CN101306429B - Preparation method of micron and sub-micron austenite crystal material - Google Patents
Preparation method of micron and sub-micron austenite crystal material Download PDFInfo
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- CN101306429B CN101306429B CN2008100120262A CN200810012026A CN101306429B CN 101306429 B CN101306429 B CN 101306429B CN 2008100120262 A CN2008100120262 A CN 2008100120262A CN 200810012026 A CN200810012026 A CN 200810012026A CN 101306429 B CN101306429 B CN 101306429B
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Abstract
A method for preparing austenite crystal material on micron and submicron scales comprises the following steps: (1) smelting the low carbon steel, casting into the ingot blank, then rolling into the hot rolling slab and air-cooling to the room temperature; (2) heating the hot rolling slab to the temperature of 500 DEG C, holding for 1-2 hours, rolling for 5-10 passes with the accumulated rolling reduction being 70%-90% and obtaining the warm rolling slab; and (3) adopting the thermal simulation specimen of the warm rolling slab machining to heat to the temperature of 700-800 DEG C at a speed of 20-100 DEG C/s by the thermo-dynamic simulator, deforming by 32%-80% along the direction perpendicular to or parallel to the warm rolling, and then heating to 900 DEG C, holding for 1s and obtaining the austenite grain with the size of 3-0.3 Mum. The method has relatively simple process and higher operability, and the method can be realized in the prior rolling production line, thereby the prospect of industrial application is promising.
Description
Technical field
The invention belongs to materials science field, be specifically related to the preparation method of a kind of micron and sub-micron austenite crystal material.
Background technology
Super fine crystal material becomes a focus in investigation of materials field, various countries owing to have the distinctive comprehensive advantage of intensity and plasticity aspect.For traditional ferrous materials, the research of relevant its grain ultrafining is also in extensive and deep expansion.Till now, grain refinement to ferrous materials is also goed deep into as copper, aluminium etc. to Nano grade as other non-ferrous metals, but owing to be subjected to the restriction of problems such as capacity of equipment such as milling train or process complexity own, make as the cold rolling annealing again of martensite, wait passage extruding (ECAP) and accumulative total ply rolling (ARB) to wait to realize the nanocrystalline steel etc. need be than the big heavy discount of extensive use of the superfining process of low temperature deformation amount greatly; And consider from the angle of practical application and industrialization promotion, with the process of grain refinement to the 1～10 μ m of the ferrous materials still main flow in all crystal grains thinning method all the time, wherein the most typical and effectively surely belong to TMCP, i.e. controlled rolling and control process for cooling.Why TMCP becomes a kind of efficient ways in numerous technologies, its main cause is that this technology is by γ → α phase transition process is controlled, can guarantee that required technological parameter is within the scope that modern rolling line can provide, even such as utilizing TMCP to need bigger deflection, but owing to can regulate deformation temperature simultaneously, rate of deformation and middle cooling wait other correlative factors to make distortion be in higher relatively temperature province, and can finally guarantee the performance requirement of product, so just increased the popularity of its application greatly, usually in the TMCP technology that industrial circle is used austenite grain size tens and even micron up to a hundred.
In view of above-mentioned comparative analysis, also there are most researchs that thinking is transferred to by improving traditional TMCP process, thereby obtain to have the thin brilliant thinking in good anti-exhibition space, the many people of these improved methods are referred to as Advancedthermomechanical process.Utilize these methods can be with the grain refinement of ferrous materials to sub-micron (＜1 μ m) scope, also include in these methods certainly by the control austenite crystal and obtain the final state structure refinement, wherein the thinnest austenite crystal be about 10 μ m.
The original austenite grains feature is directly connected in the cooling procedure its characteristics of decomposition and then influences microstructure after phase transformation and performance, therefore austenite crystal is controlled just to seem very crucial in the technology of utilizing austenite cooling procedure phase transformation refinement final state tissue.Usually the original austenite grains size is more little, identical cooling phase-change condition is following obtain finally to organize thin more, to people such as this Yang Wang Yue utilize size the austenite crystal of 44～7 μ m comparatively system analysis austenite grain size find during to the influencing of final state tissue, under the same deformation and cooling condition, austenite crystal is more little, the ferrite content of follow-up phase transformation gained is many more, and is evenly distributed.But consider the process characteristic of actual Rolling Production, the austenite crystal that most of research work is adopted is generally about tens microns.Transformation behavior for studying about austenite crystal refinement 1 μ m even after the sub-micron rank in its cooling procedure does not also appear in the newspapers so far as yet.
Simple consideration Refinement Technology of Austenite Grains also had a large amount of bibliographical informations, just utilized the control of distortion and mode of heating that the steel alloy austenite crystal is refine near 0.1～0.3 μ m as far back as phase at beginning of the eighties in last century people.In recent years, Ri Ben researcher refine to the austenite crystal of middle low carbon steel below the 3 μ m.
Summary of the invention
At the problem on the prior art, the invention provides the preparation method of a kind of micron and sub-micron austenite crystal material.
Technical scheme of the present invention is:
(1) setting of mild steel chemical composition and smelting, casting: the chemical composition of the mild steel that sets has two kinds: the chemical composition percentage by weight of first kind of mild steel is for containing C 0.10～0.20%, Si 0.1～1.5%, Mn 1.0～2.0%, P≤0.01%, S≤0.01%, Nb 0.02～0.05%, and all the other are Fe; The chemical composition percentage by weight of second kind of mild steel is for containing C 0.10～0.20%, and Si 0.1～1.5%, and Mn 1.0～2.0%, P≤0.01%, S≤0.01%, Nb 0.02～0.05%, V 0.05～0.07%, and Ti 0.02～0.05%, and all the other are Fe.By the composition of above-mentioned setting with this mild steel through smelting, be cast into strand.
(2) with one of above-mentioned constituent or two steel strand be heated to 1200 ℃ of insulation 2h after, be rolled into hot rolling slab, air cooling makes it to have ferrite/pearlitic structrure to room temperature.
(3) hot rolling slab behind the air cooling is heated to 500 ℃ of insulation 1～2h after, it is rolling to carry out 5～10 passages, the accumulative total drafts is 70%～90%, obtains the warm-rolling slab.
(4) utilize warm-rolling slab processing thermal simulation sample, speed with 20～100 ℃/s in Re-Li simulation test machine is heated to 700～800 ℃, then along vertical warm-rolling rolling direction or parallel warm-rolling rolling direction distortion 32%～80%, speed with 100 ℃/s is warming up to 900 ℃ afterwards, insulation 1s, obtaining austenite grain size is 0.3～3 μ m.
The preparation method of micron of the present invention and sub-micron austenite crystal material, with the mild steel that contains little niobium or little niobium, vanadium, titanium is basis, can under the prerequisite that reduces the alloying element consumption as far as possible, realize the crystal grain micronization and the sub-micronization of high temperature austenite, and can realize the optimization of final state tissue effectively in conjunction with the control of the transformation behavior in the cooling procedure; Technology of the present invention is simple relatively, and operability is stronger, can obtain to realize that prospects for commercial application is better on existing rolling line.
Description of drawings:
Fig. 1 is that the sub-micron austenite crystal material of 0.5 μ m quenches behind 900 ℃ of insulation 1s for the average grain size that adopts the inventive method to obtain, the optical microscopy map that obtains through erosion.
Fig. 2 quenches behind 900 ℃ of insulation 1s at the sub-micron austenite crystal material of 0.8 μ m for the average grain size that adopts the inventive method and obtain, the optical microscopy map that obtains through erosion.
Fig. 3 is that the micron order austenite crystal material of 3 μ m quenches behind 900 ℃ of insulation 1s for the average grain size that adopts the inventive method to obtain, the optical microscopy map that obtains through erosion.
The specific embodiment:
Embodiment 1
The chemical composition percentage by weight of the mild steel of setting is for containing C 0.12%, and Si 0.13%, Mn1.30%, and P 0.015%, and S 0.007%, and Nb 0.02%, and all the other are Fe; This mild steel is smelted in the 50Kg vaccum sensitive stove, be cast into the cylindrical billet of φ 150mm * 500mm; Strand is placed in the high temperature resistance furnace, be heated to 1200 ℃ of insulation 2h after, on laboratory φ 450 milling trains, be rolled into the hot rolling slab of thick 40mm through 8 passages, air cooling makes it to have ferrite/pearlitic structrure to room temperature.After hot rolling slab is heated to 500 ℃ of insulation 1h, rolling through 6 passages on φ 300 milling trains, accumulative total drafts 80%, obtaining slab thickness is the warm-rolling slab of 8mm.
Utilize lathe and line to be cut into the cylindrical thermal simulation sample of φ 6 * 12mm the warm-rolling slab, place Gleeble1500 Re-Li simulation test machine then, be heated to 800 ℃ with the speed of 20 ℃/s, then with 0.1s
-1Strain rate distortion 32%, deformation direction is perpendicular to warm-rolling rolling direction; Speed with 100 ℃/s is warming up to 900 ℃ subsequently, and insulation 1s obtains the sub-micron austenite crystal material of average grain size at 0.5 μ m.
Fig. 1 is for quenching behind 900 ℃ of insulation 1s, and the average grain size that obtains through erosion is the optical microscopy map of the sub-micron austenite crystal material of 0.5 μ m.
Embodiment 2
The chemical composition percentage by weight of the mild steel of setting is for containing C 0.16%, and Si 1.38%, Mn1.80%, and P 0.008%, and S 0.006%, and Nb 0.05%, and V 0.06%, and Ti 0.03%, and all the other are Fe; This mild steel is smelted in the 50Kg vaccum sensitive stove, be cast into the cylindrical billet of φ 150mm * 500mm.Strand is placed in the high temperature resistance furnace, be heated to 1200 ℃ of insulation 2h after, on laboratory φ 450 milling trains, be rolled into the hot rolling slab of thick 40mm through 8 passages, air cooling makes it to have ferrite/pearlitic structrure to room temperature.After hot rolling slab is heated to 500 ℃ of insulation 1.5h, rolling through 6 passages on φ 300 milling trains, accumulative total drafts 80%, obtaining thickness is the warm-rolling slab of 8mm.
Utilize lathe and line to be cut into the cylindrical thermal simulation sample of φ 6 * 12mm the warm-rolling slab, place Gleeble1500 Re-Li simulation test machine then, be heated to 800 ℃ with the speed of 20 ℃/s after with 0.1s
-1Strain rate distortion 55%, deformation direction is perpendicular to warm-rolling rolling direction; Speed with 100 ℃/s is warming up to 900 ℃ subsequently, insulation 1s.Obtain the sub-micron austenite crystal material of average grain size at 0.8 μ m.
Fig. 2 is for quenching behind 900 ℃ of insulation 1s, and the average grain size that obtains through erosion is the optical microscopy map of the sub-micron austenite crystal material of 0.8 μ m.
Embodiment 3
The chemical composition percentage by weight of the mild steel of setting is for containing C 0.16%, and Si 1.38%, Mn1.80%, and P 0.008%, and S 0.006%, and Nb 0.05%, and V 0.06%, contains Ti 0.03%, and all the other are Fe; This mild steel is smelted in the 50Kg vaccum sensitive stove, be cast into the cylindrical billet of φ 150mm * 500mm.Strand is placed in the high temperature resistance furnace, be heated to 1200 ℃ of insulation 2h after, on laboratory φ 450 milling trains, be rolled into the hot rolling slab of thick 50mm through 8 passages, air cooling makes it to have ferrite/pearlitic structrure to room temperature.After hot rolling slab is heated to 500 ℃ of insulation 2h, rolling through 10 passages on φ 450 milling trains, accumulative total drafts 72%, obtaining thickness is the warm-rolling slab of 14mm.
Utilize lathe and line to be cut into the cylindrical thermal simulation sample of φ 6 * 12mm the warm-rolling slab, place Gleeble1500 Re-Li simulation test machine then, be heated to 800 ℃ with the speed of 100 ℃/s after with 0.1s
-1Strain rate distortion 55%, deformation direction is perpendicular to warm-rolling rolling direction; Speed with 100 ℃/s is warming up to 900 ℃ subsequently, and insulation 1s obtains the micron order austenite crystal material of average grain size at 2 μ m.
Fig. 2 is for quenching behind 900 ℃ of insulation 1s, and the average grain size that obtains through erosion is the optical microscopy map of the micron order austenite crystal material of 3 μ m.
Embodiment 4
The chemical composition percentage by weight of the mild steel of setting is for containing C 0.12%, and Si 0.13%, Mn1.30%, and P 0.015%, and S 0.007%, and Nb 0.02%, and all the other are Fe; This mild steel is smelted in the 50Kg vaccum sensitive stove, be cast into the cylindrical billet of φ 150mm * 500mm.Strand is placed in the high temperature resistance furnace, be heated to 1200 ℃ of insulation 2h after, on laboratory φ 450 milling trains, be rolled into the hot rolling slab of thick 50mm through 8 passages, air cooling makes it to have ferrite/pearlitic structrure to room temperature.After hot rolling slab is heated to 500 ℃ of insulation 1h, rolling through 5 passages on φ 450 milling trains, accumulative total drafts 70%, obtaining thickness is the warm-rolling slab of 15mm.
Utilize lathe and line to be cut into the cylindrical thermal simulation sample of φ 6 * 12mm the warm-rolling slab, place Gleeble1500 Re-Li simulation test machine then, be heated to 700 ℃ with the speed of 40 ℃/s after with 1s
-1Strain rate distortion 40%, deformation direction is perpendicular to warm-rolling rolling direction; Speed with 100 ℃/s is warming up to 900 ℃ subsequently, and insulation 1s obtains the micron order austenite crystal material of average grain size at 3 μ m.
Embodiment 5
The chemical composition percentage by weight of the mild steel of setting is for containing C 0.16%, and Si 1.38%, Mn1.80%, and P 0.008%, and S 0.006%, and Nb 0.05%, and V 0.06%, and Ti 0.03%, and all the other are Fe; This mild steel is smelted in the 50Kg vaccum sensitive stove, be cast into the cylindrical billet of φ 150mm * 500mm.Strand is placed in the high temperature resistance furnace, be heated to 1200 ℃ of insulation 2h after, on laboratory φ 450 milling trains, be rolled into the hot rolling slab of thick 50mm through 8 passages, air cooling makes it to have ferrite/pearlitic structrure to room temperature.After hot rolling slab is heated to 500 ℃ of insulation 2h, rolling through 10 passages on φ 300 milling trains, accumulative total drafts 90%, obtaining thickness is the warm-rolling slab of 5mm.
Utilize lathe and line to be cut into the cylindrical thermal simulation sample of φ 6 * 12mm the warm-rolling slab, place Gleeble1500 Re-Li simulation test machine then, be heated to 800 ℃ with the speed of 60 ℃/s after with 10s
-1Strain rate distortion 80%, deformation direction is parallel to warm-rolling rolling direction; Speed with 100 ℃/s is warming up to 900 ℃ subsequently, and insulation 1s obtains the sub-micron austenite crystal material of average grain size at 0.3 μ m.
Claims (2)
1. the preparation method of micron and sub-micron austenite crystal material, specifically may further comprise the steps: (1) is set the chemical composition of mild steel and is smelted, and is cast into strand; Be rolled into hot rolling slab then, air cooling is to room temperature; (2) hot rolling slab behind the air cooling is heated to 500 ℃ of insulation 1～2h after, it is rolling to carry out 5～10 passages, the accumulative total drafts is 70%～90%, obtains the warm-rolling slab; (3) utilize warm-rolling slab processing thermal simulation sample, be heated to 700～800 ℃ by Re-Li simulation test machine with the speed of 20～100 ℃/s,, be warming up to 900 ℃ afterwards along vertical warm-rolling rolling direction or parallel warm-rolling rolling direction distortion 32%～80%, insulation 1s obtains austenite crystal; The mild steel chemical composition of described setting is two kinds: the chemical composition percentage by weight of first kind of mild steel is for containing C 0.10～0.20%, and Si 0.1～1.5%, and Mn 1.0～2.0%, P≤0.01%, S≤0.01%, Nb 0.02～0.05%, and all the other are Fe; The chemical composition percentage by weight of second kind of mild steel is for containing C 0.10～0.20%, Si0.1～1.5%, and Mn 1.0～2.0%, P≤0.01%, S≤0.01%, Nb 0.02～0.05%, and V 0.05～0.07%, Ti0.02～0.05%, all the other are Fe; Described austenite grain size is controlled at 3～0.3 μ m; The described distortion in Re-Li simulation test machine is with 0.1～10s
-1Strain rate distortion, the speed with 100 ℃/s is warming up to 900 ℃ then.
2. the preparation method of a kind of micron according to claim 1 and sub-micron austenite crystal material is characterized in that described hot rolling slab is that the casting steel billet is heated to 1200 ℃, and hot rolling forms behind the insulation 2h, and has ferrite/pearlitic structrure.
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| CN106244924B (en) * | 2016-08-31 | 2017-12-29 | 东北大学 | A kind of cold rolling quenching ductile steel and preparation method |
| CN115852268B (en) * | 2022-12-28 | 2024-06-18 | 广东省科学院新材料研究所 | High-strength corrosion-resistant anti-cracking steel and preparation method and application thereof |
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