CSP薄板冷轧退火组织和织构的研究

采用EBSD分析方法,对CSP试验钢冷轧板退火过程中组织转变和再结晶织构的演变进行分析,结果表明,在退火过程中,α取向线上的{112}<110>和{110}<110>织构的取向密度基本上没有变化,{100}<110>织构的取向密度是逐渐降低的,而{111}<110>织构有所增强,γ取向线上{111}<011>和{111}<112>织构都是呈先降低后升高的趋势,而且最终{111}<011>和{111}<112>两种织构的取向密度趋于相等,分别为5.28和5.24.     

再结晶退火温度对无取向硅钢织构和磁性能的影响

对冷轧及退火后无取向硅钢织构及磁性能的变化进行研究。借助电子背散射衍射（EBSD）技术测量退火试样的极图,计算取向分布函数（ODF）和织构组分的体积分数,并利用TYU-2000M磁性能测量仪测量试样的磁性能。结果表明,810、840、880℃下退火3min后,试样的再结晶均充分完成,且晶粒随着退火温度的升高而长大;退火后,试样中首先显现{111}〈112）织构组分,且随退火温度的升高呈增强趋势;退火温度继续升高时,{111}〈110〉织构组分增强,一次再结晶后材料中出现{111}面织构,导致试样的磁感应强度B50降低,同时由于晶粒的长大使得试样的铁损P15减小。     

高能晶面TiO_2的可控合成及其光催化性能

利用水热法合成了形貌规则并具有高表面能{101}和{001}晶面的锐钛矿TiO_2单晶,通过X射线衍射和扫描电镜等对样品的形貌和结构进行了表征,系统考察了氢氟酸浓度对所得样品中{001}晶面比例的影响以及后处理对样品性能的影响。光催化降解罗丹明B反应表明,当氢氟酸为58mmol/L、合成晶体{001}晶面比例为48%时光催化效果最强。{001}晶面不是唯一影响光催化效率的因素,{001}晶面与{101}晶面的协同作用也同样重要。     

CSP冷轧薄板退火工艺的研究

采用EBSD分析方法,对CSP试验钢冷轧板退火过程中组织转变和再结晶织构的演变进行分析,结果表明,试验用钢的再结晶过程属于定向形核理论,试验钢的再结晶形核阶段在{111}112冷轧基体上形成了{111}110和{110}100再结晶形核,在{111}110变形晶粒晶界形成{111}112新晶粒核心,{111}112和{111}110织构相互生成.在晶粒长大阶段消耗的大量的{100}110织构,且生成了{112}110织构.     

基于元胞自动机方法的CSP流程冷轧低碳钢再结晶过程的模拟研究

采用元胞自动机方法对CSP流程冷轧低碳钢再结晶过程进行模拟研究。结果表明,冷轧变形量为71.4%的CSP流程冷轧低碳钢的再结晶开始温度为540℃左右,再结晶结束温度为600-620℃;计算机模拟得到再结晶完成温度为604℃,再结晶完成时间为96 min;再结晶完成时,其晶粒平均直径为7.0μm,而晶粒尺寸分布主要集中在2-14μm,此类尺寸晶粒约占晶粒总数的90%,且具备了Weibull分布函数的特征。同时冷轧低碳钢再结晶完成时,{111}〈110〉和{111}〈112〉织构组分的含量最高,总计为63.12%,{110}〈110〉和{112}〈110〉织构组分的含量则分别为9.67%和7.6%,而{001}〈110〉织构组分的含量最低。     

IF钢生产过程中的织构演变

对IF钢生产过程中热轧、冷轧及退火试样的织构演变进行研究。分别借助EBSD和XRD测定和计算了热轧、退火及冷轧试样的取向分布函数及相关织构组分的体积分数。结果发现,热轧板在变形过程中发生了动态再结晶,晶粒为细小的等轴晶,为后续组织发展提供了基础;热轧后试样中的织构很弱,不会影响冷轧织构组分及含量。冷轧过程是织构形成的主要过程,试样中含有4种主要的织构组分：{001}〈110〉、{111}〈110〉、{111}〈112〉和{112}〈110〉。退火过程中发生再结晶,4种冷轧织构组分在退火过程中均分别转变为{111}面织构。     

低温制备高比例{001}晶面择优的锐钛矿薄膜

通过低温水热法,在经退火处理的钛片上制备高比例{001}晶面择优的锐钛矿型TiO2薄膜。采用扫描电镜（SEM）和X射线衍射仪（XRD）,研究分析不同水热条件对二氧化钛薄膜生长的影响。结果表明:在40～80℃升高反应温度,能促进晶体取向附着,有利于纳米晶在[001]方向上择优生长;适当延长反应时间,能有效促进纳米二氧化钛薄膜的结晶度和（001）晶面的择优。在钛基底上原位生长具有高比例（001）晶面择优的锐钛矿型二氧化钛薄膜具有两种不同的生长机制,[001]晶向的择优生长及（001）晶面的择优曝露,可以通过控制反应温度和反应时间等实验参数实现对二氧化钛纳米薄膜的控制。     

单晶硅表层机械力学特性的各向异性分析

为探究挠性筋结构单晶硅材料的各向异性特性以及KOH腐蚀工艺对其力学性能的影响规律,进行纳米压痕实验,并结合原子力显微镜观察单晶硅表层3个主晶面上压痕裂纹形貌随晶向的变化规律,分析单晶硅材料表层弹性模量、硬度、断裂韧性等机械力学特性参数在(001)、(110)及(111)3个主要晶面上沿各个晶向的变化规律;分析挠性筋结构单晶硅材料(001)晶面的KOH腐蚀工艺对其材料表面机械特性的影响规律.结果表明:挠性筋单晶硅在(001)晶面上弹性模量的各向异性变化幅度明显,硬度及断裂韧性各向异性的变化幅度不大;挠性筋单晶硅在(110)晶面弹性模量和断裂韧性的各向异性变化幅度明显,硬度各向异性变化幅度不大;挠性筋单晶硅在(111)晶面硬度值、弹性模量及断裂韧性参数的变化幅度幅值均较小;确定了单晶硅表层3个晶面裂纹最易扩展的晶向方向,KOH腐蚀工艺使得单晶硅表面质量降低,腐蚀后暴露的表面微裂纹、缺陷等会使得单晶硅(001)晶面表层硬度、断裂韧性降低,从而降低了挠性筋结构的实际断裂强度.     

体心立方晶体{100}—{110}—{112}晶面上全位错反应系统

本文建立了一种晶面—晶向投影图,以揭示体心立方晶体{100)、{110)和{112)晶面簇中诸晶面以及在这些晶面上各重要晶向。根据该投影图,可以方便地获得这些晶面和晶向的位向关系,并全面确定在这些晶面上可能出现的全位错的反应类型及其具体组合方式。     

晶向和晶面的双重极图的绘制和应用

本文论述了计算机绘制晶向、晶面双重极图的基本原理及特点,并给出了应用实例。由于双重极图能作同步旋转,任何取向的双重极图皆可绘制。任何高指数的晶向极点或者晶面极点皆可输出。     

Texture of deformed Cu-Cr-Zr alloys

The influences of plastic deformation, aging treatment, and alloying elements on the texture of Cu-Cr-Zr alloys were explored. The texture component and intensity of Cu-Cr-Zr alloys under various working conditions after aging treatment were characterized using the orientation distributing function (ODF). The influence of Zr content on the texture of Cu-Cr-Zr alloys was also analyzed. The reduction pass and deformation level were primary factors influencing the texture. Rolling texture appeared in a rolled plate and the fibrous textures of {111} and {001} were detected after 80% deformation. Fibrous texture with a main constituent of {111} improved the tensile strength of the alloy wire. The texture contents of {110}<331> and {110}<112> were predominated, whereas, those of {113}<332> and {112}<111> were in the minority in the Cu-Cr-Zr alloy with a higher Zr content (>0.5wt%). However, in the samples with a lower Zr content (<0.1wt%), the texture contents of {113}<332>, {112}<111>, and {111}<110> were in the majority.     

Evolution of Grain Structure and Texture for 6082-T6 Aluminum Alloy during Friction Stir Welding

Stop-action technique was employed in order to study grain structure and texture evolution of thin 6082-T6 aluminum alloy sheets during friction stir welding(FSW). The evolutions of microstructure and texture were studied in different regions(ahead, behind, far behind the tool and base material as well) of the deformed samples. Materials ahead the tool experienced shear deformation were induced by rotation of the tool as well as the shoulder, which can pronounce copper and Goss texture. Grains behind the tool experienced dynamic recovery and recrystallization, exhibiting a characteristic of {110}001 recrystallization Goss texture. Materials far behind the tool probably experienced more thermal cycling. Recrystallization grains will grow and present {100}012 texture. In addition, the shoulder gave rise to a large shear stress that led to {111}110 shear texture.     

Mechanical performance and texture characteristic of an IF steel containing Nb and Ti by double cold rolling

Single cold rolling and double cold rolling were applied to hot rolled strips with different reduction ratios. The evolutions of {100},{111} and Goss face texture during double rolling were investigated by comparing the orientation distribution function(ODF) of the double rolled sample with that of the single rolled one. The double cold rolling texture is characterized by a higher γ-texture and a lower α-texture,and the {111}<112> component is improved remarkably. Based on the TEM observation and mechanical...     

Effects and mechanism of titanium modification on structures of cast steel ZG270-500

The influences of titanium modification on the solidification behavior, shrinkage characteristic and primary austenite refinement of cast steel ZG270-500 smelted in intermediate frequency induction furnace were studied. 0.15wt% titanium modification increased the fluidity of the steel liquid, enhanced the feeding capacity of cast steel, changed the dispersed shrinkage porosity to concentrated shrinkage cavity, turned the coarse dendrites into fine equiaxed grain structures and greatly reduced the primary austenite grain size. By scanning electron microscope (SEM) and energy disperse spectroscope (EDS) analysis, it was found that titanium combined with carbon to be solid phase particles TiC, with high melting point, to promote the primary austenite nucleation authentically by non-spontaneous nucleating. The crystal lattice match growing model between γ-Fe and TiC was established. The mechanism of TiC heterogeneous nucleating existed in that the primary austenite grew up by {111}γ-Fe parallel to the closest packed plane {111}TiC in the crystal orientation <110>γ-Fe//<211>TiC. The crystal planes mismatch and the lowest orientation mismatch δ<110>γ-Fe <110>TiC were 8.18%. and 2.25% respectively, almost achieving complete coherent lattice match growing of austenite on TiC.     

Analysis for twinning and slip in face-centered cubic crystals under axisymmetric co-deformation

The maximum work principle of Bishop-Hill was developed to analyze the axisymmetric co-deformation in face-centered cubic crystals (f.c.c.) for twinning on {111} 112 and slip on {111} 110 systems. The influence of ξ , the ratio of critical re- solved shear stress for twinning to slip, on the yield stress states and corresponding active slip or/and twinning systems for orientations in the standard stereographic triangle of cubic crystal was investigated systematically. The Taylor factors and the anisotropy of yield strength for three important orientations [100], [110] and [111] in orientation space were analyzed. It is found that the yield strength asymmetry for the case of axisymmetric de- formation of tension and compression can be explained based on the microscopic theory of crystal plasticity. The concept of orientation factor for twinning ability was proposed and the deformation mechanism map in the orientation space was established for the case of axisymmetric deformation. The deformation texture formation and development of f.c.c. crystals with low stacking fault energy for axisymmetric tension can be explained qualita- tively on the basis of analyzed results.     

亚铁阳极电解还原处理含铬废水

为了电解还原处理含铬废水,以聚丙烯腈碳毡作电极,石墨板作双极板,以阳离子交换膜为隔膜,组装出氧化还原电池系统.此系统阴极电解还原处理含铬废水,同时阳极氧化Fe2 为Fe3 .电池系统的平均电流效率达92.29%,处理后废水中铬含量小于10-5mol/L,达到国家排放标准.