CN103323471A - Quantitative prediction method of retained austenite transformation in incremental forming process of TRIP steel plate material - Google Patents
Quantitative prediction method of retained austenite transformation in incremental forming process of TRIP steel plate material Download PDFInfo
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Abstract
The invention discloses a quantitative prediction method of retained austenite transformation in the incremental forming process of a TRIP steel plate material. The method comprises the following steps: drawing an arc curve through computer three-dimensional modeling software, assigning the arc curve as a processing locus, generating a processing program, shaping an arc groove, utilizing grid strain measure analysis to obtain the largest principal strain and the smallest principal strain of a plate plane, measuring the retained austenite contents of corresponding strain positions, fitting the relation between the retained austenite contents determined in different strain states and the corresponding equivalent strains, establishing a corresponding expression formula, and finally establishing a coordinate system to obtain the retained austenite transformation contour map in the incremental forming process of the TRIP steel plate material in order to realize the rapid quantitative prediction of the retained austenite transformation amounts of the corresponding positions. The method provides a basis for the reasonable making of a production technology.
Description
Technical field
The invention belongs to metal material forming technique field, be specifically related to the method that a kind of TRIP steel plate material progressive molding process retained austenite changes quantitative forecast.
Background technology
The numerical control progressive molding has the advantages such as product that cost is low, plastic force is little, the sheet forming performance is good, suitable shaping form is complicated and a punching press is difficult to be shaped, be particularly suitable for the production of new product development and single-piece or short run sheet metal part, therefore, obtained increasing concern and research, this manufacturing process is with a wide range of applications in industries such as Aeronautics and Astronautics, household electrical appliances, medicine equipment and automobile makings.
TRIP steel (being phase change induction plasticity steel) room temperature undertissue is generally ferrite, bainite and retained austenite, inner retained austenite can (be the phase change induction plasticity effect to martensite transfor mation in forming process, be called for short the TRIP effect), this transformation makes the TRIP steel possess the high-intensity while, also has good plasticity.For the distortion potentiality that guarantee that part is follow-up, need control the transformation amount of retained austenite in the deformation process, therefore need the transformation of the inner retained austenite of TRIP steel plate material in the quantitative forecast forming process, for technological design provides foundation, in order to give full play to the plasticity of TRIP.The transformation of the inner retained austenite of TRIP steel significantly is subjected to the influence of deformation process strain regime and dependent variable, prior art, for the austenitic transformation of prediction residue in the TRIP steel drift pressure, need to consider the influence of deformation state, set up corresponding kinetic model, predict that in conjunction with numerical simulation process is comparatively complicated.
Summary of the invention
In order to overcome the above-mentioned technical matters that the prior art field exists, the objective of the invention is to, provide a kind of TRIP steel plate material progressive molding process retained austenite to change quantitative forecasting technique, the transformation amount of the retained austenite of different parts in the quantitative forecast TRIP steel plate material progressive molding comparatively accurately and rapidly.
TRIP steel plate material progressive molding process retained austenite provided by the invention changes quantitative forecasting technique, may further comprise the steps:
One, use the Computerized three-dimensional modeling software in same vertical coordinate plane, to draw reciprocal circular curve, and the reciprocal circular curve that will draw is appointed as machining locus, generation arc groove job sequence;
Two, use the Computerized three-dimensional modeling software in orthogonal coordinate plane, to draw circular curve respectively, circular curve in the orthogonal coordinate plane is alternately connected, form single-pathway, and the circular curve of drawing is appointed as machining locus, generate intersection circular arc groove processing program;
Three, prepare sample: prepare some TRIP steel plate samples, and TRIP steel plate specimen surface is cleaned out, print cylinder lattice clearly at TRIP steel plate specimen surface afterwards, standby;
Four, the TRIP steel plate sample of getting ready is fixed, choose the hemispherical head forming tool, the arc groove job sequence that adopts step 1 to generate, at the unidirectional arc groove of TRIP steel plate sample shaping, reaching the preassigned shaping degree of depth stops, measure the grid of the unidirectional arc groove bottommost that is shaped, analyze acquisition board plane maximum principal strain and the minimum principal strain of board plane by the grid strain measurement, and pass through X-ray diffractometer, measure the residual austenite content of unidirectional arc groove lowest position, afterwards, aforesaid operations is repeated to specify the different shaping degree of depth more than 3 times at every turn;
Five, the TRIP steel plate sample of getting ready is fixed, choose the hemispherical head forming tool, the intersection circular arc groove processing program that adopts step 2 to generate, at the wide intersection arc groove of TRIP steel plate sample shaping, reaching the preassigned shaping degree of depth stops, measure the grid of the wide intersection arc groove bottommost that is shaped, analyze acquisition board plane maximum principal strain and the minimum principal strain of board plane by the grid strain measurement, and pass through X-ray diffractometer, measure the residual austenite content of wide intersection arc groove lowest position, afterwards, aforesaid operations is repeated to specify the different shaping degree of depth more than 3 times at every turn;
Six, the TRIP steel plate sample of getting ready is fixed, choose ellipsoid head forming tool, the intersection circular arc groove processing program that adopts step 2 to generate, at the non-wide intersection arc groove of TRIP steel plate sample shaping, reaching the preassigned shaping degree of depth stops, measure the grid of the non-wide intersection arc groove bottommost that is shaped, analyze acquisition board plane maximum principal strain and the minimum principal strain of board plane by the grid strain measurement, and pass through X-ray diffractometer, measure the residual austenite content of non-wide intersection arc groove lowest position, afterwards, aforesaid operations is repeated to specify the different shaping degree of depth more than 3 times at every turn;
Seven, choose the different ellipsoid head forming tool of major and minor axis ratio and be no less than 3, each ellipsoid head forming tool repeats the operation of step 6 to specify the different shaping degree of depth more than 3 times respectively at every turn;
Eight, adopt formula
Calculation procedure four is to step 7, and under the strain conditions, the equivalent strain of different depressing positions, in the formula, ε 1, ε 2 are respectively board plane maximum principal strain and the minimum principal strain of board plane, and ε 3 is thick in principal strain, and ε
1+ ε
2+ ε
3=0;
Nine, according to step 4 to step 7, the residual austenite content of measuring under the match strain conditions and the relation of corresponding equivalent strain are set up corresponding expression formula, according to expression formula calculate respectively residual austenite content for the distortion before initial residual austenite V
0Content 90%, 80%, 70%, 60%, 50%, 40%, 50%, 40%, 30%, 20% and 10% corresponding equivalent strain amount, afterwards, according to formula:
Ten, set up strain coordinate system, ordinate display plate plane maximum principal strain ε 1, the minimum principal strain ε 2 in horizontal ordinate display plate plane, respectively with under the strain conditions, different retained austenite transformation measures the minimum principal strain of corresponding board plane maximum principal strain and board plane and marks and draws in coordinate system, the coordinate points of the board plane maximum principal strain that the remained austenite content under the connection strain conditions is identical and the minimum principal strain correspondence of board plane can obtain TRIP steel plate material progressive molding retained austenite and change isogram;
11, the TRIP steel plate material is carried out progressive molding before, can obtain the corresponding board plane maximum principal strain in optional position and the minimum principal strain of board plane by numerical simulation, coordinate points by the minimum principal strain correspondence of board plane maximum principal strain and board plane drops on retained austenite and changes position in the isogram, retained austenite transformation amount that can fast quantification prediction correspondence position.
Above-mentioned steps four is to step 7, and at the arc groove that TRIP steel plate sample is shaped, channel bottom does not produce and breaks; Describedly print cylinder lattice clearly at TRIP steel plate specimen surface, the cylinder lattice adopt electrocorrosion method or printing ink method for printing to print.
TRIP steel plate material progressive molding process retained austenite provided by the invention changes quantitative forecasting technique, its beneficial effect is, by setting up TRIP steel progressive molding retained austenite isogram, in conjunction with numerical simulation or progressive molding plate distortion of the mesh test, can be fast, the retained austenite transformation amount of quantitative forecast plate diverse location, provide foundation for rationally formulating production technology.
Description of drawings
Fig. 1 is unidirectional arc groove movement locus synoptic diagram for the hemispherical head forming tool is shaped;
Fig. 2 is wide intersection arc groove movement locus synoptic diagram for the hemispherical head forming tool is shaped;
Fig. 3 is ellipsoid head forming tool synoptic diagram;
Fig. 4 is unidirectional arc groove schematic top plan view;
Fig. 5 is non-wide intersection arc groove schematic top plan view;
Fig. 6 is wide intersection arc groove schematic top plan view;
Fig. 7 is that TRIP steel progressive molding retained austenite changes isogram.
Mark among the figure:
1. hemispherical head forming tool; 2. ellipsoid head forming tool; 3.TRIP steel plate sample; 4. unidirectional arc groove; 5. non-wide intersection arc groove; 6. wide intersection arc groove.
Embodiment
With reference to the accompanying drawings, in conjunction with an embodiment, TRIP steel plate material progressive molding process retained austenite provided by the invention is changed quantitative forecasting technique be described in detail.
Embodiment
With reference to Fig. 1-Fig. 7, the TRIP steel plate material progressive molding process retained austenite of present embodiment changes quantitative forecasting technique, is that the TRIP590 steel plate of 1mm is example with thickness, describes.
One, as Fig. 1, adopt UG NX8.0 graphics software grass in the Y-Z plane to paint reciprocal circular curve, initial arc diameter is 120mm, adjacent arc diameter increases 0.2mm, final arc diameter is 150mm, adopt " curve/point " driving in " fixedly profile mills " in " processing " module, specifying the reciprocal circular curve of drawing is the machining locus of machining tool, generates unidirectional arc groove job sequence;
Two, as Fig. 2, adopt UG NX8.0 graphics software, grass is painted circular curve in Y-Z plane and X-Z plane respectively, alternately connect the circular curve in each plane afterwards, form single machining path, " curve/point " driving in " fixedly profile mills " in employing " processing " module, specifying the circular curve of drawing is the machining locus of machining tool, generates intersection circular arc groove processing program;
Three, choose 20 on TRIP steel plate sample, adopting the electrocorrosion method to print diameter TRIP steel plate specimen surface is the circular grid of 2mm;
Four, the TRIP steel plate sample of getting ready 3 is fixed on the progressive molding machine, choosing diameter is the hemispherical head forming tool 1 of 6mm, the unidirectional arc groove job sequence shaping TRIP steel plate sample that adopts step 1 to generate, unidirectional arc groove 4 is as shown in Figure 4 overlooked in acquisition, according to said method, be formed separately the unidirectional arc groove of 4 kinds of different depths, guarantee in the forming process that the unidirectional arc groove sunk part of formed thereby does not break; The change in size of each the unidirectional arc groove bottom position initial mesh that measure to be shaped afterwards, according to formula:
Five, the TRIP steel plate sample of getting ready 3 is fixed on the progressive molding machine, choosing diameter is the hemispherical head forming tool 1 of 6mm, the intersection circular arc groove processing program shaping TRIP steel plate sample that adopts step 2 to generate, wide intersection arc groove 6 is as shown in Figure 6 overlooked in acquisition, according to said method, be formed separately the wide intersection arc groove of 4 kinds of different depths, guarantee that in forming process the wide intersection circular arc grooves recess part of formed thereby is not broken; The change in size of each the wide intersection circular arc channel bottom position initial mesh that measure to be shaped afterwards, according to formula:
Six, the TRIP steel plate sample of getting ready 3 is fixed on the progressive molding machine, adopting major axis respectively is 9mm, minor axis is 6mm, major axis is 12mm, minor axis is that 6mm and major axis are 18mm, minor axis is the ellipsoid head forming tool 2 of 6mm, the intersection circular arc groove processing program shaping TRIP steel plate sample that adopts step 2 to generate, guarantee ellipsoid head forming tool long shaft plane in the forming process, short axis plane respectively with X-Z plane and Y-Z planes overlapping, non-wide intersection arc groove 5 is as shown in Figure 5 overlooked in acquisition, three kinds of ellipsoid head forming tools that the major and minor axis ratio is different, according to said method, be formed separately the non-wide intersection arc groove of 4 kinds of different depths, guarantee that in forming process the non-wide intersection circular arc grooves recess part of formed thereby is not broken; The change in size of each the non-wide intersection circular arc channel bottom position initial mesh that measure to be shaped afterwards, according to formula:
Seven, according to formula:
ε
3For thick to principal strain, and ε
1+ ε
2+ ε
3=0, calculate the equivalent strain of different depressing positions under the strain conditions, afterwards, fit the residual austenite content measured under the strain conditions and the relation of corresponding equivalent strain, set up corresponding expression formula, calculate residual austenite content respectively according to expression formula and be the preceding initial residual austenite V of distortion
0Content 90%, 80%, 70%, 60%, 50%, 40%, 50%, 40%, 30%, 20% and 10% corresponding equivalent strain amount, afterwards according to formula:
The corresponding board plane maximum principal strain of difference each equivalent strain of backwards calculation ε
1With the minimum principal strain ε of board plane
2
Eight, set up strain coordinate system, ordinate display plate plane maximum principal strain ε 1, the minimum principal strain ε 2 in horizontal ordinate display plate plane, respectively with under the strain conditions, different retained austenite transformation measures the minimum principal strain of corresponding board plane maximum principal strain and board plane and marks and draws in coordinate system, the coordinate points of the board plane maximum principal strain that the remained austenite content under the connection strain conditions is identical and the minimum principal strain correspondence of board plane can obtain TRIP steel plate material progressive molding retained austenite and change isogram;
Nine, the TRIP steel plate material is carried out progressive molding before, can obtain the corresponding board plane maximum principal strain in optional position and the minimum principal strain of board plane by numerical simulation, coordinate points by the minimum principal strain correspondence of board plane maximum principal strain and board plane drops on retained austenite and changes position in the isogram, retained austenite transformation amount that can fast quantification prediction correspondence position.
Claims (3)
1. a TRIP steel plate material progressive molding process retained austenite changes quantitative forecasting technique, it is characterized in that: said method comprising the steps of:
One, use the Computerized three-dimensional modeling software in same vertical coordinate plane, to draw reciprocal circular curve, and the reciprocal circular curve that will draw is appointed as machining locus, generation arc groove job sequence;
Two, use the Computerized three-dimensional modeling software in orthogonal coordinate plane, to draw circular curve respectively, circular curve in the orthogonal coordinate plane is alternately connected, form single-pathway, and the circular curve of drawing is appointed as machining locus, generate intersection circular arc groove processing program;
Three, prepare sample: prepare some TRIP steel plate samples, and TRIP steel plate specimen surface is cleaned out, print cylinder lattice clearly at TRIP steel plate specimen surface afterwards, standby;
Four, the TRIP steel plate sample of getting ready is fixed, choose the hemispherical head forming tool, the arc groove job sequence that adopts step 1 to generate, at the unidirectional arc groove of TRIP steel plate sample shaping, reaching the preassigned shaping degree of depth stops, measure the grid of the unidirectional arc groove bottommost that is shaped, analyze acquisition board plane maximum principal strain and the minimum principal strain of board plane by the grid strain measurement, and pass through X-ray diffractometer, measure the residual austenite content of unidirectional arc groove lowest position, afterwards, aforesaid operations is repeated to specify the different shaping degree of depth more than 3 times at every turn;
Five, the TRIP steel plate sample of getting ready is fixed, choose the hemispherical head forming tool, the intersection circular arc groove processing program that adopts step 2 to generate, at the wide intersection arc groove of TRIP steel plate sample shaping, reaching the preassigned shaping degree of depth stops, measure the grid of the wide intersection arc groove bottommost that is shaped, analyze acquisition board plane maximum principal strain and the minimum principal strain of board plane by the grid strain measurement, and pass through X-ray diffractometer, measure the residual austenite content of wide intersection arc groove lowest position, afterwards, aforesaid operations is repeated to specify the different shaping degree of depth more than 3 times at every turn;
Six, the TRIP steel plate sample of getting ready is fixed, choose ellipsoid head forming tool, the intersection circular arc groove processing program that adopts step 2 to generate, at the non-wide intersection arc groove of TRIP steel plate sample shaping, reaching the preassigned shaping degree of depth stops, measure the grid of the non-wide intersection arc groove bottommost that is shaped, analyze acquisition board plane maximum principal strain and the minimum principal strain of board plane by the grid strain measurement, and pass through X-ray diffractometer, measure the residual austenite content of non-wide intersection arc groove lowest position, afterwards, aforesaid operations is repeated to specify the different shaping degree of depth more than 3 times at every turn;
Seven, choose the different ellipsoid head forming tool of major and minor axis ratio and be no less than 3, each ellipsoid head forming tool repeats the operation of step 6 to specify the different shaping degree of depth more than 3 times respectively at every turn;
Eight, adopt formula
Calculation procedure four is to step 7, and under the strain conditions, the equivalent strain of different depressing positions, in the formula, ε 1, ε 2 are respectively board plane maximum principal strain and the minimum principal strain of board plane, and ε 3 is thick in principal strain, and ε
1+ ε
2+ ε
3=0;
Nine, according to step 4 to step 7, the residual austenite content of measuring under the match strain conditions and the relation of corresponding equivalent strain are set up corresponding expression formula, according to expression formula calculate respectively residual austenite content for the distortion before initial residual austenite V
0Content 90%, 80%, 70%, 60%, 50%, 40%, 50%, 40%, 30%, 20% and 10% corresponding equivalent strain amount, afterwards, according to formula:
The minimum principal strain of the difference corresponding board plane maximum principal strain of each equivalent strain of backwards calculation and board plane;
Ten, set up strain coordinate system, ordinate display plate plane maximum principal strain ε 1, the minimum principal strain ε 2 in horizontal ordinate display plate plane, respectively with under the strain conditions, different retained austenite transformation measures the minimum principal strain of corresponding board plane maximum principal strain and board plane and marks and draws in coordinate system, the coordinate points of the board plane maximum principal strain that the remained austenite content under the connection strain conditions is identical and the minimum principal strain correspondence of board plane can obtain TRIP steel plate material progressive molding retained austenite and change isogram;
11, the TRIP steel plate material is carried out progressive molding before, can obtain the corresponding board plane maximum principal strain in optional position and the minimum principal strain of board plane by numerical simulation, coordinate points by the minimum principal strain correspondence of board plane maximum principal strain and board plane drops on retained austenite and changes position in the isogram, retained austenite transformation amount that can fast quantification prediction correspondence position.
2. TRIP steel plate material progressive molding process retained austenite according to claim 1 changes quantitative forecasting technique, and it is characterized in that: step 4 is to step 7, and at the arc groove that TRIP steel plate sample is shaped, channel bottom does not produce and breaks.
3. TRIP steel plate material progressive molding process retained austenite according to claim 1 changes quantitative forecasting technique, it is characterized in that: describedly print cylinder lattice clearly at TRIP steel plate specimen surface, the cylinder lattice adopt electrocorrosion method or printing ink method for printing to print.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950130A (en) * | 2017-04-21 | 2017-07-14 | 上海交通大学 | A kind of method of austenite content after prediction TRIP type high-strength steel fatigue fractures |
| CN108398329A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A method of autobody sheet application performance is differentiated to reduction based on thickness |
| CN109543333A (en) * | 2018-12-02 | 2019-03-29 | 湖南大学 | The welding residual stress of nuclear power engineering six angle pipes and the prediction technique of deformation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398329A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A method of autobody sheet application performance is differentiated to reduction based on thickness |
| CN106950130A (en) * | 2017-04-21 | 2017-07-14 | 上海交通大学 | A kind of method of austenite content after prediction TRIP type high-strength steel fatigue fractures |
| CN106950130B (en) * | 2017-04-21 | 2020-05-22 | 上海交通大学 | Method for predicting austenite content of TRIP type high-strength steel after fatigue fracture |
| CN109543333A (en) * | 2018-12-02 | 2019-03-29 | 湖南大学 | The welding residual stress of nuclear power engineering six angle pipes and the prediction technique of deformation |
| CN109543333B (en) * | 2018-12-02 | 2022-02-22 | 湖南大学 | Method for predicting welding residual stress and deformation of hexagonal tube for nuclear power engineering |
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