
Martensite mass percentage：ηM=1970.31-2.56·TFinish to gauge-0.80·TFerrite+13.89·tIt is air-cooled-0.12·TIt batches-
355.36·Si-970.26·Mn-422.98·Cr-409.27·Nb+0.0011·TFinish to gauge·TFerrite-0.020·TFinish to gauge·tIt is air-cooled
-4.45×10-5·TFinish to gauge·TIt batches+0.42·TFinish to gauge·Si+1.37·TFinish to gauge·Mn+0.66·TFinish to gauge·Cr-1.08·
TFinish to gauge·Nb -0.00087·TFerrite·tIt is air-cooled+0.00025·TFerrite·TIt batches+0.040·TFerrite·Si-0.12·TFerrite·Mn
-0.029·TFerrite·Cr +1.56·TFerrite·Nb-0.00049·tIt is air-cooled·TIt batches-0.0069·tIt is air-cooled·Si+1.63·
tIt is air-cooled·Mn
+0.49·tIt is air-cooled·Cr-4.16·tIt is air-cooled·Nb+0.015·TIt batches·Si-0.0043·TIt batches·Mn-0.026·TIt batches·Cr
-0.12·TIt batches·Nb-7.51·Si·Mn-17.10·Si·Cr-402.29·Si·Nb-49.74·Mn·Cr+
145.63·Mn·Nb
+185.21·Cr·Nb
In formula：ηMFor the martensite mass percentage in DP780 matrixes, unit：%；
Si, Mn, Cr, Nb are respectively the mass percentage of element silicon in DP780, manganese element, chromium, niobium element, single
Position：%；
TFinish to gaugeFor the finishing temperature of DP780, unit：℃；
TFerriteFor ferrite transformation temperature, unit：℃；
tIt is air-cooledFor the DP780 vacant times after being quickly cooled down for the first time, unit：s；
TIt batchesFor the coiling temperature of DP780, unit：℃；
Ferrite mass percentage：ηF=-1952.55+2.65·TFinish to gauge+0.84·TFerrite-14.68·tIt is air-cooled+0.18·TIt batches+
335.51·Si+1013.48·Mn+433.14·Cr+102.91·Nb-0.0012·TFinish to gauge·TFerrite+0.021·TFinish to gauge·tIt is air-cooled
+0.000032·TFinish to gauge·TIt batches-0.36·TFinish to gauge·Si-1.43·TFinish to gauge·Mn-0.67·TFinish to gauge·Cr+0.97·TFinish to gauge·Nb
+0.0011·TFerrite·tIt is air-cooled-3.29×10-4·TFerrite·TIt batches-0.037·TFerrite·Si+0.13·TFerrite·Mn
+0.033·TFerrite·Cr-1.05·TFerrite·Nb+0.00058·tIt is air-cooled·TIt batches-0.17·tIt is air-cooled·Si-1.86·
tIt is air-cooled·Mn
-0.64·tIt is air-cooled·Cr+4.32·tIt is air-cooled·Nb-0.014·TIt batches·Si+0.0052·TIt batches·Mn+0.031·TIt batches·Cr
+0.033·TIt batches·Nb+1.89·Si·Mn+0.71·Si·Cr+461.25·Si·Nb+52.56·Mn·Cr-
130.21·Mn·Nb
-170.83·Cr·Nb
In formula：ηFFor the ferrite mass percentage in DP780 matrixes, unit：%；
Si, Mn, Cr, Nb are respectively the mass percentage of element silicon in DP780, manganese element, chromium, niobium element, single
Position：%；
TFinish to gaugeFor the finishing temperature of DP780, unit：℃；
TFerriteFor ferrite transformation temperature, unit：℃；
tIt is air-cooledFor the DP780 vacant times after being quickly cooled down for the first time, unit：s；
TIt batchesFor the coiling temperature of DP780, unit：℃；
Bainite mass percentage：ηB=82.20-0.091·TFinish to gauge-0.035·TFerrite+0.79·tIt is air-cooled-0.064·TIt batches+
19.58·Si-43.14·Mn-10.04·Cr+306.28·Nb+5.74×10-5·TFinish to gauge·TFerrite-0.0013·TFinish to gauge·tIt is air-cooled
+1.21×10-5·TFinish to gauge·TIt batches-0.052·TFinish to gauge·Si+0.059·TFinish to gauge·Mn+0.010·TFinish to gauge·Cr+0.10·
TFinish to gauge·Nb
-2.25×10-4·TFerrite·tIt is air-cooled+8.09×10-5·TFerrite·TIt batches-0.0027·TFerrite·Si-0.014·TFerrite·Mn
-0.0038·TFerrite·Cr-0.51·TFerrite·Nb-8.54×10-5·tIt is air-cooled·TIt batches+0.17·tIt is air-cooled·Si+0.23·
tIt is air-cooled·Mn
+0.15·tIt is air-cooled·Cr-0.17·tIt is air-cooled·Nb-0.0013·TIt batches·Si-0.00096·TIt batches·Mn-0.0052·
TIt batches·Cr
+0.088·TIt batches·Nb+5.63·Si·Mn+16.46·Si·Cr-59.17·Si·Nb-2.83·Mn·Cr-
14.79·Mn·Nb
-15.21·Cr·Nb
In formula：ηBFor the bainite mass percentage in DP780 matrixes, unit：%；
Si, Mn, Cr, Nb are respectively the mass percentage of element silicon in DP780, manganese element, chromium, niobium element, single
Position：%；
TFinish to gaugeFor the finishing temperature of DP780, unit：℃；
TFerriteFor ferrite transformation temperature, unit：℃；
tIt is air-cooledFor the DP780 vacant times after being quickly cooled down for the first time, unit：s；
TIt batchesFor the coiling temperature of DP780, unit：℃；
（3）, by the finishing temperature of the mass percentage of Si, Mn, Cr, Nb element and the steel grade in the obtained DP780 of detection,
Ferrite transformation temperature, vacant time, coiling temperature data are input to step（2）Detection model in, calculate with it is above-mentioned defeated
Enter the mass percentage of martensite in the relevant DP780 of parameter, ferrite, bainite.
2. a kind of DP780 dual phase steels martensite as described in claim 1, ferrite, bainite detection method of content, feature
It is：The step（1）The mass percentage of Si, Mn, Cr, Nb element of middle DP780 is measured using direct-reading spectrometer；
The step（2）Middle finishing temperature TFinish to gauge, ferrite transformation temperature TFerrite, coiling temperature TIt batchesIt is surveyed using infrared radiation thermometer
Fixed, vacant time tIt is air-cooledIt is measured using stopwatch.
3. a kind of DP780 dual phase steels martensite as claimed in claim 1 or 2, ferrite, bainite detection method of content,
It is characterized in that：The step（2）Ferrite transformation temperature T in monitoring modelFerriteFor the temperature after being quickly cooled down for the first time, institute is right
The average cooling rate answered is 60 DEG C/s；The vacant time t of DP780 after being quickly cooled down for the first timeIt is air-cooledCorresponding average cooling speed
Degree is 4 DEG C/s；From the vacant end of DP780 coiling temperature T is down to roll bending temperatureIt batchesCorresponding average cooling rate is in the process
120℃/s。
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