CN104281774B - Forecasting Methodology of the Q＆P steel in different strain rate Dan Lahou residual austenite contents - Google Patents
Forecasting Methodology of the Q＆P steel in different strain rate Dan Lahou residual austenite contents Download PDFInfo
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Abstract
The invention discloses a kind of Q＆P steel different strain rate Dan Lahou residual austenite contents Forecasting Methodology；Instantaneous residual austenite content and strain rate, the expression formula of equivalent plastic strain after the deformation of Q＆P steel are derived first；Then plate initial austenite content is measured；Plate is stretched to default strain in different strain rate, is unloaded and measurement remnant austenite content, expression formula of the plate different strain rate Dan Lahou residual austenite contents with equivalent plastic strain is obtained based on test data fitting；Query graph is drawn based on expression formula；Finally, the equivalent plastic strain after measuring deformation, Q＆P steel residual austenite content after different strain rate simple tension can be accurately predicted with reference to the strain rate of deformation process.The method has the advantages that simple, accurate, with low cost and easy to implement.Accurate Prediction can be carried out to the residual austenite content of the plate after punching press, according to the method for the improvement of Sheet Metal Forming Technology provides foundation, so as to accelerate to promote Q＆P steel.
Description
Technical field
It is residual in different strain rate Dan Lahou the present invention relates to technical field of metal material formation, more particularly to a kind of Q＆P steel
The Forecasting Methodology of remaining austenite content.
Background technology
As auto industry is to body lightening and the continuous improvement of passive safety requirement, using High-strength light-weight material
Material has become the effective means of loss of weight.AHSS is because of its excellent mechanical property, the application percentage on vehicle body
Increase year by year, have been widely used for formed automotive body structural member and reinforcer at present, such as A/B/C posts, door anti-collision joist, crossbeam,
Longeron etc..
U.S. Speer in 2003 etc. proposes a kind of new technology for preparing high-strength vehicle steel, quenching-distribution
(Quenching and partitioning) technique.This technique can be used to produce and contain martensite, ferrite and steady at room temperature
Determine the Multiphase Steel of retained austenite, the steel grade intensity and plasticity have reached good unification, and preparation cost is cheap, is considered as
It is advanced high-strength steel of future generation.There is document it has been reported that the TRIP effects of Q＆P steel, that is, strain-induced residual austenite during shaping
To martensite transfor mation, while this transformation causes that material has high intensity, plasticity is also obtained raising to body.Phase change induction plasticity
(TRIP) effect causes that Q＆P steel has good mechanical property, and many documents show that strain rate is the important of influence TRIP effects
Factor.
Suitable Sheet Metal Forming Technology is formulated in actual production, the transformation of retained austenite during part deformation is rationally controlled
Amount, helps to give full play to the plasticity of Q＆P steel plate materials and ensures the follow-up crystallized ability of material.Therefore, it is quantitative, quick, accurate
Prediction forming process Transformation of Retained Austenite it is significant.However, the strain rate of actual punching course sheet metal deformation compared with
Greatly, beyond the quasistatic strain rate scope of traditional experiment, and the strain rate of variety classes part punching process may not
Together, therefore, what conventional method drew can not represent actual punching press based on quasistatic strain rate Transformation of Retained Austenite rule
Journey, it is difficult to which the retained austenite phase transformation law to actual punching course carries out Accurate Prediction, is not suitable for commercial Application.
The content of the invention
It is an object of the invention to overcome the shortcomings of that above-mentioned prior art is present, there is provided a kind of Q＆P steel is in different strain rate
The Forecasting Methodology of Dan Lahou residual austenite contents.The method considers shadow of the strain rate effect to strain induced martensite transformation
Ring, compared with tradition is based on quasi-static experiment, the more situation of closing to reality punching press is greatly improved precision of prediction.The party
Method is accurate, quick and easy to implement, the residual austenite content of plate after different strain rate simple tension can be carried out accurate pre-
Survey, for the improvement of Sheet Metal Forming Technology provides foundation, so as to accelerate the popularization of Q＆P steel.
The purpose of the present invention is achieved through the following technical solutions：
The present invention relates to the prediction side that a kind of Q＆P steel draws (simple tension) residual austenite content afterwards in different strain rate list
Method, methods described comprises the following steps：
A, the relation for assuming Q＆P steel strain induced martensite transformation speed and strain rate and equivalent plastic strain, then push away
Instantaneous retained austenite volume fraction is derived with corresponding strain rate and the formula of equivalent plastic strain；
B, preparation Q＆P steel plates material list draw sample, measure the initial residual austenite volume content of plate；
C, interruption one directional tensile test is carried out to sample under different strain rate, when measuring differently strained in corresponding sample
The retained austenite volume content of heart point；
D, equivalent plastic strain and corresponding retained austenite volume content that different strain rate list is drawn the lower measure of experiment
The formula that are derived of test data fitting step A in parameter item, two and three dimensions inquiry is drawn based on the expression formula set up
Figure；
E, the equivalent ductility being derived by measuring after deforming under the conditions of Q＆P steel plate material any strain rates of simple tension sample should
Become, with reference to described in step D expression formula or query graph can quantitative forecast Q＆P steel plate materials it is residual after different strain rate simple tension
Remaining austenite content.
Preferably, the step C is specially：By sample, different strain rate carries out simple tension at room temperature, is loaded into pre-
If strain, then unloads and measures the retained austenite volume content of sample central point.
Preferably, in step D, the expression formula is：
Wherein,It is strain rate,It is to refer to strain rate, εPIt is equivalent plastic strain, fγIt is in strain rateUnder the conditions of
Simple tension is to equivalent plastic strain εPCorresponding instantaneous retained austenite volume content.
Preferably, in step D, the query graph is according to retained austenite volume content, correspondence equivalent ductility after deformation
The three-dimensional query graph that strain and strain rate are drawn.
Preferably, in step D, the query graph is, by the equivalent line projection of retained austenite volume content, to be made
Two-dimentional query graph.
Preferably, the measurement of the equivalent plastic strain is using contact extensometer, non-contact type extensometer, grid measurement
The method such as method or digital image correlation technique (DIC) is carried out.
Preferably, the grid mensuration is specially：Roundness mess is printed on Q＆P steel plate material samples, is passed through after deformation
The change of grid can obtain primary and secondary strain on measurement sample, then according to constancy of volume principle, i.e. ε1+ε2+ε3=0, can obtain three
The principal strain ε in direction1、ε2、ε3, can then converse corresponding equivalent plastic strain.
Compared with prior art, the present invention has the advantages that：
The method of prediction Q＆P steel plate materials residual austenite content after different strain rate simple tension that the present invention is provided,
Its good effect is the influence for considering different strain rate to strain induced martensite transformation, is drawn with traditional quasi-static test
Martensite transfor mation rule compare, can more press close to the situation of the actual punching press of part, greatly improve precision of prediction.With it is quick,
Accurate and easy to implement advantage, reduces time cost and financial cost.
Brief description of the drawings
The detailed description made to non-limiting example with reference to the following drawings by reading, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the three-dimensional query graph of residual austenite content of the invention, plastic equivalent strain and strain rate；
Fig. 2 is residual austenite content two dimensional equivalent line query graph of the invention.
Specific embodiment
With reference to specific embodiments and the drawings, the present invention is described in detail.Following examples will be helpful to this area
Technical staff further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the general of this area
For logical technical staff, without departing from the inventive concept of the premise, various modifications and improvements can be made.These are belonged to
Protection scope of the present invention.
Embodiment
The present embodiment is related to a kind of method of prediction Q＆P steel residual austenite content after different strain rate simple tension,
Comprise the following steps：
(1) as a example by the QP980 plates in this example with thickness as 1.2mm, it is assumed that the deformation martensite phase of the plate
Variable Rate is with the relation of strain rate and equivalent plastic strain：
Wherein, v represents the strain induced martensite transformation speed of plate, is defined as in specific equivalent plastic strain remaining difficult to understand
The change of family name's body volume content, εpBe equivalent plastic strain, α is material constant, β be represent deformation pattern and environment temperature etc. its
, to straining the influence of induced phase transition, environment temperature and deformation pattern are constant in the present embodiment, therefore its value is unique, can for his factor
It is considered constant, fγInstantaneous retained austenite volume fraction is represented,Retained austenite minimum volume fraction is represented, also
It is the saturation value for representing strain induced martensite transformation,It is the function related to strain rate；
In order to simplify formula, it is assumed that retained austenite can all change into martensite, i.e.,Based on above phase
Variable Rate is as follows with the formula that the relation derivation of equivalent plastic strain, strain rate goes out instantaneous retained austenite volume fraction：
(2) prepare some QP980 steel plates material lists and draw sample, the retained austenite body before deformation is measured with X-ray diffraction method
Fraction is fγ0=10.61%；
(3) sample in draw speed Isosorbide-5-Nitrae .5, is being carried out into one directional tensile test respectively under 45 and 450mm/min, it is right respectively
Answer 0.0002,0.001,0.01 and 0.1s-1Four kinds of different strain rates, are loaded into after certain strain and unload and measure sample center
The retained austenite volume content of point；
(4) the different equivalent plastic strain for being obtained with step (3) and the test data of corresponding residual austenite content, intend
Conjunction obtains the instantaneous austenite volume content table of step (1) up to some constants in formula, after setting up different strain rate simple tension
The expression formula of residual austenite content；
Assuming thatBe defined static strain rate, and strain rate is in this scope without the concern for strain rate effect.With ten thousand
Energy one directional tensile test machine is by sample in 1mm/minDraw speed under to be stretched to differently strained amount right
After unload, differently strained corresponding residual austenite content under measurement quasistatic, fitting obtains strain rate for 0.0002s-1Bar
Residual austenite content under part after simple tension is as follows with the expression formula of corresponding equivalent plastic strain：
Wherein, fγ1For strain rate is 0.0002s-1Under the conditions of retained austenite volume fraction after simple tension；For
The fitting coefficient related to strain rate, because not considering strain rate effect under with reference to strain rate, value is 1；β is fitting system
Number, is together decided on by deformation pattern and environment temperature, and environment temperature and deformation pattern are constant in this experiment, therefore its value is only
One, take β=1.66；α is the intrinsic parameter of material, and its value does not change with experimental condition, can be by room temperature quasistaticSingle draw experiment to determine that its value is -0.26；εpIt is equivalent plastic strain.Obtained after fittingWhen,α=- 0.26, i.e.,
Similarly, with omnipotent one directional tensile test machine by sample 4.5mm/min draw speedIt is drop-down
Reach differently strained, then unload, measure differently strained corresponding residual austenite content, fitting obtains strain rate and is
0.001s-1Under conditions of residual austenite content after simple tension it is as follows with the expression formula of corresponding equivalent plastic strain：
Wherein, fγ2For strain rate is 0.001s-1Under the conditions of retained austenite volume fraction after simple tension；For
The fitting coefficient related to strain rate；εpIt is equivalent plastic strain.Obtained after fittingWhen,
I.e.
With omnipotent one directional tensile test machine by sample 45mm/min draw speedUnder be stretched to not
With dependent variable and then unloading, differently strained corresponding residual austenite content is measured, fitting obtains strain rate for 0.01s-1Bar
Residual austenite content under part after simple tension is as follows with the expression formula of corresponding equivalent plastic strain：
Wherein, fγ3For strain rate is 0.01s-1Under the conditions of retained austenite volume fraction after simple tension；
It is the fitting coefficient related to strain rate.Obtained after fittingWhen,I.e.
With omnipotent one directional tensile test machine by sample 450mm/min draw speedUnder be stretched to not
With dependent variable and then unloading, differently strained corresponding residual austenite content is measured, fitting obtains strain rate for 0.1s-1Condition
Residual austenite content after lower simple tension is as follows with the expression formula of corresponding equivalent plastic strain：
Wherein, fγ4For strain rate is 0.1s-1Under the conditions of retained austenite volume fraction after simple tension；It is the fitting coefficient related to strain rate.Obtained after fittingWhen,I.e.
Martensitic traoformation rule more than under four kinds of strain rate states, fitting coefficient
Value it is related to strain rate, be strain rateFunction, it is assumed thatWherein,It is reference
Strain rate, k is fitting coefficient.
When,
When,
When,
When,
Fitting obtains k=0.0993, i.e.,
Therefore, the content that can obtain retained austenite after QP980 plate different strain rate simple tensions is：
According to expression formula, the relation of residual austenite content and equivalent plastic strain and strain rate is depicted as graphics
Shape, such as Fig. 1, X-axis is equivalent plastic strain in figure, and Y-axis is strain rate, and Z axis are residual austenite content；Or by residual austenite
The equivalent line projection of body volume fraction, is depicted as two-dimentional query graph as shown in Figure 2, and X-axis is equivalent plastic strain, Y-axis in figure
It is environment temperature；
(4) roundness mess is printed on sample, the change after deformation by measuring grid on sample can obtain primary and secondary strain, so
Afterwards according to constancy of volume principle, i.e. ε1+ε2+ε3=0, can obtain three principal strain ε in direction1、ε2、ε3, it is right then to converse
The equivalent plastic strain answered.
For example, as it is known that certain room temperature list is pulled through journey strain rate for 0.05s-1, equivalent plastic strain is 0.11, by query graph 1 or
Person's query graph 2 can quickly find retained austenite volume fraction and be about 8.0%.
Specific embodiment of the invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can within the scope of the claims make various deformations or amendments, this not shadow
Sound substance of the invention.
Claims (6)
1. a kind of Forecasting Methodology of Q＆P steel in different strain rate Dan Lahou residual austenite contents, it is characterised in that methods described
Comprise the following steps：
A, the relation for assuming Q＆P steel strain induced martensite transformation speed and strain rate and equivalent plastic strain, then derive
Instantaneous retained austenite volume fraction and corresponding strain rate and the formula of equivalent plastic strain；
Specially：Assuming that the strain induced martensite transformation speed of Q＆P steel is with the relation of strain rate and equivalent plastic strain：
Wherein, v represents the strain induced martensite transformation speed of plate, is defined as retained austenite in specific equivalent plastic strain
The change of volume content, εpIt is equivalent plastic strain, α is material constant, and β is to represent that deformation pattern and environment temperature are lured strain
The influence of phase transformation is sent out, its value is unique in environment temperature and constant deformation pattern, it is believed that be constant, fγRepresent instantaneous residual austenite
Body volume fraction,Represent retained austenite minimum volume fraction, that is, the saturation for representing strain induced martensite transformation
Value,It is the function related to strain rate；
Assuming that retained austenite is completely converted into martensite, i.e.,Based on above transformation rate and equivalent plastic strain, answer
The formula that the relation derivation of variability goes out instantaneous retained austenite volume fraction is as follows：
fγ0It is the retained austenite volume fraction before deformation；
B, preparation Q＆P steel plates material list draw sample, measure the initial residual austenite volume content of plate；
C, interruption one directional tensile test is carried out to sample under different strain rate, corresponding sample central point when measuring differently strained
Retained austenite volume content；
D, the examination that different strain rate list is drawn the lower equivalent plastic strain and corresponding retained austenite volume content for determining of experiment
The parameter item of the formula that data fit procedure A is derived is tested, query graph is drawn based on the expression formula set up；
The expression formula is：Wherein,It is strain rate,It is to refer to strain rate, εPIt is equivalent plastic strain, fγIt is in strain rateUnder the conditions of simple tension to equivalent modeling
Property strain stressPCorresponding instantaneous retained austenite volume content；
E, measurement draw the equivalent plastic strain after Q＆P steel plate materials simple tension deformation, with reference to the expression formula or query graph
Can quantitative forecast Q＆P steel plate materials retained austenite volume content after different strain rate simple tension.
2. Q＆P steel according to claim 1 is in the Forecasting Methodology of different strain rate Dan Lahou residual austenite contents, and it is special
Levy and be, the step C is specially：By sample, different strain rate carries out simple tension at room temperature, is loaded into default strain, so
The retained austenite volume content of sample central point is unloaded and measured afterwards.
3. Q＆P steel according to claim 1 is in the Forecasting Methodology of different strain rate Dan Lahou residual austenite contents, and it is special
Levy and be, in step D, the query graph is according to retained austenite volume content, correspondence equivalent plastic strain after deformation and answers
The three-dimensional query graph that variability is drawn.
4. Q＆P steel according to claim 1 is in the Forecasting Methodology of different strain rate Dan Lahou residual austenite contents, and it is special
Levy and be, in step D, the query graph is that, by the equivalent line projection of retained austenite volume content, the two dimension being made is looked into
Ask figure.
5. Q＆P steel according to claim 1 is in the Forecasting Methodology of different strain rate Dan Lahou residual austenite contents, and it is special
Levy and be, in step D, the measurement of the equivalent plastic strain is using contact extensometer, non-contact type extensometer, grid measurement
Method or Digital image technology are carried out.
6. Q＆P steel according to claim 5 is in the Forecasting Methodology of different strain rate Dan Lahou residual austenite contents, and it is special
Levy and be, the grid mensuration is specially：Roundness mess is printed on Q＆P steel plate material samples, by measuring sample after deformation
The change of upper grid can obtain primary and secondary strain, then according to constancy of volume principle, i.e. ε1+ε2+ε3=0, can obtain three masters in direction
Strain stress1、ε2、ε3, can then converse corresponding equivalent plastic strain.
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| US20100136369A1 (en) * | 2008-11-18 | 2010-06-03 | Raghavan Ayer | High strength and toughness steel structures by friction stir welding |
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| CN1246161A (en) * | 1997-01-29 | 2000-03-01 | 新日本制铁株式会社 | High-strength steel sheet highly resistant to dynamic deformation and excellent in workability and process for production thereof |
| EP2314729A1 (en) * | 1997-03-17 | 2011-04-27 | Nippon Steel Corporation | Dual-phase type high-strength steel sheets having high impact energy absorption properties and a method of producing the same |
| CN1514885A (en) * | 2001-06-11 | 2004-07-21 | �����Ƹ���ʽ���� | Double phase stainless steel strip for steel belt |
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