欢迎登录材料期刊网

材料期刊网

高级检索

  • 论文(9)
  • 图书()
  • 专利()
  • 新闻()

Effect of Thermomechanical Treatment Temperature on Structure and Properties of CFB/M Ultra-High Strength Steel

XU Xue-xia , BAI Bing-zhe

钢铁研究学报(英文版)

Modified CCT diagram of carbide free bainite-martensite(CFB/M)high strength steel was established applying small sample control cooling. In addition, the influence of thermomechanical treatment temperature on its structure and properties was discussed. The experimental results show that when deformed at 860oC and below, ferrite transformation occurred due to strain, and with the decrease of ausforming temperature, the quantity of ferrite increased and strength and toughness deteriorate. Therefore, certain information were provided for drawing technical parameter of ausforming process; firstly, the thermomechanical treatment temperature shouldn’t be above 860oC to avoid ferrite formation induced by deformation; secondly, cooling rate shouldn’t be too slow to avoid ferrite precipitating during cooling process after ausforming process.

关键词: thermomechanical treatment;carbide free bainite/martensite(CFB/M);high strength steel

A Mn-Series of Oil Quenched Super-Strength Bainitic Steel With High Hardenability

ZHANG Han , BAI Bing-zhe , et al

钢铁研究学报(英文版)

A new Mn series oil quenching super strong bainitic steel was developed on the basis of the alloy system of the original Mn series air cooling bainitic steel. The mechanical properties of the new steel are well combined while precious alloy elements and complicated technologies are not needed for its production. Experimental results show that: bainite/martensite(B/M) dual phase microstructure can be obtained within a very wide cooling rate range and bainite microstructure exists even when the cooling rate reaches as fast as 60oC/s; the hardenability of the steel is better than that of 40CrNiMo and 42CrMo; the round bar made of the steel with the diameter of 250mm, which goes through tempering at 350oC after oil quenching, exhibits its central mechanical properties as follows: σb=1550MPa, σ0.2=1270MPa, δ5=15%, aku=95J/cm2 (at room temperature).

关键词: bainite;oil quenching;hardenability;mechanical property;martensite

光谱和电化学方法研究黄芩素与核酸相互作用的机理

郭蒙 , 王淑敏 , 王佳丽 , 李丹 , 高庆宇 , 李丽敏

应用化学 doi:10.3724/SP.J.1095.2014.30232

在pH=3.22的NaAc-HAc溶液中,应用循环伏安法、方波伏安法、荧光光谱法、紫外可见光谱法和黏度法研究了黄芩素(BAI)与鲱鱼精子DNA(fsDNA)之间的相互作用,发现二者通过沟槽作用形成一电活性较高的复合物,fsDNA为BAI提供了一个低极性的疏水环境导致BAI的峰电流显著增强,增强的峰电流与fsDNA在7.0×10-8 ~7.0×10-6 g/mL浓度范围内呈正比,由此建立了一种测定核酸的新方法,检测限达到4.1×10-8 g/mL.

关键词: 黄芩素 , 核酸 , 电化学 , 沟槽作用

Improved Nonlinear Equation Method for Numerical Prediction of Jominy EndQuench Curves

SONG Yuepeng , LIU Guoquan , LIU Shengxin , LIU Jiantao , FENG Chengming

钢铁研究学报(英文版)

Without considering the effects of alloying interaction on the Jominy endquench curves, the prediction results obtained by YU Baihai′s nonlinear equation method for multialloying steels were different from those experimental ones reported in literature. Some alloying elements have marked influence on Jominy endquench curves of steels. An improved mathematical model for simulating the Jominy endquench curves is proposed by introducing a parameter named alloying interactions equivalent (Le). With the improved model, the Jominy endquench curves of steels so obtained agree very well with the experimental ones.

关键词: Jominy endquench curve;nonlinear equation method;alloying interaction parameter;computer simulation

MgO掺杂对BaSrTiO3介质陶瓷性能的影响

曲远方 , 张连松 , 李远亮

稀有金属材料与工程

通过实验,研究了MgO掺杂对BaSrTiO3陶瓷介电性能的影响和机理.观察了样品的微观形貌,讨论了氧化镁在调整Ba1-xSrxTiO3铁电陶瓷的介电-温度特性的作用.结果表明,氧化镁掺杂对Ba1-xSrxTiO3系介质陶瓷产生了压峰和移峰作用.借助扫描电镜对所制得的样品进行了分析,氧化镁掺杂使Bai.SrxTiO3系介质陶瓷的结构细晶化.以实验结果和微观结构分析为依据探讨了氧化镁掺杂改性作用的机理.

关键词: Ba1-xSrTiO3 , 介电特性 , MgO , 掺杂

高PPI ADS产品白Mura不良产生原理及改善研究

桑胜光 , 车晓盼 , 王嘉黎 , 郭红光 , 井杨坤 , 李泽 , 游伟

液晶与显示 doi:10.3788/YJYXS20163105.0435

现有传统TFT-LCD生产工艺中,Rubbing工艺在生产高PPI ADS产品的过程中,在改善Rubbing Mura不良时会使用H Cloth,但使用H Cloth Glass在经过Rubbing后ODF Rubbing Cleaner清洗时会出现白Mura不良.经过对白Mura不良Panel的微观解析,并结合H Cloth性质分析出白Mura不良是由于H Cloth自身的聚醋酸脂颗粒经过Rub-bing Cleaner聚集造成的.从Rubbing Cleaner清洗时改变Glass表面性质(醇类可以有效改变界面性质)入手,通过使用IPA对Glass进行清洗以改变聚醋酸脂疏水性,使得聚醋酸脂颗粒更易被Rubbing Cleaner清洗掉来改善白Mura不良,并结合生产实际定期对IPA进行更换以保持IPA浓度处于一个稳定的区间,使得高PPI ADS产品白Mura不良发生率由改善前的3.42%降低至改善后的0.11%,白Mura不良得到非常有效的改善.

关键词: 高PPI , 白Mura不良 , 聚醋酸脂 , 疏水性

钛合金绝热剪切的敏感性分析及环境温度的影响

王学滨

稀有金属材料与工程

通过引入与Batra及Kim类似的观点,将绝热剪切带宽度定义为绝热剪切带的中心区域的宽度(W5%),在该区域上温度比其峰值小5%,利用Johnson-cook模型及梯度塑性理论分析Ti-6A1-4V绝热剪切带的厚度随环境温度的演变规律.计算表明,随着环境温度的升高,绝热剪切带宽度增加,这与许多实验观测结果一致.当绝热剪切带的总厚度在上限时,绝热剪切带宽度-环境温度曲线是稍微上凹的;但是,当绝热剪切带的总厚度在下限时,绝热剪切带宽度-环境温度曲线基本上是直线,著名的Dodd及Bai模型无法预测这些新现象.关于绝热剪切带宽度的计算结果非常接近于Liao及Duffy的实测结果.在忽略应变硬化的条件下,采用线性软化模型及梯度塑性理论推导w5%的简化解析式,发现环境温度、密度、热容、软化模量、剪切应力的增加使绝热剪切的敏感性降低,而功热转化因子及抗剪强度的降低使绝热剪切的敏感性降低.

关键词: Ti-6Al-4V , 绝热剪切带 , 宽度 , 环境温度 , 梯度塑性理论 , Johnson-Cook模型 , 绝热剪切敏感性

Ti-6Al-4V绝热剪切带的厚度及应变率效应研究

王学滨

稀有金属材料与工程

通过引入与Batra及Kim类似的论点,将绝热剪切带宽度定义为绝热剪切带的中心区域的宽度(w5%),在该区域上温度比其峰值小5%,利用Johnson-Cook模型及梯度塑性理论分析Ti-6Al-4V绝热剪切带的厚度及应变率的影响.计算表明,在名义应变率的下限(800s-1)及上限(1400s-1)之间,当绝热剪切带的总厚度选取为0.3235及0.0705 mm时,计算结果非常接近于绝热剪切带宽度的上限(55 um)及下限(12 um).当应变率较低时,绝热剪切带较宽.随着应变率的增加,绝热剪切带宽度快速降低.在高应变率时,绝热剪切带宽度基本保持恒定.该理论结果与Dodd及Bai的理论结果有类似之处,与Weerasooriya及Beaulieu针对钨合金的实验结果非常一致,与Klepaczko及Rczaig的数值结果的前半部分相似.

关键词: Ti-6Al-4V , 绝热剪切带 , 应变率 , 梯度塑性理论 , Johnson-Cook模型

沉淀法制备中药黄芩素分子印迹微球

王松 , 王兵 , 单娟娟

高分子材料科学与工程

以黄芩素(BAI)作为模板分子,α-甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,偶氮二异丁腈(AIBN)为引发剂,采用沉淀聚合法不同溶剂体积制备了系列分子印迹聚合物.紫外光谱研究了模板与功能单体相互作用情况,傅里叶变换红外光谱、场发射扫描电子显微镜对其结构进行了表征,并通过动力学吸附和选择性吸附实验对其吸附动力学和热力学以及特异性识别进行了研究.结果表明,模板分子和功能单体之间通过氢键自组装形成1:4配合物;不同溶剂体积对聚合物微球的结构影响显著:随着溶剂体积增加,印迹聚合物微球粒径增加,而吸附量减小;其动力学吸附符合准二级动力学模型,吸附热力学表明其吸附以物理吸附为主;聚合物微球对不同结构底物槲皮素(Qu)和氯霉素(CAP)的吸附表现出低的吸附量,分离因子分别为17.69和26.03.

关键词: 黄芩素 , 分子印迹 , 微球 , 沉淀聚合

出版年份

刊物分类

相关作者

相关热词