冷轧压下率对无抑制剂取向硅钢初次再结晶退火的影响

对无抑制剂取向硅钢不同压下率下初次再结晶退火后的显微组织、宏观织构和微观织构进行了研究.结果表明,冷轧板织构主要为α取向线{001}＜110＞、{112}＜110＞和{111}＜110＞织构以及γ取向线{111}＜110＞织构.初次再结晶退火后,α取向线织构减弱,织构主要为γ取向线{111}＜112＞织构.随冷轧压下率的增加,冷轧和初次再结晶织构强度增加.当压下率为88％时,初次再结晶退火后 Goss 织构和{111}＜112＞织构强度最高,最有利于发生二次再结晶.EBSD 分析显示,Goss 取向晶粒大多与{111}＜112＞取向晶粒相邻.提高冷轧压下率,Goss取向晶粒和{111}＜112＞取向晶粒都增加,Goss 取向晶粒偏离理想取向角度减少.     

普通取向硅钢轧制过程中组织和织构的演变

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。     

不同厚度低温渗氮型取向硅钢初次再结晶组织、织构差异分析

以0.27 mm、0.23 mm和0.20 mm三种厚度且磁性能都较好的取向硅钢样品为研究对象,通过EBSD技术对其对应的初次再结晶晶粒尺寸及织构进行研究,从而探索不同板厚度对应的最佳初次再结晶组织和织构是否存在异同。结果表明：三种厚度对应的最佳一次再结晶晶粒平均尺寸均在20～22μm范围内,沿板厚侧面的平均晶粒尺寸基本接近,约为21.4μm; 0.27 mm的中心层区域的平均晶粒尺寸比表层更大,而随厚度继续减小,表层和中心层平均晶粒尺寸逐渐接近。随板厚度的减小,初次再结晶织构增强,主要织构{114}〈481〉、{111}〈112〉以及{100}〈021〉织构均在一定程度上增强,其中{114}〈481〉织构的强度又显著高于其他织构;{114}〈481〉组分面积百分比增加,Goss以及{210}〈001〉组分减少。在这三种厚度样品中,表层区域的Goss、{210}〈001〉和{114}〈481〉组分比例都高于中心层,{100}〈021〉以及黄铜组分比例都低于中心层。随着厚度的减薄,表层和中心层区域的{114}〈481〉、{111}〈112〉织构以及中心层区域的{100}〈021〉织构都明...     

低温板坯加热晶粒取向3.0%Si钢高温退火中的组织演化

采用取向分布函数及金相分析方法研究了以Cu₂S为主要抑制剂的低温板坯加热晶粒取向硅钢(%:0.04C、3.16Si、0.50Cu)在650～1 050℃高温退火中组织的演化过程。结果表明,该取向硅钢的初次再结晶温度为650～700℃,二次再结晶温度为1 000～1 050℃。初次再结晶后的主要织构强度以{111}〈110〉、 {112}〈110〉、 {111}〈112〉顺序减弱。初次再结晶组织的晶粒尺寸和织构强度在700～900℃变化很小,在900～1 000℃晶粒长大速度加快,{111}〈110〉、{112}〈110〉组分增强,而{111}〈112〉组分的强度基本保持不变。     

取向硅钢微观组织和织构演化规律研究

结合鞍钢开发的厚度0.27 mm HiB取向硅钢的经验,研究了热轧、常化、冷轧、脱碳退火、高温退火等工序微观组织、织构的变化和演变规律。结果表明：热轧浅表层的组织为再结晶组织,中心层为未完全再结晶的带状组织,常化后均发生再结晶和再结晶组织的长大,取向硅钢的组织在冷轧和脱碳退火后转变为铁素体的等轴晶粒,经过二次再结晶后,Goss织构晶粒成长为毫米级的大晶粒。热轧浅表层是Goss{110}〈001〉织构的发源地,经过常化后Goss织构原位加强,冷轧后Goss织构转变为{111}〈112〉且部分残留在变形剪切带处,从而在二次再结晶时,形成了以Goss织构为主要织构组分的HiB取向硅钢。     

冷轧Ti-IF超深冲钢罩式退火机理及织构变化规律的研究

在480~750℃条件下,模拟罩式退火,利用光学显微镜、X射线衍射和金相显微硬度计研究了冷轧Ti-IF超深冲钢晶粒结构的变化,通过取向密度函数分析了再结晶过程织构演变规律。研究表明:冷轧Ti-IF超深冲钢的再结晶温度约为630℃,再结晶过程能够在660℃条件下2 h之内完成;冷轧后该钢主要有4种织构,分别是{001}〈110〉、{111}〈110〉、{111}〈112〉和{112}〈110〉;在退火再结晶过程中,{111}逐渐转变为γ-{111},当退火温度升至720℃时,{001}〈110〉和{112}〈110〉转变为纤维织构γ-{111},最终{111}〈110〉和{111}〈112〉成为主要织构类型。     

压延率对高磁导率硅钢初次再结晶织构的影响

用x-射线求织构系数方法研究了含MnS+AIN的3%si-Fe合金的初次再结晶织构中各晶面的织构系数N_(hkl).冷轧压延率通过改变初次再结晶织构组分的数量对二次再结晶行为影响很大,所得结果能很好地说明高温退火后的磁性变化规律.认为初次再结晶基体中很强的 {111}<112>和位向准确的{110}<001>的弱组分是获得完善的戈斯(Goss) 织构的重要条件.实验结果还指出,同最佳磁性相对应的压延率范围为82～87%,压延率低于82%时,初次再结晶织构中不仅{111}<112>组分很弱,而且偏离易磁化方向的二次再结晶核心数量成倍增加,其结果高温退火时这些核心彼此争长导致戈斯织构取向度下降.冷轧压延率太大 (88%以上){100}<011>位向变成冷轧织构中最强成份同样损害二次再结晶和磁性.     

冷轧压下率对薄规格取向硅钢冷轧和退火织构的影响

实验采用不同厚度的低温取向硅钢热轧板冷轧至0.18 mm。通过XRD分析冷轧板表面和中心层的织构,通过EBSD分析了脱碳板截面的织构。结果表明,冷轧样品表层和中心层,随着压下率增大,{111}面织构总含量有所减少,{100}面织构总含量有所增多;脱碳样品中{111}面织构明显增多,尤其是{111}〈112〉织构组分,{100}面织构明显减少,尤其是{100}〈011〉织构组分,{411}〈148〉织构组分也明显增多;脱碳样品中,随着压下率增大,晶粒尺寸逐渐减小。不利于二次再结晶发展的织构随着压下率的增大明显增加,同时有利的CSL晶界随着压下率的增加会稍有减少。     

无取向电工钢冷轧及退火织构的演变

运用不同冷轧、退火工艺的实验及ODF分析方法,分析了电工钢50W600的热轧织构、冷轧织构及再结晶织构的演变.研究表明:热轧带几乎是随机织构,α线非常弱;随着冷轧变形量的提高,晶粒在α线取向附近聚集程度不断提高,变形81%时,{001}《110》和{112}《110》取向密度分别为12和14.随退火温度升高和保温时间延长,α线的取向密度下降,{001}《110》和{112}《110》取向密度急剧降低,γ线{111}《112》密度显著增加,晶粒取向绝大多数聚集在γ线{111}《112》取向附近.通过控制冷轧及退火工艺,可有利于发展高{100}织构组分的冷轧无取向电工钢.     

一次再结晶法取向硅钢超薄带的冷轧塑性变形行为北大核心CSCD

以市场上购买的取向硅钢成品板为原料,经不同压下率冷轧至0.23~0.08 mm不等。借助X射线衍射仪(XRD)检测了冷轧后样品中的织构组分及其含量,利用电子背散射技术(EBSD)测量了试样的取向因子分布情况。观察了孪晶的形貌与晶体学特征,分析了硅钢超薄带的塑性变形行为。结果发现,在平面压缩应力下,{112}<111>滑移系的取向因子较大。随冷轧压下率的增加,Goss织构的含量逐渐减少,{212}<141>织构组分的含量先增加后减少,{111}<112>织构组分的含量逐渐增加,织构组分以{110}<001>→{212}<141>→{111}<112>顺序演变。冷轧后样品中出现了孪晶,其晶体取向为{001}<110>,冷轧过程中孪晶取向没有发生变化。     

Textures and Properties of Hot Rolled High Strength Ti-IF Steels

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.     

Texture of Hot Rolled Strip for Fe-3Si Steel Produced by Thin Slab Casting and Rolling

 Fe-3%Si steel strip was experimental produced by thin slab casting and rolling (TSCR) process in the laboratory. The microstructure and texture of hot rolled strip by different total reduction and rolling schedule was observed through EBSD technique and X-ray diffraction method. The changeable rule of texture density on the α、ε and γ, and fibers was analyzed. When the total reduction was increased from 82.9% to 97.1%,the gradient of microstructure and texture for A steel surface layer and center layer was found, {001}&;#8249;110&;#8250; texture had higher intensity, and {001}&;#8249;110&;#8250; texture was changed to     

Ti-26Nb-4Zr合金冷轧板材的织构和力学性能

采用X射线衍射和室温拉伸方法研究了冷轧变形和固溶处理对Ti-26Nb-4Zr合金板材的织构和力学性能的影响.研究发现,50%冷轧时形成了{001}〈uvw〉织构,随着冷变形量的增加,逐渐形成了{121}〈111〉和{001}〈110〉混合织构,〈110〉方向由与轧制方向垂直转到与轧制方向平行.800℃固溶处理后,随着变形量的增加,{111}〈110〉再结晶织构形成并逐渐增强,但〈110〉方向始终保持与轧制方向平行.由于加工硬化及晶粒细化的作用,导致随着变形量增加,冷轧板材的强度逐渐提高,塑性降低.固溶处理后,由于发生再结晶,使得板材的塑性相比冷轧态明显提高.      

Texture of Cold Rolled Strip of Fe-3Si Steel Produced by Thin Slab Casting and Rolling

 The hot rolled strip of Fe-3Si steel was experimentally produced by thin slab casting and rolling (TSCR) process in the laboratory. The texture evolution rule was investigated during hot rolling and cold rolling. The texture distribution of cold rolled strips with four kinds of cold rolling reduction schedules was observed through X-ray diffraction method, and the orientation density variation of 1/16 layer, 1/8 layer, 1/4 layer, and 1/2 layer in thickness was analyzed. The cold rolled texture of steel A with four kinds of cold rolling reduction schedules was mainly composed of α and γ fibers. Cold rolling reduction ratio of 70% was more beneficial for obtaining more γ fibers. The γ fiber texture orientation density of {111}<011> and {111}<1 12> was the largest on the 1/8 layer and 1/4 layer and the least on the 1/16 layer and 1/2 layer for steel B. The texture orientation density of {001}-{223}<110> in the α fibers for steel C was increased, but the texture orientation density of {332}-{110}<110> was low.     

Effects of Rolling Parameters on Texture and Formability of High Strength Ultra-Low Carbon BH Steel

 The effects of hot rolling and cold rolling parameters on texture and r (plastic strain ratio) value of high strength ultra low carbon bake hardening (ULC-BH) steels are studied with orientation distribution function (ODF) structural analysis method. After hot rolling, the high strength ULC-BH steel sheet has weak γ-fiber with uniform orientation distributions, and weak α-fiber, of which {445}<110> component forms a high intensity peak at coiling temperature of 750 ℃. After cold rolling, both {111}<110>-{111}<112> intensity on the γ-fiber and {111}-{112}<110> intensity on the α-fiber enhanced. As a result of substitutional solute elements Mn and P being added to the steel, strong {112}<110> deformation texture component is observed on α-fiber, especially at 80% cold rolling reduction, and this leads to the strong {111}<112> recrystallization texture after annealing. The increase of cold rolling reduction shifts the maximum intensity on the γ-fiber from {111}<112> to {111}<113>. After annealing, a very strong γ-fiber is obtained, with intensity peak at {111}<112> component when cold rolling reduction reaches 80%. Increasing coiling temperature and cold rolling reduction improve γ-fiber intensity and r value, resulting in good deep drawability.     

轧制-退火工艺制备超细晶D6 A钢的微观组织与织构

对D6 A钢热轧板进行了两相区轧制及退火处理,获得超细晶 D6 A 合金钢样品,微观结构特征为纳米尺寸的球粒状渗碳体弥散分布于亚微米尺寸的铁素体组织中.实验结果表明：随着退火温度由550℃升高至650℃,铁素体晶粒被拉长现象逐渐减弱直至消失,晶粒尺寸呈现先减小后增大的趋势,在550℃时达到最小尺寸400 nm;同时渗碳体尺寸逐渐由70增加至140 nm,其质量分数分数由9.6％降低至3.6％;随着退火温度升高,实验钢沿α和γ取向线分布的{112}＜110＞、{111}＜112＞和{001}＜110＞织构强度逐渐减弱,600℃退火后消失,{110}＜001＞与{112}＜111＞织构逐渐增强,硬度随退火温度升高由472 HV逐渐减小至423 HV.细晶强化、纳米尺寸渗碳体的析出强化,以及织构强化的共同作用是超细晶D6 A钢的主要强化机制.     

取向硅钢板坯加热温度对热轧及冷轧板织构的影响

 采用取向分布函数及取向线分析方法对取向硅钢高温和低温板坯加热工艺的热轧及冷轧钢板织构进行了研究。结果表明：低温与高温板坯加热工艺的热轧板及冷轧板织构组分有明显不同。低温板坯加热热轧板中{100}<001>及{110}<110>织构较强,但经冷轧后{001}<110>织构最强。