EFFECT OF THE PROCESS PARAMETERS OF CROSS SHEAR ROLLING ON ROLLED TEXTURE AND MAGNETIC PROPERTY OF THIN GRAIN ORIENTED SILICON STEEL SHEETS

Commercial grain oriented silicon steels 0 30mm thick were cold rolled to thinner than mm by the cross shear rolling (CSR) and the conventional rolling respectively, then annealed in a normal hydrogen atmosphere furnace. The influence of the process parameters on rolled textures and the magnetic property of thin silicon steel sheets were investigated. The results indicated that the cross shear rolling was beneficial to improve the rolled textures and the magnetic property of the thin silicon steels. The amount of nucleus of Goss grain increased with increasing the mismatch speed ratio; in addition, magnetic properties were improved further with increasing reduction rate, meanwhile, rolled textures tend to well distributed through the thickness of the sheet.

Through Thickness Variation of Cross Shear Rolling Texture in Grain Oriented Silicon Steel

The texture inhomogeneity in cross shear rolled grain oriented Si steel was investigated by means of the through thickness texture analysis. For the chosen rolling reductions (55%, 66.5%) and mismatch speed ratios (1.0, 1.1, 1.3), the deformation textures in various thickness layers consist of three major components, i.e. strong γ-fiber, medium α-fiber and weak η-fiber, and they show an asymmetrical distribution throughout the thickness. The effect of reduction on the texture gradient is found to be more significant at and near the center layer; however, the effect of mismatch speed ratio is less important. In most cases, a strong {111}<112> texture component appears in the subsurface layers, that may favour the formation of a sharp Goss texture during the subsequent annealing.

Texture Characteristics of Thin Grain Oriented Silicon Steel Sheet Produced by Cross Shear Rolling

Commercial grain oriented silicon steel was cold rolled to thickness from 0.06 to 0.10 mm by cross shear rolling, then annealed in vacuum or a hydrogen atmosphere furnace. Deformation textures of the sheets were researched by ODF method and reverse pole figure quantitative analyses. The results indicate that: in the condition of the cross shear rolling, the deformation texture of rolled sheet is generally similar to that of conventional rolled sheet, however, the texture distribution through the thickness is asymmetrical. With mismatch speed ratio increasing, the amount of Goss texture increases. With reduction ratio increasing, the intensity of γ-fiber becomes strong.

Analysis of strain variation in cross shear zone of plate during snake hot rolling

In order to study the distribution of equivalent and shear strain of aluminum alloy plate during snake hot rolling, several coupled thermo-mechanical finite element models(FEM) are established. Effects of speed ratio and offset distance on strain distribution of the plate are analyzed. The length of cross shear zone is defined to have a better understanding of the deformation characteristic in cross shear zone, which is the essential difference from symmetrical rolling in deformation zone. The results show that the equivalent strain and shear strain of lower part both increase with the increase of speed ratio, while the upper part decreases; the equivalent strain through the whole thickness decreases with ascending offset distance, while the shear strain of lower part increases. The length of cross shear zone quickly increases with ascending speed ratio and slightly decreases with ascending offset distance. The "positive" and "negative" cross shear zones are formed with the increase of speed ratio and offset distance, respectively. The value of the sensitivity coefficient of speed ratio is an order of magnitude bigger than the offset distance. However, the shear strain at center point increases with the ascending speed ratio and offset distance for different mechanism. As speed ratio increases, the asymmetry of the distribution of equivalent is becoming larger and the shear strain is generated in the same direction in cross shear zone. The FEM results agree well with experimental results.

COLD ROLLING AND RECRYSTALLIZATION TEXTURE OF CROSS SHEAR ROLLED COMMERCIAL COPPER

The texture change along the normal direction to rolling plane of cross shear rolled commer- cial copper has been studied by means of two step method for ODF caleulation and computer simulation.The texture of cross shear rolling of copper is similar in primary components to that of conventional cold rolling,but the scattering degree and direction of the texture are dif- ferent,due to the residual shear strain change in different position along the normal to rolling plane.It seems that no more effect of the shear strain upon the recrystallization texture.

Textural Characteristic of 70-30 Brass Rolled by Cross Shear Rolling in Single Direction

70-30 brass is rolled with 90% reduction by cross shear rolling in single direction with speed ra- tio 1.39.The sheet is divided into five layers along rolling plane normal to measure macroscopic statis- tical unsymmetric textures in every layer are des- cribed and analysed by means of three dimensional orientation distribution function.The results indi- cate that the main textures in every layer of brass rolled by cross shear rolling in single direction are the same as the main textures of brass rolled by conventional rolling.But the intensities,peak posi- tions and scatters of every texture component in {110}<112>are different,namely,there is a macroscopic statistical unsymmetry.It is found that the textures in every layer of brass rolled by cross shear rolling in single direction can be considered as the textures of brass rolled by common rolling in single direction at identical shear forces,the macroscopic statistical unsymmetry depends on the shear forces which are exerted on the layer.

THE RELATIONSHIPS BETWEEN GLOBAL AND EVERY LAYER DEFORMATION TEXTURES OF 70－30 BRASS ROLLED BY CROSS SHEAR ROLLING

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

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Two-Dimensional Transient Temperature Field of Finish Rolling Section in Hot Tandem Rolling

The grain oriented silicon strip was rolled by cross shear rolling (CSR) and then annealed to manufacture non-oriented thin silicon strip of high quality. The recrystallization of rolled grain-oriented silicon steel into non-oriented silicon steel was studied. For this purpose, CSR is better than conventional rolling, and the higher the mismatched speed rate is, the better the properties of the non-oriented thin silicon strip are. The optimum annealing schedule is heating at 1 000 ℃ for 1 h in pure hydrogen atmosphere added with H 2S of 0.001 0 %.

Primary Recrystallization of Grain Oriented Silicon Steel Strip Rolled by CSR and Annealed in Magnetic Field

The magnetic properties and textures of grain oriented silicon steel with different thickness rolled by cross shear rolling （CSR） of different mismatched speed ratio （MSR） and annealed in magnetic field under hydrogen were presented.Effects of the factors such as thickness and mismatched speed ratio on the magnetic properties and recrystallization texture were analyzed and the recrystallization principles in magnetic field annealing were discussed. The study would provide a new route for mass production of high quality ultra-thin grain oriented silicon steel strip.

Textures variation of 3104 aluminum alloy sheetsunder different rolling conditions

The textures variation of 3104 aluminum alloy sheets during hot rolling, cold rolling, transverse cold rolling and cross shear rolling were investigated by means of X ray ODF analysis. The results show that the main texture component {100}<011> becomes stronger with the increase of hot rolling reduction. The cold rolling textures are composed of typical "copper type" texture components C {112}<111>, S {123}<634>, R/S {124}<211>, B {110}<112> and G {110}<001>, the orientation intensities increase with increasing cold rolling reduction. Compared to the conventional cold rolling with the same amount reduction, the transverse rolling reduces the orientation intensities of each cold rolling textures components, and strengthens the {001}<110> and {110}<uvw> texture components. During cross shear rolling process, notable difference of intensity of cold rolling textures components were observed from the slow roller side to the fast roller.

Non-Oriented Fe-Si Thin Strip Produced from Grain Oriented Fe-Si Strip by CSR

The grain oriented silicon strip was rolled by cross shear rolling(CSR)and then annealed to manufacture non-oriented thin silicon strip of high quality.The recrystallization of rolled grain-oriented silicon steel into non-oriented silicon steel was studied.For this purpose,CSR is better than conventional rolling,and the higher the mismatched speed rate is,the better the properties of the non-oriented thin silicon strip are.The optimum annealing schedule is heating at 1 000 ℃for 1hin pure hydrogen atmosphere added with H2 S of 0.001 0 %.

The unsymmetry global texture of 70-30 brass rolled by single directional cross shear rolling

There exists evident macroscopic statistical unsymmetry texture in every layer of 70-30 brass rolled by single directional cross shear rolling. There has been a consistent interest in how to measure and calculate this kind of unsymmetric global texture. Utilizing the previous composite sample methods, people can only describe a

异步轧制对表面纳米化316L不锈钢组织和性能的影响

采用表面机械研磨处理(SMAT)在316L不锈钢上制备出纳米结构表层,然后在室温对其进行80％形变量的异步 轧制(CSR),研究了CSR处理后表层组织和性能的变化.结果表明:经过60 min SMAT后,样品表面形成了一定厚度的纳 米晶层,晶粒尺寸为10-30 nm.对其进行80％形变量的CSR后,表层组织仍为纳米晶组织,但纳米晶尺寸更加均匀、细小 (为5-15 nm),表面粗糙度显著下降;纳米表层硬度略有提高,但基体硬度显著提高;在0.05 mol／L H2SO4+0.25 mol／L Na2SO4腐蚀介质中的耐腐蚀性能比SMAT后的样品有明显改善,但均低于原基材.

异步轧制取向硅钢的织构形成与转变机理

采用异步轧制方式将０．７５ ｍ ｍ 厚的工业取向硅钢板材冷轧至０．３５ ｍ ｍ ，然后用工业退火工艺对板材进行热处理，研究了剪切变形条件下的织构形成与转变机理。结果表明：双向轧制能有效地消除剪切应力导致织构组分偏离的影响，并获得比常规轧制板材更为理想的冷轧织构组态；亚表层上形成较强的｛１１１｝＜ １１２＞ 织构可能是源于不同于其它层的特殊形变方式；脱碳退火后板材亚表层上的Ｇｏｓｓ晶粒与绝大多数晶粒都有单轴重合的取向关系，这种特殊性可能是Ｇｏｓｓ晶粒在二次再结晶退火中能够异常长大的一种机制。

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°.

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加冷轧织构主要为: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.

取向硅钢生产工艺研究进展

结合取向硅钢的传统生产工艺,介绍其生产工艺研究的最新进展,重点介绍了薄板坯连铸连轧生产取向硅钢、异步轧制生产取向硅钢、双取向硅钢生产工艺、磁场退火生产取向硅钢和无抑制剂生产取向硅钢5种取向硅钢生产新工艺。这些新工艺均可在一定程度上提高取向硅钢的性能,有的已进入工业化实践阶段,有的已在实验室取得长足进步。

工业纯铜的异步冷轧及再结晶织构研究

本文采用不完整极图二步法测算ODF与计算机模拟相配合,研究了工业纯铜的异步冷轧织构沿轧板厚度方向的变化规律,同时也对冷轧试样的再结晶织构沿该方向的变化进行了探讨。结果表明,Cu的异步冷轧织构与普通冷轧织构在主要织构组份上大体相同,但在轧板厚度方向不同位置处,因残余切应变不同而导致织构的漫散程度和方向有所差异。异步轧制过程中的切应变对再结晶织构形态没有影响。

异步轧制高纯铝箔冷轧织构沿板厚的分布规律

通过异步轧制 ,研究了高纯铝箔冷轧织构沿板厚的分布规律。在异步轧制下 ,快、慢速辊侧之间的各中间层的织构类型不同。速比为 1.2 8,形变量为 99.2 %时 ,随厚度的增加 ,呈现出极有规律的变化 :{ 10 0 }丝织构含量近线性减少 ,而 { 112 } ,{ 10 2 } ,{ 12 3}丝织构含量近线性增加。当形变量为 99.2 %时 ,在不同速比下 { 0 0 1}丝织构含量沿厚度变化趋势不同 :速比 1.2 8时 ,呈现出近线性递减 ;速比 1.17和 1.0 6时 ,总的趋势也是递减 ,且在厚度d =0 .0