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。     

异步轧制对高纯铝箔冷轧织构的影响

通过异步轧制，对高纯铝箔微取向流变行为进行了研究，结果表明，异步轧制与同步轧制的冷轧织构有较大差异，高纯铝箔在异步轧制下慢辊和快辊两侧的织构类型明显不同，尤其是旋转立方织构{001}{110}在含量上的差异更大，快辊侧随形变量的增中冷却织构主要为：S织构和{102}{uvw}织构，而慢辊侧则主要为：旋转立方织构{001}{110}，慢辊侧的旋转立方织构在相同的速比、相同的形变量下一般要大于快辊侧的旋转立方织构。     

横轧3 104铝合金变形织构的研究

应用极图分析及织构定量计算的方法，研究了横轧对3104铝合金变形织构的影响，结果表明：在与常规轧制相同压下量的横向轧制下，3104铝合金中的｛112｝，｛213｝丝织构体积百分数均低于常规轧制时各组分的体积百分数，而横向轧制则使得｛102｝丝织构增加较多，在横向轧制过程中出现强旋转立方织构和新｛110｝＜557＞取向的织构。     

3104铝合金冷轧变形织构的分析

通过对3104铝合金冷轧板的三维取向分布函数(ODF)的测算,研究和分析了该材料的织构类型与分布规律。结果表明:在冷轧过程中,所有样品的冷轧织构表现为典型的铜式(Copper-type)织构特征,其织构组分为C{112}〈111〉+B{110}〈112〉+S{123}〈634〉,随变形量的增加,织构由弱到强,最后稳定在铜织构C、黄铜织构B和S织构三个织构组分;{100}〈001〉立方织构在冷轧板中含量较弱,不足以与轧制织构相平衡。     

异步轧制对3004铝合金变形织构及制耳率的影响

以３００４铝合金为实验材料，研究了异步轧制对该合金的变形织构以及相应的制耳率的影响。实验表明：异步轧制和同步轧制板的主要变形织构是相同的，均为纯铜型织构｛１１２｝＜１１１＞＋｛２１３｝＜３６４＞＋｛１１０｝＜１１２＞，但异步轧制产生的变形织构较同步轧制的强度高，且随异步轧制速比的提高而增强。同时，异步轧制的板材中还出现｛００１｝＜１１０＞织构。另外，在相同压下率的情况下，异步轧制板材的深冲制耳率均大于同步轧制的制耳率     

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.     

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。     

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。     

3104铝合金固溶及时效处理后的冷轧织构

应用取向分布函数（ODF）研究了3104铝合金经不同温度固溶及时效处理后的冷轧织构组态。结果表明：经固溶时效处理后其冷轧织构中存在强度较高的旋转立方织构v{001}〈110〉组分,此外也含有一定强度的c{112}〈111〉、B{110}〈112〉和S{123}〈634〉织构组分,明显不同于未经固溶时效直接冷轧样品的织构组态特征。可能的原因是经固溶和时效处理后溶质原子和析出相粒子形态和数量的变化,它们在变形过程阻碍了位错滑移,使晶粒转动受阻,进而使不稳定取向旋转立方织构被不同程度的保留下来;此外,固溶温度越高,冷轧样品中不稳定取向旋转立方织构组分取向密度越小,时效温度对后继冷轧织构的影响也应归结为析出相粒子在变形过程中对位错滑移的阻碍,进而影响晶粒转动。     

横轧3105铝合金织构演变的定量分析

采用X射线衍射仪研究3105铝合金在横轧过程中织构的演变.结果表明:3105铝合金热轧板材具有强的β纤维轧制织构,在横轧过程中B'{110}<111>、S"{123}<17229>和C"{112}<110>取向是不稳定的,它们将逐渐向新的坐标系中β纤维的位置旋转;随横轧压下量增大,C(和S(取向强度快速降低,B(取向强度先增加后降低,而β纤维轧制织构的强度逐渐增加;β纤维和剩余组分织构体积分数的变化与轧制真应变的关系遵循Avrami方程,强的初始B'、S"和C"织构显著地提高了β纤维织构的形成速率.     

润滑对3104铝合金板变形织构的影响

在无润滑(WOL)和润滑(WL)2种轧制条件下,分别对2.3 mm厚的热轧3104铝合金板进行不同压下量的冷轧.应用取向分布函数(ODF)定量计算和分析在不同轧制压下量下润滑对3104铝合金板材沿板厚方向织构演变的影响.结果表明:随着轧制压下量的增加,样品各层的织构组分强度均逐渐增加;无润滑轧制时样品表面层主要织构组分取向密度普遍高于相同压下量下润滑轧制时的取向密度.导致表面层织构组分增强的原因是摩擦引起应变状态改变的结果.     

润滑剂对高纯铝形变织构的影响

采用ODF法（晶体取向分布函数法）研究和分析了润滑剂对高纯铝冷轧形变织构的影响,揭示了两种润滑条件下形变织构的演变规律。结果表明:大冷轧变形程度下,采用机油润滑,形变织构为典型的面心立方金属的轧制织构,即由强的B-、Cu-及S-织构组分构成,而且取向分布的密度峰值处在S-取向位置;煤油润滑时轧制织构相对较弱,但Cu织构最强,同时产生了明显的剪切织构{001}<110>（Rot.Cube-织构）。采用机油润滑时,轧制变形比较均匀。低变形轧制时晶粒取向聚集于α线,随变形量的增加,向β线取向聚集,大变形量下最终形变织构为铜型轧制织构;而煤油粘度小,轧制过程中接触表面摩擦因数较大,不均匀变形严重,低轧制程度时发现有表面剪切Rot.Cube-织构,随着塑性变形的增大,Rot.Cube-织构逐渐向Cu-取向转化;变形至95％后,随着变形程度的增加,S-织构减弱。     

冷轧方式和退火温度对Al-4Cu-0.73Mg合金织构和微观组织的影响

采用硬度测试、X射线衍射(XRD)、电子背散射衍射(EBSD)等方法研究了单向轧制、交叉轧制和退火温度对Al-4Cu-0.73Mg(wt%)合金织构演变和微观组织的影响。结果表明:单向轧制试样在100~300 ℃退火保温1 h后显示出明显的Copper织构{112} <111>、S织构{123} <634>和Brass织构{011}<211>,而交叉轧制试样表现出强烈的Brass织构和H织构{011}<755>。当退火温度高于300 ℃,单向轧制和交叉轧制试样中的变形织构逐渐沿α取向线转变为由P织构{011}<001>、L织构{011}<011>、E织构{111}<110>和R织构{124}<211>等组成的再结晶织构。单向轧制和交叉轧制试样的晶粒尺寸随退火温度的升高先增加后减小,均在350 ℃退火1 h后有最大晶粒尺寸,分别约为8.2 μm和11.5 μm。单向轧制和交叉轧制试样均在冷轧后硬度值最高,约为108 HV,之后硬度值随退火温度的升高而逐渐下降,两种轧制试样的硬度值最终均稳定在50 HV左右。总体来看,轧制方式对试样织构的影响比对力学性能的影响大。     

INFLUENCE OF COLD ROLLING TECHNOLOGY ON TEXTURE EVOLUTION OF IF STEEL

1．Illtroduct!onWhilst the metallurgy of*theurgy warm rolling ofIF steel In the ferrlte region has beenextensively studied 11,2],that ofcold rolling has not received the same amouM ofattentlon．This is probably because there has been less cold rolling tec…     

Texture Evolution in an Al-Cu-Mg Alloy During Hot Rolling

The texture evolution in the intermediate (the 1/4 thickness) layer of hot-rolled Al-Cu-Mg alloy sheets was investigated by the x-ray diffraction technique, electron backscattered diffraction analysis and transmission electron microscopy observation. The results showed that a texture transition from the shear texture {001}<110> to the β-fiber textures occurred as the rolling temperature increased to 420 °C. The shear strain caused by friction resulted in this strong shear texture formation at the low rolling temperature. As the rolling temperature increased, the plane strain substituting the shear strain dominated in the intermediate layer, giving rise to a significant increase in the β-fiber textures. Increasing the rolling temperature was found to preferentially activate the non-octahedral {112}<110> slip system, thereby benefiting the development of strong Brass. At the low rolling reduction of 74%, the textures with low intensity tended to converge on the α-fiber, containing Goss, Brass, P and L components. As the rolling reduction increased to 90%, the textures were strengthened and gradually flew toward the β-fiber, containing Brass, Copper and S components. The S and Copper bands were found to be the preferential sites for the development of recrystallizing Cube grains during hot rolling.     

轧制方向对Fe-3％Si合金织构演变规律的影响

形成锋锐的Goss织构是取向硅钢获得优异磁性能的关键, 初始样品表层中较强的Goss织构对最终的强Goss织构起重要作用. 本文通过改变硅钢冷轧方向获得不同的初始织构及初始组织, 考察热轧板表层及中心层不同的组织及织构的进一步变化对一次冷轧、中间退火、二次冷轧及脱碳退火、二次再结晶退火后的织构及组织变化规律的影响. 探讨了这些特殊方式制备的样品中Goss织构的形成条件. 结果表明, 强烈的初始组织及织构的差异随轧制及退火次数的增多逐渐消失; 最终二次再结晶都可顺利进行, Goss织构及磁性能差异并不大. 虽然初始样品中Goss织构的强弱差异很大, 但因各阶段都可以形成较强的 {111}<112>织构, 弥补了初始样品中Goss织构过弱的不足, 因此轧制方向及初始组织都对最终的织构影响不大. 研究还证实了立方织构的遗传性; 横向轧制是消除稳定的{112}<110>轧制织构的有效方法.     

Effects of cross rolling on texture,mechanical properties and anisotropy of pure Mo plates

To clarify the influence of the deformation texture on the mechanical properties, pure Mo plates were processed by various cross rolling procedures, and the relation among texture, microstructure and mechanical properties was discussed. The results show that cross rolling of the Mo plates is beneficial for the formation of the rotated cube component, i.e., {001}〈110〉. The corresponding orientation density exhibits a positive correlation with the total rolling deformation and the current-pass deformation. When the total deformation is 96% or greater, the Mo plates form a texture orientation dominated by {001}〈110〉, whereas the γ-fibre texture becomes weaker and the cube texture {100}〈100〉 disappears completely. The presence of {001}〈110〉 has great effects on the properties of cross-rolled Mo plates, which is beneficial for strength enhancement and plasticity reduction in both the rolling direction (RD) and the transverse direction (TD).     

Phase Transformation and Texture Evolution During Cold Rolling and alpha '-M Reversion in High Manganese TRIP SteelEI北大核心CSCD

To meet the requirement of environment, economy and safety, advanced high strength steels including dual phased (DP), complex phased (CP), transformation- induced plasticity (TRIP) and twinning-induced plasticity (TWIP) steels are widely used for automotive steel. Among them, high manganese TWIP and TRIP steels are particularly appealing due to their outstanding tensile strength and elongation. In contrast to high manganese TWIP steel, high manganese TRIP steel exhibits higher strength and work hardening rate due to strain induced martensitic transformation. The enhanced mechanical properties of high manganese TRIP steel are determined by both the stability of the retained austenite (gamma) and the initial microstructure. Strain induced martensitic transformation and subsequent reversion from deformed martensite to gamma during annealing is often applied as one of the most effective methods for microstructure improvement. Microstructure and texture characteristics of high manganese TRIP steel during cold rolling together with the reversion of deformed bcc martensite (alpha'-M) at high temperature were investigated. It is shown that the gamma was almost completely transformed into alpha'-M at medium cold rolling reduction. And a higher reduction after alpha'-M saturation resulted in dominantly the deformation of alpha'-M, hence thin laths paralleled to the rolling direction (RD) were obtained. The main components in alpha'-M were {113}< 110 >, {554}< 225 > and rotated cube ({001}< 110 >) textures at medium cold rolling reduction, which are the typical phase transformation textures. The {113}<110> texture rotated toward a more stable orientation {223}< 110 > and led to a strong cold rolling texture (< 110 >//RD) with increasing reduction. The reversion of martensite and recrystallization of gamma proceeded at temperature ranging from 650 degrees C to 850 degrees C. The reversion of alpha'-M proceeded in a diffusional mechanism, accompanying with the redistribution of Mn and Al between gamma and alpha'-M. Deformed alpha'-M was merged by the adjacent gamma, and columnar gamma grains with a large amount of subgrains were obtained. The texture of reverted gamma was approximately the same as that of the deformed gamma, this phenomenon called texture inheritance was formed by the direct growth of gamma. Subsequently, recrystallization of gamma grains occurred by sub-grain coalescence and the columnar g grains were instead by equiaxed gamma grains.     

高锰TWIP钢的冷轧变形行为

研究了低层错能奥氏体TWIP钢的冷轧组织和织构的演变。随着应变的增加,孪晶变形机制被激活。TEM、XRD等观察结果显示:随着应变量的增加,孪晶增加。在不同应变水平上,G{011}<100>织构都占主要位置。变形初始时,B{011}<211>织构强度较低,随着应变增加其强度显著增加。而E{111}<011>、Y{111}<112>、RG{011}<011>、Cu{112}<111>、CuT{552}<115>等织构在不同应变水平呈不同变化趋势。与其他织构相比,Cube{001}<100>织构强度相当低。     

轧制工艺对薄带铸轧无取向硅钢组织性能的影响

利用光学显微镜、XRD、EBSD等研究了轧制工艺对薄带铸轧无取向硅钢组织、织构和磁性能的影响。研究表明,随热轧压下率增大,冷轧组织变形储能及剪切带的比例逐渐降低,冷轧板中α织构减弱,γ织构增强。退火板晶粒尺寸随热轧压下率增大而增加。热轧压下率为17%及40%时,退火织构以强的Goss织构及相对弱的{100}织构为主,热轧压下率达到55%后,退火织构为强的{115}<110>和{114}<371>织构,Goss织构和{100}组分明显减弱。随热轧压下率增大,退火板磁感值先升高后降低,铁损值先减小后增加。热轧压下率为40%时,退火板综合磁性能最优。