电场退火对08Al深冲钢板深冲性能的影响

利用X射线衍射技术(ODF分析)和拉伸实验研究了退火过程中电场对冷轧08Al钢板深冲性能的影响·结果表明:电场退火提高了08Al深冲钢板的塑性应变比(r值)和加工硬化系数(n值),同时降低了塑性应变比各向异性(Δr值),即提高了08Al钢板的深冲性能·其主要原因在于电场提高了08Al深冲钢板再结晶γ纤维织构的强度和降低了再结晶α纤维织构的强度     

CSP流程下退火加热制度对深冲板织构和性能的影响

以包钢CSP流程热轧板为基料的SPCD冷轧板为试验材料,采用单台阶和双台阶两种退火加热制度进行实验室试验,对比分析了不同规程下的再结晶织构、组织和性能特点.结果表明,双台阶退火工艺对应的γ织构、α织构上的{111}〈110〉成分均有所提高,但是双台阶工艺下的Δr值偏大.分析认为,双台阶和单台阶在回复阶段上有所不同,不利取向组分形核受到了抑制,最终导致有利织构含量上的差别.在双台阶工艺下,{110}〈110〉织构强度的提高导致Δr值偏大.     

影响冷轧DP590组织性能的连续退火工艺

为确定最优的退火工艺制度,对某钢厂冷轧DP590钢种连续退火工艺进行模拟试验,对该钢种在不同退火温度、快冷速度、过时效温度工艺条件下的组织和性能进行分析.结果表明:800℃退火时双相钢组织中马氏体比例为10％～15％,得到理想的双相钢的性能和组织;冷速提高可获得强化效果明显的板条马氏体,快冷段冷却速度在2(25℃/s时材料具有综合的性能指标;过高的过时效温度,发生贝氏体转变过时效温度为260～290℃可获得较为理想的组织和性能.     

连续退火工艺对低硅型冷轧低合金高强钢板 力学性能的影响

利用多功能连续退火模拟器Multipas对屈服强度为380MPa的低硅型冷轧低合金高强钢板连续退火生产工艺进行了模拟,研究了在820,800, 780℃三种不同退火温度和60, 120,160m·min-1三种不同退火速度下,连退工艺对冷轧低合金高强钢板组织、力学性能的影响.结果表明,在不同的退火温度、退火速度下钢板退火组织的晶粒度基本相同,采用较低的退火温度和较高的退火速度时,可获得较好的强化效果.同时指出,在较高的连续退火温度下,退火速度对力学性能的影响较为显著.     

罩式退火过程中钢卷的钢卷温度场计算技术研究

针对罩式退火过程的钢卷内部温度场的分布特点,提出了一套适合于罩式退火系统的钢卷温度场计算技术,并将其应用到某罩式退火生产线的生产实践,为机组罩式退火过程中退火工艺制度的制订奠定了坚实的理论基础.     

强磁场退火对冷轧IF钢板再结晶织构的影响

通过SEM-EBSD分析研究了在再结晶初期强磁场退火对冷轧IF钢板再结晶织构的影响.将样品加热到650℃分别保温0,10,30 min以获得部分再结晶的样品.磁场退火时磁场方向平行于样品的横轧向,所施加的磁场强度为12 T.结果表明,在再结晶初期,与其他{111}取向的再结晶晶粒相比,磁场退火有利于{111}〈112〉取向的再结晶晶粒首先形核和长大.     

磁场退火对无取向硅钢再结晶织构和组织的影响

为了研究磁场退火对金属材料的再结晶织构和晶粒尺寸的影响,对冷轧无取向硅钢薄板进行了普通退火以及0.1,6和12 T下的磁场退火,磁场沿轧向施加.研究表明,磁场退火显著影响再结晶织构的取向密度和晶粒尺寸,且与磁感应强度成非线性关系.磁场退火增强有利的η(〈001〉∥RD)和{100}织构,减弱不利的γ(〈111〉∥ND)织构,该效应在6 T磁场下较显著;再结晶晶粒尺寸在6 T磁场退火时较大,普通及12T磁场退火时居中,0.1 T磁场退火时较小.从磁场降低晶界可动性和提供与取向相关的附加晶界迁移驱动力的角度,分析了磁场作用机制.     

成品退火对高纯铝箔立方织构的影响

高纯铝箔主要用于制作高压电容器的阳极材料,电容器的比电容大小与阳极箔材中立方织构的含量密切相关立方织构含量越高,箔材腐蚀后有效表面积越大,其比电容也相应越大.作者采用晶体取向分布函数(ODF)研究和分析了成品退火工艺制度及冷却速度对不同铁含量高纯铝箔立方织构的影响.研究结果表明含Fe0.0011％的高纯铝箔在二级退火190℃/3h+520℃/2h条件下立方织构含量较高,R织构比例较小.由于铁的含量及存在状态严重影响了高纯铝箔的立方织构含量,当铁含量较高或过饱和固溶在基体中时,成品退火时主要出现原位再结晶,立方织构较弱,R织构较强.因此,含Fe0.0016％的高纯铝箔成品退火后虽在空冷时立方织构含量较高,但其立方织构含量均低于含Fe0.0011％的高纯铝箔中的立方织构含量.     

退火时间对IF深冲钢板再结晶织构的影响

借助于三维取向分布函数(ODF)分析,研究了IF深冲钢板在750℃和800℃退火时不同保温时间对其再结晶织构的影响.实验结果表明,750℃和800℃退火试样的再结晶γ纤维织构({111}〈uvw〉)的强度随退火时间的延长而逐渐增强,再结晶α纤维织构中从{001}〈110〉至{112}〈110〉的强度随着退火保温时间的延长而下降然后再回升.同时800℃退火试样的γ纤维织构的强度明显高于750℃退火试样的γ纤维织构的强度,与之对应800℃退火试样的α纤维织构的强度显著低于750℃退火试样的α纤维织构的强度.     

退火工艺对BST薄膜电学性能的影响

应用RF平面磁控溅射技术在Pt/SiO2/Si(100)衬底上沉积BST薄膜,研究了退火气氛与退火工艺对BST薄膜电学性能的影响。实验发现,退火有利于提高薄膜的结晶度,且薄膜的折射率、介电常数和漏电流特性等性能与薄膜的退火工艺密切相关,和N2气氛中退火的BST薄膜相比,O2气氛退火的BST薄膜具有较大的介电常数和较小的漏电流,可满足DRAMs器件应用的要求。     

退火工艺对AZ31B镁合金铸轧板组织和性能的影响

研究不同退火温度、时间对普通铸轧和复合能场(电磁场+超声波)铸轧AZ31B镁板组织及性能的影响。研究结果表明:铸轧镁板的再结晶温度在复合能场作用下降低了约50℃;250℃退火时,普通铸轧镁板无明显再结晶,复合能场铸轧镁板局部再结晶;在300℃,4 h时,铸轧镁板均充分再结晶,复合能场铸轧镁板晶粒细小,组织均匀,平均晶粒直径为8~13μm,而普通铸轧镁板晶粒平均晶粒直径为14~19μm;400℃退火时,晶粒开始粗大,1 h时复合能场铸轧镁板与普通铸轧镁板的平均晶粒直径分别为28~33μm和20~25μm。退火后,铸轧镁板内析出相数减少,复合能场铸轧镁板析出相弥散分布在晶界上,普通铸轧镁板析出相较多并富集在晶界和晶界附近。退火后铸轧镁板的塑性变形能力明显改善,在300℃,4 h时,复合能场铸轧镁板的硬度、抗拉强度、屈服强度、伸长率比普通铸轧镁板分别提高了4.7%,17.2%,34.1%和74.6%。     

Effect of electrolytes on electrochemical properties of graphene sheet covered with polypyrrole thin layer

Graphene sheet (GS) was successfully covered with a polyp yrrole (PPy) thin layer through in situ chemical oxidative polymerization of pyrrole monomers in aqueous solution by using GS as a support materi al and ferric trichloride as an oxidant. The resulting nanocomposite was studied by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR) and electrical measurements, including cyclic voltammetry (CV), galvanostatic charge/discharge experiment (GCD), and impedance spectroscopy (EIS). It has been found that the nanocomposite exhibited a typically curved and layer ?like structure, and conformational change of PPy chains occurred due to the π?π stacking interaction between the graphitic structures in GS and aromatic rings of the PPy chains. More attention was paid to the effect of electrolytes on electrochemical properties of the nanocomposites, as expected, electrochemical performance was dependent on the nature of the electrolyte, and the neutral electrolytes containing alkali metal ions were found to be very suitable for GS/PPy nanocomposite. Compared with the pure PPy, the nanocomposite possessed larger specific capaci tance and lower internal im pedance, indicating that the nanocomposite can be a promising candidate as electrod e material for supercapacitors.     

Effect of electrolytes on electrochemical properties of graphene sheet covered with polypyrrole thin layer

Graphene sheet (GS) was successfully covered with a polypyrrole (PPy) thin layer through in situ chemical oxidative polymerization of pyrrole monomers in aqueous solution by using GS as a support material and ferric trichloride as an oxidant. The resulting nanocomposite was studied by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR) and electrical measurements, including cyclic voltammetry (CV), galvanostatic charge/discharge experiment (GCD), and impedance spectroscopy (EIS). It has been found that the nanocomposite exhibited a typically curved and layer–like structure, and conformational change of PPy chains occurred due to the π–π stacking interaction between the graphitic structures in GS and aromatic rings of the PPy chains. More attention was paid to the effect of electrolytes on electrochemical properties of the nanocomposites, as expected, electrochemical performance was dependent on the nature of the electrolyte, and the neutral electrolytes containing alkali metal ions were found to be very suitable for GS/PPy nanocomposite. Compared with the pure PPy, the nanocomposite possessed larger specific capacitance and lower internal impedance, indicating that the nanocomposite can be a promising candidate as electrode material for supercapacitors.     

Simulation of annealing process effect on texture evolution of deep-drawing sheet Stl5

A two-dimensional cellular automaton method was used to simulate grain growth during the recrystallization annealing of deep-drawing sheet Stl5, taking the simulated result of recrystallization and the experimental result of the annealing texture of deepdrawing sheet St15 as the initial condition and reference. By means of computer simulation, the microstructures and textures of different periods of grain growth were predicted. It is achieved that the grain size, shape and texture become stable after the grain growth at a constant temperature of 700°C for 10 h, and the advantaged texture components {111 }<110> and {111 }<112> are dominant.     

轧制工艺对TA15钛合金板微观组织及拉伸力学性能的影响

对比研究了采用包套轧制工艺及普通冷轧工艺制备的TA15 钛合金薄板的纵、横向微观组织及室温和高温拉伸力学性能。研究表明：两种工艺获得的钛合金板纵、横向微观组织的物相、尺寸、体积占比相似,纵向维氏硬度较横向的高。热轧工艺与冷轧工艺制备的钛合金板相比,力学性能更加优异、力学性能纵横向差异小、综合性能更好、室温屈服强度更高,呈现出“横向大于纵向、热轧大于冷轧”的对比特征。热轧工艺可弱化织构的方向,使成品钛合金板呈现出“强度高、屈强比大、纵横差小”的拉伸力学性能特性。     

体系pH对MoO_3薄膜结构及光致变色性能的影响

采用溶胶-凝胶法制备了MoO3光致变色薄膜,主要探讨溶液pH值对薄膜结构及性能的影响,运用XRD、SEM、UV-Vis-DRS及全自动色差计对氧化钼薄膜的结构及性能进行了表征.实验表明:随溶液pH值的升高,MoO3薄膜光致变色性能先增强后减弱.pH=1.0时薄膜结晶度较好,颗粒粒径较小,分布较均匀,激发波长蓝移,薄膜的吸收光波区域变宽,色差值达到2.427,光致变色性能提高.     

溅射功率对氮化铜薄膜结构及其性能的影响

采用反应射频磁控溅射方法,在氮气和氧气混合气氛下并在玻璃基底上成功制备出了纳米氮化铜(Cu3N)薄膜,并研究了溅射功率对Cu3N薄膜的择优取向、平均品粒尺寸、电阻率、光学能隙的影响.XRD显示溅射功率对氮化铜薄膜的择优取向影响很大,在低功率时薄膜择优[111]方向,在较高功率时薄膜择优[100]方向.紫外可见光谱、四探针电阻仪等测试表明:当溅射功率从80 W逐渐增加到120 W时,薄膜的光学能隙从1.85 eV减小到1.41 eV,电阻率从1.45×102 Ωcm增加到2.99×103 Ωcm.     

预冷等温球化退火工艺对Cr12型模具钢组织性能的影响

通过对Cr12型模具钢常规球化退火工艺的改进,得到了预冷等温球化退火新工艺。并对不同球化温度、不同退火保温时间对钢组织性能的影响进行了探讨。结果表明:改进的预冷等温球化退火新工艺合理可行,可获得硬度低于200HB、碳化物颗粒均匀细小的球化效果。球化温度和退火保温时间对组织性能均有一定影响。Cr12型模具钢理想的球化退火工艺为:球化温度940℃,保温至透烧,出炉油冷到400℃,进行730℃等温退火处理,冷却速度为<30℃/h至200℃出炉。