CN117626136A - High-strength high-plasticity hot-rolled high-manganese NPR steel and preparation method thereof - Google Patents
High-strength high-plasticity hot-rolled high-manganese NPR steel and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- 239000011572 manganese Substances 0.000 title claims abstract description 76
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 48
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 40
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 35
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000005482 strain hardening Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 238000010791 quenching Methods 0.000 claims abstract 2
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- 238000004519 manufacturing process Methods 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 14
- 238000009826 distribution Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 16
- 239000000203 mixture Substances 0.000 abstract description 15
- 229910000617 Mangalloy Inorganic materials 0.000 abstract description 11
- 229910052758 niobium Inorganic materials 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 230000009466 transformation Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 238000005098 hot rolling Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 238000005520 cutting process Methods 0.000 description 1
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Abstract
本发明提供一种高强度高塑性热轧高锰NPR钢及其制备方法,属于高锰钢制备技术领域。本发明所述高锰钢的化学成分按质量百分比计为:C:0.3~0.6%,Mn:20~25%,Nb:0.02~0.05%,S≤0.005%,P≤0.005%,其余为Fe和不可避免的杂质元素。制备方法包括以下步骤:采用真空冶炼技术,浇筑成坯;对板坯进行加热保温;保温后的板坯进行高温连续轧制;终轧结束后水淬至室温。本发明通过调配材料中奥氏体和ε马氏体的体积分数来控制材料的综合性能,依据上述步骤制备的高锰NPR钢屈服强度为300~400Mpa,抗拉强度为1000~1200Mpa,加工硬化指数≥0.85,断后延伸率为85~95%,强塑积≥96Gpa·%。
The invention provides a high-strength, high-plasticity hot-rolled high-manganese NPR steel and a preparation method thereof, and belongs to the technical field of high-manganese steel preparation. The chemical composition of the high manganese steel of the present invention is calculated in mass percentage: C: 0.3~0.6%, Mn: 20~25%, Nb: 0.02~0.05%, S≤0.005%, P≤0.005%, and the rest is Fe and inevitable impurity elements. The preparation method includes the following steps: using vacuum smelting technology to pour into a slab; heating and insulating the slab; subjecting the insulated slab to high-temperature continuous rolling; and water quenching to room temperature after the final rolling. The present invention controls the comprehensive properties of the material by adjusting the volume fraction of austenite and ε martensite in the material. The yield strength of the high manganese NPR steel prepared according to the above steps is 300-400Mpa, the tensile strength is 1000-1200Mpa, and the work hardening The index is ≥0.85, the elongation after fracture is 85-95%, and the strong plastic volume is ≥96Gpa·%.
Description
技术领域Technical field
本发明属于高锰钢制备技术领域,具体涉及一种高强度高塑性热轧高锰NPR钢及其制备方法The invention belongs to the technical field of high manganese steel preparation, and specifically relates to a high-strength, high-plasticity hot-rolled high-manganese NPR steel and a preparation method thereof.
背景技术Background technique
随着能源需求量的增加,资源开采深度与规模不断增大,深层岩石地质环境复杂,往往具有高地应力、大变形等特点,岩体表现为大变形力学状态。传统的支护材料由于抗拉强度低,延伸性能差,变形不均匀等特点,易发生局部变形,造成颈缩破断失效,难以满足深部岩层的支护需求,容易导致工程灾害的发生。负泊松比(Negative Poisson’s ratio,NPR)锚杆钢具有高强度高韧性、无屈服平台及超强吸能作用,可以有效的解决这一问题。With the increase in energy demand, the depth and scale of resource extraction continue to increase. The geological environment of deep rock is complex and often has characteristics such as high ground stress and large deformation. The rock mass exhibits a large deformation mechanical state. Due to the characteristics of low tensile strength, poor elongation performance, and uneven deformation, traditional support materials are prone to local deformation, causing necking and fracture failure. They are difficult to meet the support needs of deep rock formations and can easily lead to engineering disasters. Negative Poisson’s ratio (NPR) anchor steel has high strength and toughness, no yield platform and super energy absorption, which can effectively solve this problem.
NPR锚杆钢的设计成分为高锰钢,在常温下,高锰钢的组织通常以单相奥氏体或奥氏体+马氏体。其中奥氏体为面心立方结构,点阵滑移系较多,滑移易开动,保证材料具有良好的塑性,而马氏体的存在又保证了材料高的强度和硬度。另外在变形过程中具有fcc结构的γ奥氏体逐渐向hcp结构的ε马氏体转变,同时也存在ε马氏体向bcc结构的α’马氏体的转变,在组织转变过程中通常会引起显著的加工硬化行为,引发相变诱导塑性(TRIP)效应,使得材料的强度和塑性得到同时提升。另外,Nb元素的添加可以起到细化晶粒的作用,合金中的C和Nb元素结合产生细小的NbC沉淀物细化由奥氏体转化形成的马氏体片,可以使合金在具有高塑性的同时保证高的抗拉强度。The design composition of NPR anchor steel is high manganese steel. At normal temperature, the structure of high manganese steel is usually single-phase austenite or austenite + martensite. Among them, austenite has a face-centered cubic structure, with many lattice slip systems, and the slip is easy to activate, ensuring the material has good plasticity, while the presence of martensite ensures the material's high strength and hardness. In addition, during the deformation process, the γ austenite with the fcc structure gradually transforms into the ε martensite with the hcp structure. At the same time, there is also a transformation from ε martensite to the α' martensite with the bcc structure. During the structural transformation process, there is usually It causes significant work hardening behavior and triggers the transformation-induced plasticity (TRIP) effect, which improves the strength and plasticity of the material at the same time. In addition, the addition of Nb element can refine the grains. The combination of C and Nb elements in the alloy produces fine NbC precipitates to refine the martensite flakes formed by austenite transformation, which can make the alloy have high performance. Plasticity while ensuring high tensile strength.
发明专利《NPR无磁性锚杆钢材料及其生产方法》(公开号为:CN108754305A)公开了一种质量百分比为:C:0.4-0.7%,Mn:15-20%,Cr:1-18%,Si:0.3-3%,Ca:0.05-0.15%,Cu:≤0.03%,Ni:≤0.02%,S:≤0.001%,P:≤0.001%的全奥氏体无磁性锚杆钢材料,材料中的Cr能够增加Fe-Mn合金层错能,使得层错几率减小,马氏体相变驱动力也下降,使其延伸率降低。Si元素能提高钢的强度和硬度,但也会降低材料的塑性。The invention patent "NPR Non-magnetic Anchor Steel Material and Production Method" (publication number: CN108754305A) discloses a mass percentage of: C: 0.4-0.7%, Mn: 15-20%, Cr: 1-18% , Si: 0.3-3%, Ca: 0.05-0.15%, Cu: ≤ 0.03%, Ni: ≤ 0.02%, S: ≤ 0.001%, P: ≤ 0.001% all-austenitic non-magnetic anchor steel material, Cr in the material can increase the stacking fault energy of Fe-Mn alloy, reducing the stacking fault probability and the driving force of martensitic phase transformation, which reduces the elongation. Si element can improve the strength and hardness of steel, but it can also reduce the plasticity of the material.
发明专利《NPR锚杆钢材料的生产方法》(公开号为:CN108754339B)公开了质量百分比为:C:0.4-0.7%,Mn:15-20%,Si:≤0.1%,Cr:≤0.01%,Cu:≤0.03%,Ni:≤0.02%,S:≤0.001%,P:≤0.001%,其余为Fe和不可避免的杂质元素。该发明中Mn的含量较低,在拉伸变形过程中不能同时发生奥氏体向ε马氏体和ε马氏体向α’马氏体的转变,加工硬化率较低,不能发生充分的TRIP效应,使其延伸率低于80%。The invention patent "Production Method of NPR Anchor Steel Materials" (publication number: CN108754339B) discloses that the mass percentages are: C: 0.4-0.7%, Mn: 15-20%, Si: ≤0.1%, Cr: ≤0.01% , Cu: ≤ 0.03%, Ni: ≤ 0.02%, S: ≤ 0.001%, P: ≤ 0.001%, and the rest are Fe and inevitable impurity elements. The content of Mn in this invention is low, and the transformation of austenite to ε martensite and ε martensite to α' martensite cannot occur simultaneously during the tensile deformation process. The work hardening rate is low and sufficient transformation cannot occur. TRIP effect, making its elongation less than 80%.
为此,仍需开发提高高锰NPR钢综合性能的技术,以解决应用问题。For this reason, it is still necessary to develop technology to improve the comprehensive performance of high manganese NPR steel to solve application problems.
发明内容Contents of the invention
本发明的目的是为克服现有技术的不足,提供一种通过合理成分配比和优化变形量,控制平均晶粒尺寸,调控奥氏体体积分数和稳定性,以及有效的TRIP效应达到高加工硬化率,提高高锰NPR钢的综合性能,同时降低合金化成本。The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a method to achieve high machining by controlling the average grain size, regulating the austenite volume fraction and stability through reasonable component ratio and optimizing the amount of deformation, and effective TRIP effect. Hardening rate, improve the comprehensive performance of high manganese NPR steel, while reducing alloying costs.
实现上述目的的一个方面是提供一种高强度高塑性热轧高锰NPR钢,其组分及质量百分比含量为:C:0.3~0.6%,Mn:20~25%,Nb:0.02~0.05%,S≤0.005%,P≤0.005%,其余为Fe和不可避免的杂质元素。One aspect to achieve the above purpose is to provide a high-strength and high-plasticity hot-rolled high-manganese NPR steel, whose components and mass percentages are: C: 0.3~0.6%, Mn: 20~25%, Nb: 0.02~0.05% , S≤0.005%, P≤0.005%, and the rest are Fe and inevitable impurity elements.
进一步地,高强度高塑性热轧高锰NPR钢的组分及质量百分比含量为:C:0.35~0.55%,Mn:20.3~24.7%,Nb:0.021~0.045%,S≤0.005%,P≤0.005%,其余为Fe和不可避免的杂质元素。Furthermore, the components and mass percentages of high-strength and high-plasticity hot-rolled high-manganese NPR steel are: C: 0.35~0.55%, Mn: 20.3~24.7%, Nb: 0.021~0.045%, S≤0.005%, P≤ 0.005%, the rest is Fe and inevitable impurity elements.
进一步地,所述高强度高塑性热轧高锰NPR钢的屈服强度为300~400Mpa,抗拉强度为1000~1200Mpa,加工硬化指数≥0.85,断后延伸率为85~95%,强塑积≥96Gpa·%。Further, the high-strength and high-plasticity hot-rolled high-manganese NPR steel has a yield strength of 300-400Mpa, a tensile strength of 1000-1200Mpa, a work hardening index ≥ 0.85, an elongation after fracture of 85-95%, and a strong plastic area ≥ 96Gpa·%.
实现上述目的的另一个方面是提供一种高强度高塑性热轧高锰NPR钢的生产方法,包括以下步骤:Another aspect to achieve the above purpose is to provide a production method of high-strength and high-plasticity hot-rolled high-manganese NPR steel, which includes the following steps:
(1)按照一种高强度高塑性热轧高锰NPR钢的化学成分以质量百分比配比,采用真空冶炼技术,浇筑成坯;(1) According to the chemical composition of a high-strength and high-plasticity hot-rolled high-manganese NPR steel, proportioned by mass percentage, vacuum smelting technology is used to cast the billet;
(2)在轧制前对板坯进行加热,其加热温度控制1100~1200℃,在此温度下保温120~180min;(2) Heating the slab before rolling, the heating temperature is controlled at 1100~1200℃, and kept at this temperature for 120~180min;
(3)将保温后的板坯在900~1150℃进行高温连续轧制,总压下率不低于80~90%,终轧结束后水淬至室温,制得高强度高塑性热轧高锰NPR钢。(3) The heat-insulated slab is subjected to high-temperature continuous rolling at 900 to 1150°C, with a total reduction rate of not less than 80 to 90%. After the final rolling is completed, the water is quenched to room temperature to obtain high-strength and high-plasticity hot-rolled steel. Manganese NPR steel.
所述高强度高塑性热轧高锰NPR钢的化学成分,按质量百分比计,C:0.3~0.6%,Mn:20~25%,Nb:0.02~0.05%,S≤0.005%,P≤0.005%,其余为Fe和不可避免的杂质元素。The chemical composition of the high-strength and high-plasticity hot-rolled high-manganese NPR steel, in terms of mass percentage, is C: 0.3-0.6%, Mn: 20-25%, Nb: 0.02-0.05%, S≤0.005%, P≤0.005 %, the rest is Fe and inevitable impurity elements.
所述制得高强度高塑性热轧高锰NPR钢的屈服强度为300~400Mpa,抗拉强度为1000~1200Mpa,加工硬化指数≥0.85,断后延伸率为85~95%,强塑积≥96Gpa·%。The yield strength of the high-strength and high-plasticity hot-rolled high manganese NPR steel is 300-400Mpa, the tensile strength is 1000-1200Mpa, the work hardening index is ≥0.85, the elongation after fracture is 85-95%, and the strong plastic volume is ≥96Gpa ·%.
进一步地,步骤(2)中所述的加热,温度控制在1140~1170℃,保温时间为120min。Further, in the heating described in step (2), the temperature is controlled at 1140-1170°C, and the holding time is 120 minutes.
进一步地,步骤(3)中所述的高温连续轧制的开轧温度为1080~1100℃,终轧温度为950~970℃。Further, the opening rolling temperature of the high-temperature continuous rolling described in step (3) is 1080-1100°C, and the final rolling temperature is 950-970°C.
进一步地,步骤(3)中所述的高温连续轧制的道次为7~8次,单道次压下率为20~22%,总压下率为84~87%。Further, the number of passes of high-temperature continuous rolling described in step (3) is 7 to 8 times, the reduction rate of a single pass is 20 to 22%, and the total reduction rate is 84 to 87%.
进一步地,步骤(3)中所述的制得高强度高塑性热轧高锰NPR钢的微观组织为奥氏体和ε马氏体,其中奥氏体的体积百分比为50~60%;所述奥氏体和ε马氏体组织呈现均匀的层状交替分布。Further, the microstructure of the high-strength and high-plasticity hot-rolled high-manganese NPR steel produced in step (3) is austenite and ε martensite, wherein the volume percentage of austenite is 50 to 60%; The austenite and ε martensite structures present a uniform layered alternating distribution.
本发明各种原料及主要工艺的作用及机理:The functions and mechanisms of various raw materials and main processes of the present invention:
C:C元素主要富集在残余奥氏体中,增加残余奥氏体数量,提高奥氏体稳定性;同时起固溶强化的作用,提高钢的抗拉强度,是钢中最经济有效的强化元素。若设计中的C含量偏低,则无法获得良好的固溶强化效果;但C含量偏高则会引起过多碳化物析出,导致钢的塑性降低。因此从经济性和综合性能出发,本发明中的C含量控制在0.3~0.6%,优选地C含量在0.35~0.55%。C: C element is mainly concentrated in retained austenite, increasing the amount of retained austenite and improving austenite stability; it also plays the role of solid solution strengthening and improves the tensile strength of steel. It is the most economical and effective element in steel. Strengthening elements. If the C content in the design is low, good solid solution strengthening effect cannot be obtained; but if the C content is high, excessive carbide precipitation will occur, resulting in reduced plasticity of the steel. Therefore, from the perspective of economy and comprehensive performance, the C content in the present invention is controlled at 0.3-0.6%, and preferably the C content is 0.35-0.55%.
Mn:Mn元素是高锰钢中的主要合金元素,具有扩大奥氏体相区并稳定奥氏体组织的作用。Mn元素通过影响奥氏体中的层错能从而影响钢的变形机制,随着Mn含量的逐步增大,高锰钢中组织转变机制由奥氏体→α’马氏体转变,发展为由奥氏体→ε马氏体→α’马氏体转变,进一步发展为奥氏体→ε马氏体转变。另外随着Mn含量的增加,合金中的ε马氏体含量逐渐增加,马氏体板条更细小,板条之间的交叉更密集,可提高钢的强度和硬度。但是过高的Mn会促进铸态组织中网状碳化物的形成,阻碍轧制和变形,恶化低温韧性。因此Mn的含量范围控制在20~25%,优选地Mn含量在20.3~24.7%。Mn: Mn element is the main alloy element in high manganese steel, which has the function of expanding the austenite phase area and stabilizing the austenite structure. Mn element affects the deformation mechanism of steel by affecting the stacking fault energy in austenite. As the Mn content gradually increases, the structural transformation mechanism in high manganese steel changes from austenite to α' martensite, and develops as Austenite → ε martensite → α' martensite transformation, and further develops into austenite → ε martensite transformation. In addition, as the Mn content increases, the ε martensite content in the alloy gradually increases, the martensite laths become smaller, and the intersections between the laths become denser, which can improve the strength and hardness of the steel. However, too high Mn will promote the formation of network carbides in the as-cast structure, hinder rolling and deformation, and worsen low-temperature toughness. Therefore, the Mn content range is controlled at 20-25%, and preferably the Mn content is 20.3-24.7%.
Nb:Nb元素在组织中和C结合生成的碳化物NbC可以阻止晶粒长大,起到细化晶粒的作用,可以有效提高钢的强度,同时可以降低钢的回火脆;但钢材的塑性和韧性以及延伸率会有所影响。因此Nb的含量范围控制在0.02~0.05%,优选地Nb含量在0.021~0.045%。Nb: The carbide NbC formed by the combination of Nb element and C in the structure can prevent the growth of grains and refine the grains. It can effectively improve the strength of steel and reduce the temper brittleness of steel; but the Plasticity and toughness as well as elongation will be affected. Therefore, the Nb content range is controlled between 0.02% and 0.05%, and preferably the Nb content ranges between 0.021% and 0.045%.
S:S元素在钢中通常属于有害元素,不仅影响材料的强度、焊接性能,还易形成硫化物夹杂,恶化材料的塑性和韧性;但S能改善钢的切削性能。因此,S含量的范围应≤0.005%。S: The S element is usually a harmful element in steel. It not only affects the strength and welding performance of the material, but also easily forms sulfide inclusions, deteriorating the plasticity and toughness of the material; however, S can improve the cutting performance of steel. Therefore, the range of S content should be ≤0.005%.
P:P元素在钢中通常属于有害元素,由于钢中含有大量的Mn元素,会增大P在晶界的偏聚,弱化晶界,故P含量应尽可能降低。因此,P含量的范围应≤0.005%。P: P element is usually a harmful element in steel. Since steel contains a large amount of Mn element, it will increase the segregation of P at the grain boundaries and weaken the grain boundaries, so the P content should be reduced as much as possible. Therefore, the range of P content should be ≤0.005%.
本发明之所以在轧制前对板坯进行加热,其加热温度控制1100~1200℃,在此温度下保温120~180min,是由于根据合金成分,加热到1100~1200℃可软化材料,提高轧机的变形能力,实现大压下量热轧。保温时间在120~180min为了保证板坯试样心部温度达到1080℃以上,保温时间不应过长,时间过长易导致晶粒粗大。The reason why the present invention heats the slab before rolling, and controls the heating temperature to 1100-1200°C, and keeps it at this temperature for 120-180 minutes, is because according to the alloy composition, heating to 1100-1200°C can soften the material and improve the quality of the rolling mill. The deformation ability enables hot rolling with large reduction. The heat preservation time is 120 to 180 minutes. In order to ensure that the core temperature of the slab sample reaches above 1080°C, the heat preservation time should not be too long. Too long a time can easily lead to coarse grains.
本发明之所以开炉在900~1150℃进行高温连续轧制,总压下率不低于80~90%,是由于在此温度下才可以实现单道次大变形量的轧制,不低于80~90%的总压下率可有效细化晶粒。The reason why the present invention opens the furnace for high-temperature continuous rolling at 900-1150°C, and the total reduction rate is not less than 80-90%, is because only at this temperature can single-pass large deformation rolling be achieved, which is not low. The total reduction rate of 80 to 90% can effectively refine the grains.
与现有技术相比,本发明具有以下优点:Compared with the prior art, the present invention has the following advantages:
1.本发明成分设计简单,仅需C、Mn及微量Nb元素,材料生产制备简单,合金化成本低,适用范围广;本发明采用高温连续轧制,轧制工艺简单,可行性高,缩短生产线,减少生产周期,降低了生产成本和资源消耗。1. The composition design of the present invention is simple, requiring only C, Mn and trace Nb elements, simple material production and preparation, low alloying cost, and wide application range; the present invention adopts high-temperature continuous rolling, the rolling process is simple, high feasibility, and shortened production line, reducing the production cycle, reducing production costs and resource consumption.
2.本发明通过对合金成分、加工过程中的保温时间、轧制过程中的压下量以及轧后冷却方式的设计,控制组织中的奥氏体和ε马氏体的体积分数、形状及分布状态,使制备的高锰NPR钢的屈服强度为300~500Mpa,抗拉强度为1000~1200Mpa,有效的TRIP效应提高钢的加工硬化率,加工硬化指数≥0.85,使得钢在拉伸过程中的局部颈缩被推迟,得到80~95%断后总延伸率,强塑积≥96.9Gpa·%,极大地提高了材料的综合性能。2. The present invention controls the volume fraction, shape and shape of austenite and ε martensite in the structure by designing the alloy composition, holding time during processing, reduction amount during rolling and cooling method after rolling. Distribution state, the yield strength of the prepared high manganese NPR steel is 300~500Mpa, and the tensile strength is 1000~1200Mpa. The effective TRIP effect improves the work hardening rate of the steel, and the work hardening index is ≥0.85, making the steel during the stretching process The local necking is delayed, and the total elongation after fracture is 80-95%, and the strong plastic product is ≥96.9Gpa·%, which greatly improves the overall performance of the material.
附图说明Description of drawings
图1为本发明实施例1中高强度高塑性热轧高锰NPR钢的菊池带衬度图;Figure 1 is a Kikuchi zone contrast diagram of high-strength, high-plasticity hot-rolled high-manganese NPR steel in Example 1 of the present invention;
图2为本发明实施例1中高强度高塑性热轧高锰NPR钢的应力—应变曲线曲线;Figure 2 is the stress-strain curve of high-strength, high-plasticity hot-rolled high-manganese NPR steel in Example 1 of the present invention;
图3为本发明实施例1中高强度高塑性热轧高锰NPR钢的加工硬化率及真应力—真应变曲线。Figure 3 shows the work hardening rate and true stress-true strain curve of high-strength, high-plasticity hot-rolled high-manganese NPR steel in Example 1 of the present invention.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅用以解释本发明,并不用于限定本发明。In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.
实施例1Example 1
一种高强度高塑性热轧高锰NPR钢,所述高锰钢的化学成分按质量百分比计为:C:0.46%,Mn:20.1%,Nb:0.022%,S≤0.005%,P≤0.005%,其余为Fe和不可避免的杂质元素。A kind of high-strength and high-plasticity hot-rolled high-manganese NPR steel. The chemical composition of the high-manganese steel in mass percentage is: C: 0.46%, Mn: 20.1%, Nb: 0.022%, S≤0.005%, P≤0.005 %, the rest is Fe and inevitable impurity elements.
上述高强度高塑性热轧高锰NPR钢的生产方法,包括以下步骤:The production method of the above-mentioned high-strength and high-plasticity hot-rolled high-manganese NPR steel includes the following steps:
(1)按照高锰NPR钢的化学成分以质量百分比配比,采用真空冶炼技术,浇筑成坯;(1) According to the chemical composition of high manganese NPR steel, proportion it by mass percentage, use vacuum smelting technology, and pour it into a billet;
(2)在轧制前对空冷的板坯进行加热,其加热温度控制1140℃,在此温度下保温120min;(2) Before rolling, the air-cooled slab is heated, the heating temperature is controlled at 1140°C, and kept at this temperature for 120 minutes;
(3)将保温后的板坯进行高温连续轧制,开轧温度为1090℃,终轧温度为960℃。所述板坯需经过8道次热轧,总压下率为84.9%,轧板厚度为11.3mm,轧后水冷至室温,热轧板的菊池带衬度图如图1所示。(3) The heat-insulated slab is subjected to high-temperature continuous rolling, with the starting rolling temperature being 1090°C and the final rolling temperature being 960°C. The slab needs to go through 8 passes of hot rolling, with a total reduction rate of 84.9%, and a thickness of the rolled plate of 11.3mm. After rolling, the slab is water-cooled to room temperature. The Kikuchi zone contrast diagram of the hot-rolled plate is shown in Figure 1.
本发明所制备的高强度高塑性热轧高锰NPR钢的微观组织为奥氏体和ε马氏体两相组织,其中,奥氏体的体积百分比为57.5%;所述奥氏体和ε马氏体组织呈现均匀的层状交替分布。The microstructure of the high-strength and high-plasticity hot-rolled high-manganese NPR steel prepared by the present invention is a two-phase structure of austenite and ε martensite, in which the volume percentage of austenite is 57.5%; the austenite and ε martensite The martensite structure presents a uniform layered alternating distribution.
本发明所制备的高强度高塑性热轧高锰NPR钢单向拉伸后,其组织中奥氏体和ε马氏体充分发生TRIP效应,其抗拉强度为1104.1Mpa,伸长率为88.1%,强塑积为97.3Gpa%,屈服强度为320.3Mpa,其应力—应变曲线如图2所示。有效的TRIP效应提高钢的加工硬化率,加工硬化指数达到0.92,使得钢在拉伸过程中的局部颈缩被推迟,加工硬化率及真应力—真应变曲线如图3所示。After the high-strength and high-plasticity hot-rolled high-manganese NPR steel prepared by the present invention is uniaxially stretched, the TRIP effect of austenite and ε martensite in its structure fully occurs, its tensile strength is 1104.1Mpa, and its elongation is 88.1 %, the strong plastic product is 97.3Gpa%, the yield strength is 320.3Mpa, and its stress-strain curve is shown in Figure 2. The effective TRIP effect increases the work hardening rate of the steel, and the work hardening index reaches 0.92, which delays the local necking of the steel during the stretching process. The work hardening rate and true stress-true strain curve are shown in Figure 3.
实施例2Example 2
一种高强度高塑性热轧高锰NPR钢,所述高锰钢的化学成分按质量百分比计为:C:0.47%,Mn:22.8%,Nb:0.025%,S≤0.005%,P≤0.005%,其余为Fe和不可避免的杂质元素。A kind of high-strength and high-plasticity hot-rolled high-manganese NPR steel. The chemical composition of the high-manganese steel in mass percentage is: C: 0.47%, Mn: 22.8%, Nb: 0.025%, S≤0.005%, P≤0.005 %, the rest is Fe and inevitable impurity elements.
上述高强度高塑性热轧高锰NPR钢的生产方法,包括以下步骤:The production method of the above-mentioned high-strength and high-plasticity hot-rolled high-manganese NPR steel includes the following steps:
(1)按照高锰NPR钢的化学成分以质量百分比配比,采用真空冶炼技术,浇筑成坯;(1) According to the chemical composition of high manganese NPR steel, proportion it by mass percentage, use vacuum smelting technology, and pour it into a billet;
(2)在轧制前对空冷的板坯进行加热,其加热温度控制1150℃,在此温度下保温120min;(2) Heat the air-cooled slab before rolling. The heating temperature is controlled at 1150°C and kept at this temperature for 120 minutes;
(3)将保温后的板坯进行高温连续轧制,开轧温度为1100℃,终轧温度为970℃。所述板坯需经过8道次热轧,总压下率为85.6%,轧后水冷至室温。(3) The heat-insulated slab is subjected to high-temperature continuous rolling, with the starting rolling temperature being 1100°C and the final rolling temperature being 970°C. The slab needs to go through 8 passes of hot rolling with a total reduction rate of 85.6%. After rolling, it is water-cooled to room temperature.
本发明所制备的高强度高塑性热轧高锰NPR钢的微观组织为奥氏体和ε马氏体两相组织,其中,奥氏体的体积百分比为56.3%;所述奥氏体和ε马氏体组织呈现均匀的层状交替分布。The microstructure of the high-strength and high-plasticity hot-rolled high-manganese NPR steel prepared by the present invention is a two-phase structure of austenite and ε martensite, in which the volume percentage of austenite is 56.3%; the austenite and ε The martensite structure presents a uniform layered alternating distribution.
本发明所制备的高强度高塑性热轧高锰NPR钢单向拉伸后,其组织中奥氏体和ε马氏体充分发生TRIP效应,其抗拉强度为1112.3Mpa,有效的TRIP效应提高钢的加工硬化率,加工硬化指数达到0.90,使得钢在拉伸过程中的局部颈缩被推迟,伸长率为86.5%,强塑积为96.2Gpa%,屈服强度为331.5Mpa。After the high-strength and high-plasticity hot-rolled high-manganese NPR steel prepared by the present invention is uniaxially stretched, the TRIP effect fully occurs in austenite and ε martensite in its structure, and its tensile strength is 1112.3Mpa, and the effective TRIP effect is improved The work hardening rate and work hardening index of the steel reaches 0.90, which delays the local necking of the steel during the stretching process. The elongation rate is 86.5%, the strong plastic product is 96.2Gpa%, and the yield strength is 331.5Mpa.
实施例3Example 3
一种高强度高塑性热轧高锰NPR钢,所述高锰钢的化学成分按质量百分比计为:C:0.35%,Mn:23.2%,Nb:0.043%,S≤0.005%,P≤0.005%,其余为Fe和不可避免的杂质元素。A kind of high-strength and high-plasticity hot-rolled high-manganese NPR steel. The chemical composition of the high-manganese steel in mass percentage is: C: 0.35%, Mn: 23.2%, Nb: 0.043%, S≤0.005%, P≤0.005 %, the rest is Fe and inevitable impurity elements.
上述高强度高塑性热轧高锰NPR钢的生产方法,包括以下步骤:The production method of the above-mentioned high-strength and high-plasticity hot-rolled high-manganese NPR steel includes the following steps:
(1)按照高锰NPR钢的化学成分以质量百分比配比,采用真空冶炼技术,浇筑成坯;(1) According to the chemical composition of high manganese NPR steel, proportion it by mass percentage, use vacuum smelting technology, and pour it into a billet;
(2)在轧制前对空冷的板坯进行加热,其加热温度控制1160℃,在此温度下保温120min;(2) Before rolling, the air-cooled slab is heated, the heating temperature is controlled at 1160°C, and kept at this temperature for 120 minutes;
(3)将保温后的板坯进行高温连续轧制,开轧温度为1120℃,终轧温度为980℃。所述板坯需经过8道次热轧,总压下率为86.14%,轧后水冷至室温。(3) The heat-insulated slab is subjected to high-temperature continuous rolling, with the starting rolling temperature being 1120°C and the final rolling temperature being 980°C. The slab needs to go through 8 passes of hot rolling with a total reduction rate of 86.14%. After rolling, it is water-cooled to room temperature.
本发明所制备的高强度高塑性热轧高锰NPR钢的微观组织为奥氏体和ε马氏体两相组织,其中,奥氏体的体积百分比为55.9%;所述奥氏体和ε马氏体组织呈现均匀的层状交替分布。The microstructure of the high-strength and high-plasticity hot-rolled high-manganese NPR steel prepared by the present invention is a two-phase structure of austenite and ε martensite, in which the volume percentage of austenite is 55.9%; the austenite and ε The martensite structure presents a uniform layered alternating distribution.
本发明所制备的高强度高塑性热轧高锰NPR钢单向拉伸后,其组织中奥氏体和ε马氏体充分发生TRIP效应,其抗拉强度为1096.5Mpa,有效的TRIP效应提高钢的加工硬化率,加工硬化指数达到0.94,使得钢在拉伸过程中的局部颈缩被推迟,伸长率为88.7%,强塑积为97.3Gpa%,屈服强度为313.9Mpa。After the high-strength and high-plasticity hot-rolled high-manganese NPR steel prepared by the present invention is uniaxially stretched, the TRIP effect fully occurs in austenite and ε martensite in its structure, and its tensile strength is 1096.5Mpa, and the effective TRIP effect is improved The work hardening rate and work hardening index of the steel reached 0.94, which delayed the local necking of the steel during the stretching process. The elongation rate was 88.7%, the strong plastic product was 97.3Gpa%, and the yield strength was 313.9Mpa.
实施例4Example 4
一种高强度高塑性热轧高锰NPR钢,所述高锰钢的化学成分按质量百分比计为:C:0.55%,Mn:24.7%,Nb:0.03%,S≤0.005%,P≤0.005%,其余为Fe和不可避免的杂质元素。A kind of high-strength and high-plasticity hot-rolled high-manganese NPR steel. The chemical composition of the high-manganese steel in mass percentage is: C: 0.55%, Mn: 24.7%, Nb: 0.03%, S≤0.005%, P≤0.005 %, the rest is Fe and inevitable impurity elements.
上述高强度高塑性热轧高锰NPR钢的生产方法,包括以下步骤:The production method of the above-mentioned high-strength and high-plasticity hot-rolled high-manganese NPR steel includes the following steps:
(1)按照高锰NPR钢的化学成分以质量百分比配比,采用真空冶炼技术,浇筑成坯;(1) According to the chemical composition of high manganese NPR steel, proportion it by mass percentage, use vacuum smelting technology, and pour it into a billet;
(2)在轧制前对空冷的板坯进行加热,其加热温度控制1150℃,在此温度下保温120min;(2) Heat the air-cooled slab before rolling. The heating temperature is controlled at 1150°C and kept at this temperature for 120 minutes;
(3)将保温后的板坯进行高温连续轧制,开轧温度为1110℃,终轧温度为970℃。所述板坯需经过8道次热轧,总压下率为84.29%,轧后水冷至室温。(3) The heat-insulated slab is subjected to high-temperature continuous rolling, with the starting rolling temperature being 1110°C and the final rolling temperature being 970°C. The slab needs to go through 8 passes of hot rolling with a total reduction rate of 84.29%. After rolling, it is water-cooled to room temperature.
本发明所制备的高强度高塑性热轧高锰NPR钢的微观组织为奥氏体和ε马氏体两相组织,其中,奥氏体的体积百分比为54.81%;所述奥氏体和ε马氏体组织呈现均匀的层状交替分布。The microstructure of the high-strength and high-plasticity hot-rolled high-manganese NPR steel prepared by the present invention is a two-phase structure of austenite and ε martensite, in which the volume percentage of austenite is 54.81%; the austenite and ε The martensite structure presents a uniform layered alternating distribution.
本发明所制备的高强度高塑性热轧高锰NPR钢单向拉伸后,其组织中奥氏体和ε马氏体充分发生TRIP效应,其抗拉强度为1241.4Mpa,有效的TRIP效应提高钢的加工硬化率,加工硬化指数达到0.88,使得钢在拉伸过程中的局部颈缩被推迟,伸长率为77.6%,强塑积为96.3Gpa%,屈服强度为352.8Mpa。After the high-strength and high-plasticity hot-rolled high-manganese NPR steel prepared by the present invention is uniaxially stretched, the austenite and ε martensite in its structure fully undergo the TRIP effect, and its tensile strength is 1241.4Mpa, and the effective TRIP effect is improved The work hardening rate and work hardening index of the steel reached 0.88, which delayed the local necking of the steel during the stretching process. The elongation rate was 77.6%, the strong plastic product was 96.3Gpa%, and the yield strength was 352.8Mpa.
Claims (8)
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