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1.
根据涂层超导应用对Ni5W合金基带织构的要求,分析研究了轧制方式、轧制工艺润滑、轧制速度等对Ni5W合金基带轧制形变织构及再结晶立方织构的影响,研究发现,往复轧制避免了不利于形成再结晶立方织构的其他冷轧取向的产生,进而在Ni5W合金基带中获得较多的C型和S型取向,利于退火过程中获得锐利的再结晶立方织构,对比分析了非润滑轧制和润滑轧制的再结晶晶界分布情况,发现非润滑轧制较润滑轧制产生的孪晶界含量少,且晶界质量比较高,并对3种不同轧制速度的轧制结果进行了分析,得出5 m.min-1为最佳的轧制速度。提出了相应的优化轧制工艺,为轧制基带的织构控制和性能优化提供参考,最终冷轧和退火后获得了长度为20 m,厚度为~63μm,立方织构含量达~99%(10°),性能均匀的Ni5W合金基带,为Ni5W合金基带长带的产业化生产奠定了基础。  相似文献   

2.
采用中试试验平台冷轧试验系统完成高磁感取向硅钢27QG090冷轧工艺探索研究,利用蔡司显微镜、X射线衍射仪分析实验室冷轧后试样的显微组织和宏观XRD织构。研究结果表明:不同压下率冷轧后高磁感取向硅钢27QG090显微组织为沿轧向伸长的纤维状组织,能够观察到不均匀变形区的剪切带。高磁感取向硅钢27QG090实验室冷轧后织构主要为α织构和少量{001}<110>旋转立方织构,冷轧规格优先选用0.27 mm和0.23 mm。工业试制冷轧板宏观织构为α织构和少量的旋转立方织构,主要集中在{114}<110>、{115}<110>织构,显微组织和织构均与实验室冷轧显微组织和织构一致。  相似文献   

3.
为了观察高强IF钢退火处理后的显微组织和再结晶织构的变化规律,采用两种不同退火工艺对高强IF钢进行热处理。结果表明,IF钢在两种退火方式下均形成了γ-{111}纤维织构,快速升温(350℃/min)退火时,再结晶新核呈等轴状,由变形带内的亚晶合并形成,与冷轧变形基体保持相同取向。慢速升温(2℃/min)退火时,新核在晶界弓出形成,且沿轧制方向呈饼形分布,与基体没有明显取向关系。慢速升温退火样品的γ-{111}取向密度强于快速升温的。对进一步改善薄板钢深冲性能具有指导作用。  相似文献   

4.
采用异步轧制将经过一次正常冷轧和中间退火的0.75mm厚的工业取向硅钢板材异步轧至不同的厚度,然后进行工业退火,研究剪切变形方式对板材织构和磁性的影响。结果表明:异步轧制下,作用于差轧区上的剪切应力能够有效地改善板材心部的织构组态,并在板材亚表层附近相对较大的区域内形成了理想的冷轧织构;退火后板材内重新形成了取向集中的Goss织构,其磁性均不低于常规轧制。  相似文献   

5.
摘要:采用取向分布函数和取向线分析法研究了初始随机分布的体心立方金属α-Fe经过不同轧制工艺的织构演变,.体心立方金属α-Fe经过普通同步轧制后,其织构组分主要为高斯织构。经过工艺改变的异步轧制后,材料发生强烈的剪切应变,与轧制固有的平面压应变共同作用,获得了完全不同于同步轧制织构组分的{100}面织构。  相似文献   

6.
研究“交叉轧制法”试制立方织构双取向硅钢时的冷轧压下工艺,发现冷轧纵横向压下率比对成品磁性能的影响很大。当纵横向冷轧压下率比控制在1.380-1.450时,最利于最终成品中强而锋锐的立方织构{100}〈001〉形成。  相似文献   

7.
利用异步轧制技术对高压电解电容器用高纯铝进行冷轧,研究了异步轧制参数对铝箔冷轧织构的影响.结果表明:异步轧制的搓轧区效应,可使铝箔形成不同于同步轧制的6种主要织构的含量与分布.慢辊侧的织构总体含量高于快辊侧总体含量;S{123}(634)织构、C{112}(111)织构的变化趋势相同,立方织构{001}(100)、旋转立方织构{001}(110)的变化趋势相同;Goss织构含量较低,且对快慢辊、形变量、速比都不敏感.织构的体积分数对速比敏感,同时调整速比与终道次形变量,可提高冷轧织构的含量.结合实际要求形变量,速比控制在1.06和1.13,可获得含量高于同步轧制的冷轧织构.  相似文献   

8.
评述了铁硅合金中通过二次再结晶获得立方织构的一些基本规律。从变形与再结晶织构形成的机理 ,讨论了二次再结晶时立方“晶核”的获得 ,以及 (hk0 ) [0 0 1 ]初次再结晶织构的获得 ;当杂质偏聚或第二相沉积在晶界上后 ,由于不同取向晶粒间构成的晶界特性不同 ,对晶界迁移速率的影响会有很大的差别 ,讨论了获得取向合适的初次再结晶织构的重要性 ;从杂质原子在表面吸附后会降低 ( 1 0 0 )晶面的表面能 ,促使立方晶粒在最后退火时长大 ,讨论了退火气氛的重要性。根据这些原则 ,可以指导如何确定冷轧次数、冷轧变形量、中间退火温度以及最后退火温度和气氛 ,以便获得更集中的立方织构。  相似文献   

9.
《铝加工》2021,(3)
利用金相显微分析、蚀坑腐蚀等方法研究了不同退火工艺对用偏析法提纯和三层液法提纯两种不同精铝原料配比生产的高压阳极铝箔再结晶组织及表面晶粒大小、取向、形貌及分布的影响。结果表明:再结晶组织主要由立方织构组成,偏析法提纯生产的阳极箔在300℃保温1 h完成再结晶,立方织构占有率趋于最大值,三层液法提纯的阳极箔在350℃保温1 h完成再结晶,立方织构占有率达到最大值;偏析法提纯的阳极箔最佳退火工艺为300℃×1 h+510℃×10 min,三层液法提纯的阳极箔最佳退火工艺为:350℃×1 h+510℃×10 min;510℃下退火时间过长会引发晶粒粗大,减少立方织构的含量。  相似文献   

10.
作为制备高温超导涂层导体的金属镍基带,需要具有良好的立方织构,而轧制变形量和退火温度对金属镍基体立方织构的形成有很大的影响。采用电子背散射衍射(EBSD)技术研究了不同预退火温度对冷轧形变量为89%的Ni-5%W(原子分数)合金立方再结晶织构的影响。样品先在300和670℃预退火1 h,然后经10%小变形量冷轧,最后在900℃退火1 h。结果表明:预处理温度对于立方再结晶织构的形成有重要的影响,经300℃预回复和670℃部分再结晶退火之后的样品在最终退火后都形成了较高含量的立方织构,且预退火温度对立方晶粒的形核、数量和尺寸有重要作用,经部分再结晶退火之后的样品在最终退火后形成的立方织构含量明显高于经预回复的样品。分析认为,预回复和部分再结晶样品经小变形轧制后,使立方取向晶粒回复加快,增加了立方取向晶粒形核的优势,从而促进立方再结晶织构含量的增加。与此同时,由于部分再结晶预退火比预回复退火形成的立方晶核多,再经小变形量轧制后,通过尺寸优势和应变诱导晶界移动机制(SIBM),部分再结晶预退火得到更多的立方晶粒。  相似文献   

11.
Samples of a ferritic stainless steel sheet were hot‐rolled with and without application of lubrication. The effect of the different hot rolling processes on the evolution of texture and microstructure after hot rolling, cold rolling and subsequent recrystallization annealing was studied by means of macro and micro‐texture analysis and microstructure observations. After hot rolling, the sample rolled with lubrication displayed uniform rolling textures through the sheet thickness, while the sample rolled without lubrication showed shear textures in the outer layers of the sheet. The finite element method was employed to reveal the strain states during hot rolling with and without lubrication. The texture of the hot rolled sheet strongly influenced the formation of texture after cold rolling and final recrystallization and, therewith, planar anisotropy as well as the severity of ridging of the final gauge sheet. Hot rolling with lubrication was beneficial to the formation of strong recrystallization textures through the whole thickness layers leading to an enhanced planar anisotropy of the sheet. The recrystallized sheet hot‐rolled without lubrication displayed less severe ridging, however, which was attributed to a less frequent formation of orientation colonies in the outer thickness layers of the sheet.  相似文献   

12.
将热轧钢板在不同温度保温处理析出固溶元素后,在实验室四辊冷轧机上进行轧制,通过透射电镜观察(TEM)和三维取向分析(ODF),研究了热轧钢板中固溶元素的析出对冷轧织构的影响。结果表明:热轧钢板经700℃和1000℃保温处理后,其冷轧织构仍保持了非{111}织构特征;热轧板中固溶元素析出为二相粒子,有利于冷轧织构中{111}组分的增强,进而具有抑制非{111}织构组分的作用。  相似文献   

13.
借助电子背散射衍射(EBSD)及ZEISS-200MAT金相显微镜对某钢厂普通取向硅钢(CGO)进行研究,研究结果表明:热轧板组织、织构沿板厚方向存在明显的不均匀性,在热轧板表层及次表层发生再结晶,同时存在强度较高的Goss织构,中心层存在较强的{001}110变形织构。冷轧组织均呈纤维状条带组织,一次冷轧后,热轧板中的Goss织构消失,织构主要为α、γ织构,经中间脱碳退火后,α、γ织构强度减弱,并出现一定强度的Goss织构和利于Goss织构发展的{554}225、{332}113等织构,经二次冷轧后,二次冷轧织构类型与一次冷轧织构一致,但织构强度不同。  相似文献   

14.
3%Si钢(/%:0.067C、3.09Si、0.34Mn、0.007P、0.003S、0.70Cu、≤0.005Al、0.0080~0.0120N)由50kg真空感应炉冶炼,并在实验室轧机经6道次热轧成3.5mm板,终轧温度850℃,卷取温度650℃,热轧板经常化处理后由4辊可逆轧机6道次冷轧成0.50mm薄板。分析结果表明,热轧板表面主要为随机分布较大的等轴晶,中心处由细小等轴晶和长条状晶粒组成,并出现了很强的旋转立方织构{001}〈110〉。经过冷轧,薄板表面出现了很强的α织构和γ织构组分,并且冷轧板保留了热轧的{001}〈110〉旋转立方织构。  相似文献   

15.
 Texture inhomogeneity usually takes place in ferritic stainless steels due to the lack of phase transformation and recrystallization during hot strip rolling, which can deteriorate the formability of final sheets. In order to work out the way of weakening texture inhomogeneity, conventional hot rolling and warm rolling processes have been carried out with an ultra purified ferritic stainless steel. The results showed that the evolution of through-thickness texture is closely dependent on rolling process, especially for the texture in the center layer. For both conventional and warm rolling processes, shear texture components were formed in the surface layers after hot rolling and annealing; sharp α-fiber and weak γ-fiber with the major component at {111}<110> were developed in both cold rolled sheet surfaces, leading to the formation of inhomogeneous γ-fiber dominated by {111}<112> after recrystallization annealing. In the center layer of conventional rolled and annealed bands, strong α-fiber and weak γ-fiber textures were formed; the cold rolled textures were comprised of sharp α-fiber and weak γ-fiber with the major component at {111}<110>, and inhomogeneous γ-fiber dominated by {111}<112> was formed after recrystallization annealing. By contrast, in the centre layer of warm rolled bands, the texture was comprised of weak α-fiber and sharp γ-fiber, and γ-fiber became the only component after annealing. The cold rolled texture displayed a sharp γ-fiber with the major component at {111}<112> and the intensity of γ-fiber close to that of α-fiber, resulting in the formation of a nearly homogeneous γ-fiber recrystallization texture in the center layer of the final sheet.  相似文献   

16.

In this study, the effect of strain path on texture evolution during cold rolled and annealing of hot rolled Mg-Zn-Rare-Earth (RE) alloy (ZEK100) sheet has been investigated. Strain path during cold rolling has been varied by changing rolling direction with respect to the original hot rolling (HR) direction of the sheet. Cold rolling either parallel or perpendicular to the HR direction leads to spread and split of basal poles in the transverse direction (TD) during annealing, characteristic of Mg-Zn-RE alloys. However, when the sheet is continuously rotated between cold rolling passes, this texture spread is not produced. It is demonstrated that a change in dislocation activity, as predicted by crystal plasticity modeling, cannot explain the unusual textures developed in Mg-Zn-RE alloys. Instead, the role of strain path in determining shear band evolution is considered to be critical. When shear bands are suppressed by continuously rotating the specimen, the distinct Zn-RE texture is not produced. Furthermore, it is demonstrated the dominance of the TD spread grains emerges gradually during recrystallization, leading to the final observed texture.

  相似文献   

17.
Pure Ni and Ni alloy tapes with sharp cube texture and low-angle grain boundaries prepared by thermomechanical process were extensively used as substrates for coated conductor. The thermomechanical process usually includes hot forging and cold rolling. In this study, a hot-rolling process between hot forging and cold rolling was induced. The influence of hot rolling on the cube texture of pure Ni was discussed. Sharp cube texture on pure Ni was obtained by suitable hot rolling, cold rolling, and recrystallization treatment. This deformation texture of tape was studied using orientation distribution function (ODF). Orientation mapping, content of the cube texture, and grain boundary distribution were performed using an EBSD system mounted on LEO-1450 SEM. The results show that the substrates that are hot rolled have a sharp cube texture and low-angle grain boundaries.  相似文献   

18.
Textures and Properties of Hot Rolled High Strength Ti-IF Steels   总被引:1,自引:0,他引:1  
The texture evolution in a high strength Ti-IF steel during the processing of hot rolling, cold rolling, and annealing is studied. For comparison, both ferrite rolling and austenite rolling are employed. It is found that the texture type is the. same after ferrite rolling and austenite rolling, but the texture intensity is much higher in the ferrite rolled sample. Furthermore, texture characteristics at the surface are absolutely different from those at the mid sec tion in both ferrite rolled and austenite rolled samples, as well as under the cold rolled and annealed conditions. The shear texture { 110 } 〈001 〉 disappears and orientation rotates along { 110 } 〈001 〉→ { 554 } 〈 225 〉→ { 111 } 〈 112 〉→{111}〈110〉→{223}〈110〉 during cold rolling. Compared to the austenite rolled sample, the properties of the cold rolled and annealed sheet which is subjected to ferrite rolling are higher.  相似文献   

19.
The microstructural and texture evolution of cold rolled low stacking fault energy fcc Fe‐30Mn‐3Al‐3Si alloy was investigated as a function of the cold rolling strain. The alloy was melted and cast in a vacuum induction furnace, hot rolled and annealed before being cold rolled at three different strains: ε = 0.035, e = 0.2 and ε = 1.2. During the cold rolling process different deformation mechanisms became active depending on the strain. At low strain levels, ε = 0.035 and ε = 0.2, slip traces were observed whereas at higher strains shear bands appeared. The brass orientation {110}<112> spreading towards the Goss orientation {110}<001> was dominant at every strain level. The intensity of these texture components increased with increasing rolling strain. The increase of the brass component was more pronounced when e varied from 0.035 to 0.2, whereas the increase of the Goss component was more pronounced when ε varied from 0.2 to 1.2. Additional texture components developed: the E orientation {111}<110> lying on the γ‐fibre and the S orientation {123}<634> lying on the ß‐fibre. This evolution is comparable to other low SFE fcc materials exhibiting the brass‐type texture.  相似文献   

20.
热轧钢板的织构   总被引:2,自引:1,他引:1  
综述了热轧钢板织构的形成机制和形成特点,分析了化学成分、加热温度、终轧温度、轧制速度、轧后冷却速度以及润滑对热轧织构的影响规律,并描述了热轧织构对热轧板塑性应变比、屈服强度和韧性的影响特点,可为热轧钢板织构和性能的优化与控制提供依据。  相似文献   

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