热轧W80Cu20合金的织构演变分析

采用XRD织构测试仪在角度为0°~90°时测量W80Cu20合金及经多道次热轧后的不完整极图,应用三维取向分布函数(ODF)研究W-Cu合金热轧板材中织构的演变规律。结果表明:热轧前,W80Cu20合金的取向密度值接近1,织构强度很弱,取向不明显,认为没有织构出现;W80Cu20合金轧制变形后,织构强度增加,表现出明显的轧制织构特征,择优取向明显,织构的取向密度值较大,形成稳定的织构组分:Brass型织构取向{110}<112>、Copper型织构取向{211}<111>和旋转立方织构取向{200}<011>。     

Textures variation of 3104 aluminum alloy sheets under different rolling conditions

1　INTRODUCTIONLargequantityoftheAl Mn Mgalloy 310 4isusedinthemanufactureofaluminumbeverage .Muchattentionwaspaidtothecontroloftextureandearinginthedeepdrawingstagesofmanufacture .Thetex tureinthecanstockwasextensivelyinvestigated .Oneearingofaluminumalloyisverycloserelatedtothetexture ,agoodassociationofthetexturescompo nentsearingdropsobviously ,inthissituationthe 4 foldearingat 0°/90°andearingat± 4 5°occursto gether[15] .Theappearanceof 4 foldearingat 0°/90°isduetothecubetext…     

Effect of deformation texture on the anisotropy of elasticity and damage of two-phase steel sheets

The effect of small tensile deformation (3, 6, and 10%) on the texture of preliminary annealed sheets of two-phase DP600 steel (0.10 C, 0.15 Si, 1.4 Mn, 0.007 P, 0.008 S, 0,009 N, 0.02–0,06 Al, 1 Cr–Mo–Ni (wt %)) is studied. Against the background of the annealing texture in the sheets, the {001} <110>, {111} <110>, {111} <112>, {111} <312> components of the slip texture and {115} <110>, {115} <552>, {221} <110>, {221} <114> orientations are developed, which can be associated with the twinning processes. The anisotropy pattern of the Young’s modulus (E) in the sheet plane remains the same after tensile deformation of the annealed sheets. After tension, the values of E decrease in all directions as a result of the onset and development of microdamages. The anisotropy of damage (D) in the plane of the steel sheets after tension is characterized by a maximum in the transverse direction (TD) and a minimum in the rolling direction (RD).     

深冲SPCE与超深冲IF钢r值差异的ODF分析

用取向分布函数（ＯＤＦ）方法对造成ＩＦ钢板与ＳＰＣＥ钢板ｒ差异的织构因素进行了分析。结果指出，由于铁素体中间隙原子存在状态不同经冷轧后冷轧织构不同，进而经退火后退火织构不同，ＩＦ钢的退火织构以｛１１１｝＜１１０＞、｛１１１｝＜１１２＞织构为主，ＳＰＣＥ钢的退火织构以｛００１｝＜１１０＞织构为主。｛１１１｝取向晶粒的ｒ大于｛００１｝取向晶粒的ｒ值，因而超深冲ＩＦ钢有比深冲ＳＰＣＥ钢板高的ｒ值。     

Analysis of deformation textures of asymmetrically rolled aluminum sheets

Asymmetric rolling, in which the circumferential velocities of working rolls are different, imposes shear deformation and in turn shear deformation textures to sheets through the thickness. A component of ND//〈111〉 in the shear deformation textures can improve the plastic strain ratios of aluminum sheets. In order to understand the evolution of ND//〈111〉, the strain histories and distributions in the sheets and the texture evolution during the asymmetric rolling have been measured and calculated. The shear deformation texture can vary with the ratio of shear to normal strain increments. As the ratio increases from zero to infinity, the texture moves from the plane strain compression texture (β fiber) to the ideal shear deformation texture consisting of {001}〈110〉, {111}〈110〉, and {111}〈112〉. The ratio increases with rolling reduction per pass in asymmetric rolling. However, it is practically difficult to develop a rolling reduction per pass high enough to obtain the ideal shear deformation texture. Imposing the positive and negative shear deformations on the sheet by reversal of the shearing direction can give rise to the ideal shear deformation texture.     

Texture development of deep drawn aluminum cups

The differently heat-treated aluminum sheets (fully recrystallized or partially recrystallized) of 1 mm thick were deep drawn from a round shape with 60 mm diameter to a drawing ratio of 1.8. The initial texture of the fully recrystallized Al-sheet can be described by a very strong {001} <100 > cube texture and a weak beta-fiber component. The initial texture of the partially recrystallized Al-sheet consisted of the cube and the beta-fiber components with same amount of fraction. Ears with 2 mm height formed at 0° and 90° to the initial rolling direction in the drawn cup of the fully recrystallized sheet. And by partially recrystallized sheet the ears were found at 0° 45° and 90° After deep drawing, the maximum intensity of ODF was reduced to ca. 25% of the initial one by the fully recrystallized sheet and ca. 50% by the partially recrystallized sheet. The spread ranges of the orientation components were expanded. The sharp cube component of initial texture remained after deep drawing but the weak beta-fiber disappeared by the fully recrystallized sheet and some other components are formed by the partially recrystallized sheet.     

新能源汽车用含稀土无取向硅钢生产过程中组织、织构演变

采用光学显微镜、X射线衍射仪及扫描电镜对含稀土无取向硅钢整个生产流程中的显微组织及织构演变进行研究。结果表明,热轧板在厚度方向上有显著的分层,即表层的再结晶层、过渡层、中间层的变形组织层,其织构主要包含铜型、黄铜型织构;正火后晶粒发生了完全再结晶,织构类型相对热轧基本无变化,但强度减弱;两次冷轧后的组织均为纤维组织,形成了以α、γ线性织构为主的织构类型,还出现了强度较高的反高斯织构如{001}<110>、{112}<110>、{111}<110>;脱碳退火后发生部分再结晶,织构相对于冷轧态α、γ线性织构强度均减小;在高温退火阶段晶粒发生再结晶,存在以{111}<112>、{111}<110>为主的γ织构,以及{100}<001>织构。     

390MPa级超低碳BH钢织构演变规律

采用ODF织构分析方法,对390 MPa级超低碳BH钢板热轧、冷轧、退火过程织构演变规律进行研究,并对不同冷轧压下量和不同退火工艺织构进行分析。结果表明:经冷轧变形后的钢板有较强的择优取向,具有典型的{112}<110>和{111}<110>织构,形变织构中的不利织构{001}<110>较强;冷轧压下率为80%时再结晶退火后钢板具有较强的γ织构,{111}<112>织构取向密度高达11.7;退火温度和保温时间对α织构影响不大,提高退火温度和延长保温时间使γ织构增强,r值增加。     

Texture and mechanical properties of Al-0.5Mg-1.0Si-0.5Cu alloy sheets manufactured via a cross rolling method

The relationship between the texture and mechanical properties of 6xxx aluminum alloy sheets processed via cross rolling was investigated. The microstructures of the conventional rolled and cross rolled sheets after annealing were analyzed using optical micrographs (OM). The texture distribution across the thickness in the Al-Mg-Si-Cu alloy, conventional rolled sheets, and cross rolled sheets both before and after annealing was investigated via X-ray texture measurements. The texture was analyzed in three layers from the surface to the center of the sheet. The β-fiber texture of the conventional rolled sheet was typical of the texture obtained using aluminumoll ring. After annealing, the typical β-fiber orientations were changed to recrystallization textures: cube{001}〈100〉 and normal direction (ND)-rotated cubes. However, the texture of the cross rolled sheet was composed of an asymmetrical, rolling direction (RD)-rotated cubes. After annealing, the asymmetrical orientations in the cross rolled sheet were changed to a randomized texture. The average R-value of the annealed cross rolled sheets was higher than that of the conventional rolled sheets. The limit dome height (LDH) test results demonstrated that cross rolling is effective in improving the formability of the Al-Mg-Si-Cu alloy sheets.     

冷轧变形量对Al-Mg-Si合金织构的影响

利用光学显微镜、扫描电镜分析了不同冷轧变形量对Al-Mg-Si合金显微组织和微观织构的影响。结果表明:随着变形量的增加,再结晶织构Cube{001}<100>会经由Goss{011}<100>逐渐演变为以Copper{112}<111>和S{123}<634>为主要取向的形变织构,而Goss{011}<100>的体积分数表现为先增大后减小的趋势;合金形变带织构主要由强度较高的Copper{112}<111>织构和强度较弱的Cube{001}<100>织构组成;当变形量小于20%时,晶粒主要取向为{001}、{012},变形量大于40%时,{011}、{112}、{123}成为主要的晶粒取向。     

Texture Evolution Behavior and Its Triggered Mechanical Anisotropy of CP Ti During Severe Cold Rolling and Subsequent Annealing

The texture evolution behavior and its triggered mechanical anisotropy of commercially pure titanium(CP Ti) during severe cold rolling and subsequent annealing are discussed based on the optical microscopy and the electron backscattered diffraction analyses. Some enlightening results are found. It is shown that planar textures exist under all treatments, namely the {11–29}10–10 under rolling state, the {11–27}10–10 under 300 °C annealing state and the {11–24}10–10 under 500 °C annealing state. This indicates that the crystal plane indices of planar texture change toward {-12–10} with increasing annealing temperature, which is a result of crystal lattice rotation. Planar texture triggers anisotropy of the mechanical properties for CP Ti sheets under all treatments. In particular, CP Ti sheets exhibit severe and similar anisotropy behavior under rolling and 300 °C annealing states. Generally speaking, the rolling direction(RD) specimens get relatively low yield strength, high ultimate tensile strength and good plasticity, and RD + 45° specimens show relatively high yield strength, low ultimate tensile strength and good plasticity. The transverse direction specimens, however, usually exhibit high yield strength and low plasticity. It is proved that the above anisotropy behavior is mainly determined by the Schmid factor distribution of the(10–10)[11–20] prismatic slip system in different directions. Due to the non-negligible influence exerted by the(0001)[11–20] basal slip system after 500 °C annealing, the anisotropy behavior under this state is obviously different.     

Fe83Ga17R0.6(R=Ce,Tb和Dy)合金的微结构与磁致伸缩性能

为改善多晶Fe-Ga合金的磁致伸缩性能,在Fe-Ga合金中掺杂稀土Ce、Tb和Dy元素。 研究了Fe83Ga17和Fe83Ga17R0.6 (R=Ce、Tb和Dy)合金的结构和磁致伸缩性能。结果表明,Fe83Ga17合金由单一bcc结构Fe(Ga)固溶体相组成,而掺杂稀土后的Fe83Ga17R0.6合金中除保持bcc结构的Fe(Ga)固溶体相外,还出现了R2Fe17第二相。掺杂稀土后的Fe83Ga17R0.6合金磁致伸缩系数明显大于Fe83Ga17合金。掺杂不同种类的稀土元素对Fe-Ga合金磁致伸缩性能改善的程度不同。在外磁场为557 kA/m时,Fe83Ga17Ce0.6合金的磁致伸缩系数(206×10-6)明显大于Fe83Ga17Tb0.6 (165×10-6)和Fe83Ga17Dy0.6 (161×10-6)合金的磁致伸缩系数。     

SPATIAL ORIENTATION DISTRIBUTION OF CRYSTALLITES IN COLD-ROLLED Al-KILLED STEEL SHEET DURING RECRYSTALLIZATION ANNEALING

用晶体取向分布函数研究了含0.13％Cu的低碳镇静钢冷轧薄板再结晶退火过程织构的变化。结果表明,冷轧织构主要为平行于板面法线的<111>纤维织构组分和{001} <110>组分;此两组分的漫散构成平行于轧向的<110>部分纤维织构。在再结晶过程中<111>纤维织构增强,{001} <110>组分减弱,因而<110>部分纤维织构也逐渐收缩,表明它不是一个独立的织构组分。     

柱状晶对Fe-3%Si电工钢冷轧织构演变规律的影响

Fe-3%Si电工钢铸锭中普遍存在柱状晶,其晶体学及形状各向异性对随后的热轧、冷轧及退火织构产生很大的影响.利用xRD与EBSD技术对长轴分别平行于轧面法向(ND),轧制方向(RD)和横向(TD)的柱状晶冷轧样品的织构及组织进行了研究,并对晶界的特殊作用进行了分析.结果表明,中等压下量下,3种柱状晶样品具有不同程度的{001}织构遗传性,即3种样品均不同程度的摆脱了{111}线织构的形成;柱状晶长轴平行于ND和TD时,{001}取向在冷轧时得到大的保留;柱状晶长轴平行于RD时,得到最强的{111}〈112〉织构;柱状晶长轴平行于TD时,冷轧组织中旋转立方织构及{111}〈110〉织构较强.此外,3种样品的织构均表现出由立方→{001}〈130〉→{113}〈251〉的过渡路径,与等轴多晶样品沿α线和γ线转动的路径不同.不同方向的柱状晶晶界对冷轧变形过程中晶粒转动的作用不同,但因晶粒尺寸大而作用有限,且与初始取向相关.     

Effect of Asymmetric Hot Rolling on the Texture Evolution of Fe–3%Si Steel

In Fe–3%Si steel, the hot rolling process affects not only the hot rolling texture but also the primary recrystallization texture. Here, the effect of asymmetric hot rolling was studied by comparing the difference in the texture evolved between asymmetric and symmetric hot rolling. The effect of asymmetric hot rolling on the texture of primary recrystallized Fe–3%Si steel was also studied. The symmetric hot rolling of Fe–3%Si steel produces a rotated cube texture at the center but Goss and copper textures near the surface. Asymmetric hot rolling tends to produce Goss and copper textures even at the center like the texture near the surface. After primary recrystallization, the dominant texture at the center changes from {001} <210> to {111} <112> and the new texture has a higher fraction of the grains which make the low energy boundary with Goss grains than that of symmetric hot rolling.     

Creation of a sharp cube texture in ribbon substrates of Cu–40% Ni–<Emphasis Type="Italic">M</Emphasis> (<Emphasis Type="Italic">M</Emphasis> = Fe,Cr, V) ternary alloys for high-temperature second generation superconductors

The structure and the process of texture formation in ribbons made of Cu–Ni–M (M = Fe, Cr, V) ternary alloys have been studied upon cold rolling deformation to a degree of ~99% and subsequent recrystallization annealing. The possibility of obtaining a perfect cube texture in a thin ribbon made of copper–nickel-based ternary alloys with additives of iron, chromium, and vanadium has been shown, which opens the prospects of the use of these alloys as substrates in the technology of production of tapes of high-temperature second-generation superconductors. Optimal annealing regimes have been determined, which make it possible to obtain a perfect biaxial texture close to single-crystalline one with the content of cube-oriented grains {001}〈100〉±10° more than 99% on the surface of the textured ribbon.     

SiCp增强铝基复合板材力学性能与晶粒取向分布

研究了粉末冶金法制备的ＳｉＣｐ增强铝基复合板材在热轧和冷思状态下的力学性能及板材中的晶粒取向分布,结果表明,热轧板材抗拉强度及塑性明显高于冷轧态,屈服强度则氏于冷轧态。冷轧板织构主要包含微弱的剪切织构｛００１｝〈１１０〉和两个常的面心立方金属织构组分｛１１０｝〈１１２〉及｛３３１４｝〈７７３〉;而热轧板织构近乎无规分析,晶粒取向的择优对复合板材的屈服强度有一定影响,与抗拉强度无关。冷轧板抗拉强度的     

Microstructure and texture development of pure aluminum and aluminum alloy processed by high speed hot rolling

The microstructure and texture development of pure aluminum and aluminum alloy processed by high speed hot rolling are investigated. The aluminum sheets are rolled at temperatures ranging from 410°C to 560°C at a rolling speed of 15m/s without lubrication and quenched into water at an interval of 30 ms after rolling. The redundant shear strain induced by high friction increases beneath the surface at a reduction above 50% for Al alloy (AA5052) and above 60% for pure Al (AA1050). Dynamic recrystallization occurs in the surface region when the equivalent strain exceeds a critical value that depends on rolling temperature, while only recovery occurs in the center region. The critical equivalent strain for the occurrence of recrystallization in AA5052 is lower than that in AA1050. When the large strain is introduced beneath the surface, the shear texture, the main components of which are {001}<110> and {111}<110>, develops. In the center region, Cu-orientation and cube orientation develop. The shear texture beneath the surface is weak when recrystallization occurs.     

Effect of the hot-rolling microstructure on texture and surface roughening of Al-Mg-Si series aluminum alloy sheets

This study investigates the effect of microstructural changes induced by hot rolling on the formation of the texture in high-strength aluminum alloy sheets used in automotive applications. Fully (S2) and partially (S1) re-crystallized samples were fabricated by controlling the final hot-rolling temperature. Optical microscopy (OM) was used to observe the microstructure of the transverse direction (TD)-plane of the hot-rolled strips, and the electron back-scattered diffraction (EBSD) technique was used to evaluate the texture of the normal direction (ND)-plane of the finished sheets that were subjected to hot rolling, followed by cold rolling and a solid-solution heat treatment (SSHT). The grains in S1 showed a low-angle grain boundary, and the concentrations of Cube {001}〈100〉 and Goss {011}〈100〉 orientations were detected at different sheet thicknesses. In contrast, a randomized texture was observed in S2. On the basis of the above results, this paper discusses how the microstructure and texture achieved after hot rolling can influence the final microstructure, texture and surface roughening behavior.