CN101445864B - Method for preparing high-intensity and high-plasticity iron steel material with high manganese and aluminum contents - Google Patents
Method for preparing high-intensity and high-plasticity iron steel material with high manganese and aluminum contents Download PDFInfo
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Abstract
A method for preparing a high-intensity and high-plasticity iron steel material with high manganese and aluminum contents belongs to the processing field of iron steel materials. A high-intensity and high-plasticity iron steel material with high manganese and aluminum contents includes the following components: C%: 0.6-1.2wt%, Mn%: 18-33wt%, Al%: 8-13wt%, S% less than 0.008%, P% less than 0.02%, Fe or inevitable impurities in balancing amount. The preparation methods comprises steps as follows: a material plate blank after the smelting preparation is prepared in the processes of heat rolling and cold rolling, the thickness of a cold-rolled plate is 0.8-1.5 mm, and the cold-rolled steel plate keeps the temperature of 700-1300 DEG C for 10-20 minutes in a heating furnace and cools at the speed of 10-50 DEG C/s to the room temperature. The invention can achieve different levels of intensity and plasticity proportions through process control, and the performance includes shear strength being 540-1240 MPa, tensile strength being 780-1310 MPa and extensibility being 10.0-76.0%. The high-intensity and high-plasticity iron steel material with high manganese and aluminum contents prepared by the invention plays a significant role and has great application space for the booming automobile industry and the military industry.
Description
Technical field
The invention belongs to the ferrous materials preparation field, relate to a kind of high strength, high-ductility inducing plasticity steel of high manganese high aluminium content.
Background technology
Fe-Mn-Al-C is that alloy is to grow up on the basis of Fe-Mn-C base and the basic alloy of Fe-Mn-Al, for the development of high mangaenese steel provides new approach.Because the density of Al is lower, therefore this material has very high intensity mass ratio (strength-to-weigh ratio).Relatively can reduce the weight of 14-20% with other iron alloy of equality strength level, therefore this ferrous materials can be used for the high-strength structure parts of requirement loss of weight, especially is beneficial to the aspects such as loss of weight of automobile.
Fe-Mn-Al-C is that the research of alloy mainly concentrates on the mechanical property of the relative higher Fe-Mn-Al base with C content of following both direction: Al alloy once by the extensive studies mistake.These researchs are (document 1:J.W.Lee on the basis based on age hardening mainly, T.F.Liu Materials, Phase transformations in anFe-8Al-30Mn-1.5Si-1.5C alloy), Chemistry and Physics 69 (2001) 192-198.).Studied 500-1000 ℃ of overaging and handled, aging time reaches 1-30 hour tissue variation.Document 2 (Je Doo, Kyung-Tae Park., Microband-induced plasticity in a high Mn-Al-C lightsteel.Materials Sci ence and Engineering A, 496 (2008) 417-424.) studied by ageing treatment (1000 ℃ are incubated 1 hour) best performance and can reach: yield strength 730Mpa, tensile strength 1000MPa, unit elongation reaches 55%.
By the visible existing technology of above analysis is alloy property with the Fe-Mn-Al-C that ageing treatment obtains single performance only, and the aging temperature height, and the time is long, is unfavorable for large-scale production.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of high-strength high-plasticity ferrous materials of high manganese high aluminium content solves aging temperature height in the existing technology, and the time is long, is unfavorable for the difficult problem of large-scale production.
A kind of preparation method of high-strength high-plasticity ferrous materials of high manganese high aluminium content, its composition range is: C%:0.6-1.2wt%, Mn%:18-33wt%, Al%:8-13wt%, S%＜0.008%, P%＜0.02%, surplus is Fe and unavoidable impurities.Stacking fault energy is controlled at 30-100mJmm
2Wherein the preferable range of manganese content is 20-28wt%; The preferable range of aluminium content is 9-12wt%.
Preparation process is:
1. adopt electromagnetic induction furnace vacuum melting, the applying argon gas protection is cast into slab.
2. utilize rolling technique, through hot rolling, cold rolling, wherein the hot rolled Heating temperature is 1200 ℃, be incubated after 3 hours, hot rolling on 350 2 roller hot rollss obtains thickness and is the latten about 2.5～3.5mm, and total deformation is 80～90%, hot-rolled temperature 1100-850 ℃, finishing temperature control is not less than 750 ℃.Cold rolling on 430 4-roller cold rolling mills, Cold Rolled Plate Thickness 0.8-1.5mm, optimum control is at 0.8-1.2mm, and cold rolling draft is controlled at 30-80%, and optimum control is at 50-70%.
3. thermal treatment process: the cold-rolled steel sheet that 0.8-1.5mm is thick in design temperature (700-1300 ℃) insulation after 10-20 minute, is cooled to room temperature with the speed of 10-50 ℃/s in process furnace.
Before the material microstructure thermal treatment after strain of the present invention be have in the austenitic matrix annealing twin and separate out (Fe, Mn)
3AlC
xCarbide, its grain-size are 2-40 μ m, annealing twin growth and through crystal grain inside; After distortion, form mechanical twin under external force, while slip band induced plastic in deformation process, these deformation mechanism actings in conjunction make ferrous materials of the present invention have high-strength high-plasticity.
This material obtains the intensity of different stage and the proportioning of plasticity by technology controlling and process, can obtain the yield strength of 540-1240MPa and tensile strength and the 10.0-76.0% unit elongation of 780-1310MPa.
The present invention has following advantage:
1. has good character.The present invention utilize sophisticated rolling technique and thermal treatment process to prepare to have annealing twin and separate out (Fe, Mn)
3AlC
xCarbide, its grain-size are 2-40 μ m, have unique microtexture.Material of the present invention has very high intensity mass ratio, relatively can reduce the weight of 14-20% with other iron alloy of equality strength level
2. application prospect is good.Because the special chemical ingredients of this ferrous materials makes material have the high-intensity high-ductility that has simultaneously through after the brief heat treating among the present invention.Therefore, the ferrous materials of this high-strength high-plasticity has important value to the automobile industry and the military project articles for use aspect of high speed development with the development that needs
3. the preparation method is simple.The present invention utilizes traditional steel-smelting technology, rolling technology and heat treatment technics, only needs control thermal treatment temp and time and speed of cooling to obtain.
4 costs are low.Ferrous materials of the present invention does not need to add valuable alloying element, only needs lower manganese, the aluminium element of price commonly used can obtain this ferrous materials.
Description of drawings
Metallographic structure after Fig. 1 thermal treatment
The annealing twin that Fig. 2 EBSD represents (red lines are annealing twin)
Exist in Fig. 3 matrix (Fe, Mn)
3AlC
xCarbide
Slip band after Fig. 4 distortion
Embodiment
Following drawings and Examples describe the present invention in detail
Embodiment 1
1. utilize traditional vacuum metling and hot rolling, cold-rolling process to prepare steel plate
Smelting technology: adopt electromagnetic induction furnace vacuum melting, the applying argon gas protection.Its composition is
C%:0.96wt%, Mn%:26.7wt%, Al%:10.9wt%, S%＜0.008%, P%＜0.02%, surplus is Fe or unavoidable impurities.Stacking fault energy is controlled at 85mJmm
2
Rolling technology: utilize rolling technique, through hot rolling, cold rolling, wherein the hot rolled Heating temperature is 1200 ℃, be incubated after 3 hours, hot rolling on 350 2 roller hot rollss, obtain thickness and be the latten about 2.5～3.5mm, total deformation is 80～90%, and its open rolling and finishing temperature are respectively 1100 ℃ and 850 ℃.Cold rolling on 430 4-roller cold rolling mills, be cold-rolled to the thick thin plate of 1.0mm, heat-treat.
2. thermal treatment process: the cold-rolled steel sheet that 1.0mm is thick 1100 ℃ of design temperatures, is incubated after 15 minutes in process furnace, is cooled to room temperature with the speed of 20 ℃/s.
The annealing twin that its room temperature texture is an austenitic matrix is observed by optical microstructure, and the tissue after the annealing has the straight annealing twin in border (illustrated in figures 1 and 2) to occur, have in crystal grain inside and crystal boundary (Fe, Mn)
3AlC
xCarbide (shown in Figure 3), the grain size 20-40 μ m of ferrous materials.There is slip band in Fig. 4 after being out of shape.Obtaining performance is: tensile strength is 880MPa, and yield strength is 580MPa, and unit elongation is 76.5%.
Embodiment 2
Difference from Example 1 is thermal treatment temp was controlled at 750 ℃ of insulations after 20 minutes, is cooled to room temperature with the speed of 10 ℃/s.The performance that obtains is: tensile strength is 1310MPa, and yield strength is 1240MPa, and unit elongation is 10.5%.
Embodiment 3
Difference from Example 1 is thermal treatment temp was controlled at 1300 ℃ of insulations after 10 minutes, is cooled to room temperature with the speed of 30 ℃/s.The performance that obtains is: tensile strength is 815MPa, and yield strength is 550MPa, and unit elongation is 51.0%.
Embodiment 4
Difference from Example 1 is that the composition of ferrous materials is:
C%:0.6wt%, Mn%:18wt%, Al%:8wt%, S%＜0.008%, P%＜0.02%, surplus is Fe or unavoidable impurities.Stacking fault energy is 35mJmm
2
Rolling technology is with the process of embodiment 1, and 900 ℃ of insulations of thermal treatment temp are after 15 minutes, is cooled to room temperature with the speed of 30 ℃/s.The performance that obtains is: tensile strength is 880MPa, and yield strength is 450MPa, and unit elongation is 65.0%.
Claims (5)
1. the preparation method of the high-strength high-plasticity ferrous materials of a high manganese high aluminium content is characterized in that the material composition scope is: C%:0.6-1.2wt%, Mn%:18-33wt%, Al%:8-13wt%, S%＜0.008%, P%＜0.02%, surplus is Fe and unavoidable impurities; Stacking fault energy is controlled at 30-100mJmm
2Preparation process is:
1). adopt electromagnetic induction furnace vacuum melting, the applying argon gas protection is cast into slab;
2). utilize rolling technique, through hot rolling, cold rolling, wherein the hot rolled Heating temperature is 1200 ℃, is incubated after 3 hours, and hot rolling on 350 2 roller hot rollss obtains the latten that thickness is 2.5～3.5mm, and total deformation is 80～90%, hot-rolled temperature 1100-750 ℃; Cold rolling on 430 4-roller cold rolling mills, Cold Rolled Plate Thickness 0.8-1.5mm, cold rolling draft is controlled at 30-80%;
3). thermal treatment process: the cold-rolled steel sheet that 0.8-1.5mm is thick after 10-20 minute, is cooled to room temperature with the speed of 10-50 ℃/s design temperature 700-1300 ℃ of insulation in process furnace.
2. the preparation method of the high-strength high-plasticity ferrous materials of high according to claim 1 manganese high aluminium content is characterized in that hot-rolled temperature 1100-850 ℃.
3. the preparation method of the high-strength high-plasticity ferrous materials of high according to claim 1 manganese high aluminium content is characterized in that cold rolling draft is controlled at 50-70%.
4. the preparation method of the high-strength high-plasticity ferrous materials of high according to claim 1 manganese high aluminium content, it is characterized in that described thermal treatment process be cold-rolled steel sheet that 0.8-1.5mm is thick in process furnace design temperature 750-1300 ℃ of insulation after 10-20 minute, be cooled to room temperature with the speed of 10-20 ℃/s.
5. the preparation method of the high-strength high-plasticity ferrous materials of high according to claim 1 manganese high aluminium content is characterized in that Cold Rolled Plate Thickness is 0.8-1.2mm.
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| TWI445832B (en) * | 2011-09-29 | 2014-07-21 | The composition design and processing methods of high strength, high ductility, and high corrosion resistance alloys | |
| CN104894471A (en) * | 2014-03-04 | 2015-09-09 | 宝钢特钢有限公司 | High-manganese high-aluminum vanadium-containing non-magnetic steel plate and manufacturing method thereof |
| CN107245634A (en) * | 2017-05-27 | 2017-10-13 | 江苏金基特钢有限公司 | A kind of preparation method of automobile steel |
| CN107641763B (en) * | 2017-09-29 | 2019-08-30 | 安徽工业大学工商学院 | A kind of low-density potassium steel of high strength and ductility |
| CN108504953A (en) * | 2018-06-05 | 2018-09-07 | 太原理工大学 | A kind of preparation method of ferrimanganic aluminium carbon alloy structural steel |
| CN110205459B (en) * | 2019-07-25 | 2020-12-22 | 重庆大学 | Heat treatment method of ferro-manganese-aluminum-carbon austenite low-density steel |
| CN115572885A (en) * | 2022-09-09 | 2023-01-06 | 钢铁研究总院有限公司 | Manufacturing method of high-strength high-toughness plastic austenite type low-density steel |
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