New process for production of ultra-thin grain oriented silicon steel

The Hi-B silicon steels were cold rolled by cross shear rolling (CSR) with different mismatch speed ratio(MSR)s and conventional rolling(CR) respectively, followed by primary recrystallization annealing. The effects of MSR and annealing temperature on magnetic properties of ultra-thin grain oriented silicon steel were analyzed. Experimental results show that, with the increase of MSR, the magnetic properties can be remarkably improved. The higher the annealing temperature is, the higher the magnetic induction and the lower the iron loss in ultra-thin silicon steel is.     

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.     

异步轧制速比对3%硅钢织构转变的影响

采用不同的速比对取向硅钢进行异步冷轧,并在常规的生产条件下进行退火,研究速经对织构转变的影响。结果表明;速比对冷轧样品的表面及靠近快速辊侧的区域影响较小,但对心部的影响较大;速比的增加有利于样品两侧亚表层及心部织构组态的改善;     

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     

PRIMARY RECRYSTALLIZATION TEXTURES OF 70-30 BRASS ROLLED BY CROSS SHEAR ROLLING IN SINGLE DIRECTION

ＰＲＩＭＡＲＹＲＥＣＲＹＳＴＡＬＬＩＺＡＴＩＯＮＴＥＸＴＵＲＥＳＯＦ７０－３０ＢＲＡＳＳＲＯＬＬＥＤＢＹＣＲＯＳＳＳＨＥＡＲＲＯＬＬＩＮＧＩＮＳＩＮＧＬＥＤＩＲＥＣＴＩＯＮ￥ＺｈａｏＸｉａｎｇ；ＬｉｕＹａｎｓｈｅｎｇ；ＸｕＪｉａｚｈｅｎ；ＬｉａｎｇＺ...     

电工钢中黄铜织构行为及其对Goss织构的影响

本文通过EBSD取向成像技术检测追踪了取向硅钢热轧、脱碳退火及二次再结晶过程中黄铜取向晶粒的形成规律.结果表明,黄铜取向的形成是热轧时Goss取向在剪切力作用下向铜型取向转动受阻而绕法向转动的结果.与Goss晶粒和{111}〈112〉取向晶粒类似,黄铜取向和{111}〈110〉取向晶粒之间存在形变与再结晶相互转化的密切关系;二次再结晶时若抑制剂钉扎控制不当,在次表层的Goss晶粒快速长入中心层之前,黄铜取向晶粒已长成大尺寸并接触样品表面,随后的Goss大晶粒就很难吞并黄铜取向晶粒.     

高纯铝箔在异步轧制和再结晶过程中取向的演变

采用不同速比的异步轧制技术对99.99%的高纯铝板进行不同形变量的冷轧,并对冷轧样品进行不同温度和时间的再结晶退火.利用X射线衍射技术和TEM观测探讨了异步轧制条件下高纯铝箔中变形织构和再结晶织构的演变.结果表明:高速比的异步轧制(i=1.28)在样品中产生相对较强的旋转立方织构{001}(110).异步轧制后退火的高纯铝箔样品中,立方{001}(100)织构组分的再结晶晶核的形成和长大存在一个临界转变温度,此温度与异步轧制的速比成反比.异步轧制有利于降低高纯铝箔的再结晶温度,这与异步轧制提高高纯铝箔的形变储能有关.异步轧制有利于在低温时形成强的立方{001}(100)织构组分,但此时漫散较大;随着退火温度的升高,漫散范围明显缩至8°-10°.     

稀土元素Ce对取向硅钢热轧钢带组织和织构的影响

对2250 mm热轧生产线生产的取向硅钢热轧钢带的合金体系进行了设计,制定了合理的加热制度和热轧轧制工艺。对添加稀土元素Ce的取向硅钢铸坯和热轧钢带进行了分析,探究了稀土元素Ce对取向硅钢低倍组织、热轧织构及成品磁性能的影响。结果表明,稀土元素Ce能够细化取向硅钢连铸坯低倍组织和热轧显微组织,提高取向硅钢成品磁性能。     

短流程CSP和2250mm轧制生产50W600无取向硅钢组织及性能对比

针对短流程CSP和半连轧2250 mm两种不同热轧工艺所生产的50W600无取向硅钢,进行力学拉伸试验、显微组织观察及织构分析,研究两种工艺生产的无取向硅钢在组织状态和整体性能上的差异。结果表明:短流程CSP工艺生产的50W600无取向硅钢显微组织较为均匀,平均晶粒尺寸较2250 mm热轧工艺生产的粗大,热轧板力学性能略低。短流程CSP工艺生产的50W600无取向硅钢成品板酸轧、连续退火后不利织构相对较少,磁性能优于2250 mm热轧工艺生产的50W600钢。     

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。     

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。     

Effect of strain paths on development of shear textures during rolling in aluminum sheets

Two different types of shear textures were observed in cold rolled aluminum sheets after normal rolling without lubrication and after asymmetrical rolling carried out with the upper and lower rolls running at different velocities. Finite element simulations showed that the formation of the different shear textures could be attributed to differences in the strain history during rolling. The development of shear textures was quantified by assuming various idealized strain paths in polycrystal-plasticity deformation texture simulations. The net shear accumulating during a rolling pass plays an important role in determining the type of the resulting shear texture.     

Electron back scattered diffraction (EBSD) characterization of warm rolled and accumulative roll bonding (ARB) processed ferrite

An interstitial free (IF) steel was severely deformed using accumulative roll bonding (ARB) process and warm rolling. The maximum equivalent strains for ARB and warm rolling were 4.8 and 4.0, respectively. The microstructure and micro-texture were studied using optical microscopy and scanning electron microscopy equipped with electron back scattered diffraction (EBSD). The grain size and misorientation obtained by both methods are in the same range. The microstructure in the ARB samples after 6 cycles is homogeneous, although a grain size gradient is observed at the layers close to the surface. The through thickness texture gradient in the ARB samples is different from the warm rolled samples. While a shear texture (〈1 1 0〉//rolling plane normal direction (ND)) at the surface and rolling texture at the center region is developed in the ARB samples, the overall texture is weak. The warm rolled samples display a sharp rolling texture through the thickness with increasing the sharpness toward the center. These differences are attributed to the fact that the central region of ARB strip is comprised of material that was once at the surface. The ARB process can suppress the formation of shear bands which are conventional at warm rolled IF steels. EBSD study on the sample with 6th cycle of ARB following the annealing at 750 °C verified a texture gradient through the thickness of the sheet. The shear orientations at the surface and at the quarter thickness layers can be identified even after annealing. The overall weak texture and existence of shear orientations make ARB processed samples unfavorable for sheet metal forming in compare with warm rolled samples.     

Through-thickness shear strain control in cold rolled silicon steel by the coupling effect of roll gap geometry and friction

Through-thickness shear strain distribution in cold rolled non-oriented silicon steel under different roll gap geometries and friction coefficients was analyzed by finite element method (FEM). Cold rolling textures were also investigated quantitatively to validate the calculated shear strain distribution. The results showed that both direction and magnitude of shear strain through thickness depend sensitively on the two rolling parameters. The coupling effect of roll gap geometry and friction was satisfactorily explained based on their contributions to shear strain and the involved mechanisms. A shear strain distribution diagram (SSDD), which can clearly characterize the shear strain state with roll gap geometry, friction and through-thickness position as variables, was proposed to serve as a convenient tool for through-thickness shear strain control.     

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…     

Evolution of shear texture according to shear strain ratio in rolled FCC metal sheets

The shear textures developed in the surface layer by rolling procedures consist mainly of {001}<110> and {111}<uvw> orientations in FCC metal sheets, but the orientation components of shear textures vary with the rolling conditions. That is, either a single orientation component or a mixture of components can be developed depending on the rolling conditions. The purpose of this study is to analyze the various shear deformation textures in rolled FCC metal sheets.     

冷却方式对Nb-Ti微合金钢组织和性能及沉淀行为的影响

两阶段控制轧制后,采用不同的冷却路径进行冷却,研究冷却路径对Nb-Ti微合金钢组织和性能及沉淀行为的影响.结果表明,超快冷+空冷冷却路径可获得细晶组织,晶粒平均尺寸约为7.76μm,屈服强度高达425 MPa,抗拉强度高达500 MPa.超快冷+炉冷试样中存在细小的沉淀粒子,沉淀粒子尺寸主要集中在2—7 nm,而超快冷+空冷试样中只存在少量球形沉淀粒子,轧后直接空冷可获得相间沉淀粒子.不同冷却路径获得的热轧板在700℃下退火300 s后,沉淀粒子发生明显的粗化;退火处理后,超快冷+炉冷试样的晶粒平均尺寸减小为6.47μm,相对于退火前,其屈服强度和抗拉强度分别增加50和30 MPa、强度的增加主要源于细晶强化.对于含0.03%Nb(质量分数)的Nb-Ti微合金钢,由于沉淀粒子的体积分数有限,因此细晶强化效果远高于沉淀强化效果,强度的变化与晶粒尺寸的变化具有很好的对应性.另外,加工硬化指数与晶粒尺寸密切相关.随着晶粒平均尺寸的增加使加工硬化指数增加.     

冷却方式对Nb-Ti微合金钢组织和性能及沉淀行为的影响

两阶段控制轧制后,采用不同的冷却路径进行冷却,研究冷却路径对Nb-Ti微合金钢组织和性能及沉淀行为的影响.结果表明,超快冷+空冷冷却路径可获得细晶组织,晶粒平均尺寸约为7.76μm,屈服强度高达425 MPa,抗拉强度高达500 MPa.超快冷+炉冷试样中存在细小的沉淀粒子,沉淀粒子尺寸主要集中在2-7 nm,而超快冷+空冷试样中只存在少量球形沉淀粒子,轧后直接空冷可获得相间沉淀粒子.不同冷却路径获得的热轧板在700℃下退火300 s后,沉淀粒子发生明显的粗化;退火处理后,超快冷+炉冷试样的晶粒平均尺寸减小为6.47μm,相对于退火前,其屈服强度和抗拉强度分别增加50和30 MPa,强度的增加主要源于细晶强化.对于含0.03%Nb(质量分数)的Nb-Ti微合金钢,由于沉淀粒子的体积分数有限,因此细晶强化效果远高于沉淀强化效果,强度的变化与晶粒尺寸的变化具有很好的对应性.另外,加工硬化指数与晶粒尺寸密切相关,随着晶粒平均尺寸的增加使加工硬化指数增加.     

应用回归和神经网络方法预测热轧带钢性能

针对Q235B热轧带钢性能预测系统，提出一种回归分析和神经网络相结合的方法来预测其力学性能。首先，测量材料最终相的组成与铁素体的晶粒度，应用多重回归分析的方法，建立成分、相体积分数、晶粒尺寸与抗拉强度、屈服强度、延伸率的对应关系，另一方面，采用BP神经网络方法，结合相变动力学模型的计算数据，通过大量数据的自学习训练，完成神经网络模型对抗拉强度、屈服强度、延伸率的预测，预测结果表明，应用神经网络和回归分析方法，具有较高的预测精度。     

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。