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Thermodynamic Assessment of Reactions between Yttrium and Tramp Elements in Petroleum Pipe Steel

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International Journal of Minerals,Metallurgy and Materials 1998年第4期12卷 219-222页

作者： aixue sha Luren Dong shangyi Li( Metallurgy School, University of Science and Technology Beijing, Beijing 1 00083, China)(Science and Technology Department, Metallurgical Industry Bureau of China, Beijing 100711, China) Metallurgy School University of Science and Technology Beijing Beijing 100083 China Science and Technology Department Metallurgical Industry Bureau of China Beijing 100711 China

In the thermodynamic evaluation Y was selected as a typical heavy rare earth metal for reducing the detrmental effects of tramp elements in the petroleum pipe steel. The possibilities of reactions between Y and trampelements such as Sn, Sb, As, etc. after deoxidation and desulphurization were estimated by calculating the Gibbsfree energies of formation. The equilibrium content of Y for eliminating the detrimental effects of tramp elements inthe steel was recommended from the results of thermodynamic calculation.

关键词： rare earth metals tramp elements thermodynamic calculation

Relationship between Intragranular α Phase Width and Microhardness of TC18 Titanium Alloy

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Relationship between Intragranular α Phase Width and Microh...

Microstructure Evolution and Deformation Behavior of Metastable β-Titanium Alloy Ti55511 in Die Forging

中国材料大会2012

作者： Honghua Li Guoqing Wu Chenglong aixue sha School of Mat. Sci. & Eng. Beihang University Beijing Institute of Aeronautical Materials

Four typical microstructures of TC18 titanium alloy （Widmannstatten structure, Fine basketweave structure, Bi-model structure, Coarse basketweave structure） were investigated, including the changes of intragranular α phase width and the relationship between intragranular α phase width and microhardness. The results show that the intragranular α phase width of the four typical microstructures varies greatly in accordance with the order from smallest to largest: Widmannstatten structure ＜ Fine basketweave structure ＜ Bi-model structure ＜ Coarse basketweave structure. The microhardness of the TC18 titanium alloy reduces with the increase of intragranular α phase width.

关键词： Titanium alloy Microstructure Quantitative analysis Microhardness.

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稀有金属材料与工程 2024年第9期53卷 2420-2429页

作者： Gu Bin Xiong Zhihao Yang Ping Gu Xinfu Yan Mengqi sha aixue School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China AECC Beijing Institute of Aeronautical Materials Beijing 100095China

The effect of die forging on the microstructure evolution and deformation behavior of metastable β-titanium alloy Ti55511 was investigated by electron backscatter *** die forging,the alloy Ti55511 was subjected to multi-pass forging to optimize the microstructural heterogeneity(texture)which can cause mechanical behavior anisotropy of titanium *** show that after die forging,Ti55511 components exhibit different microstructures and textures in different local ***fiber texture is found in all areas with different degrees of *** recrystallization occurs in the area where large strain occurs during the early stage of die ***-weave microstructure forms in most local areas.

关键词： metastableβ-titanium alloy microstructure texture die forging EBSD

Analysis of Hot Deformation Dynamics of TC18 Titanium Alloy

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Analysis of Hot Deformation Dynamics of TC18 Titanium Alloy

Relationships between Spring-back and Microstructure of Ti-15V-3Cr-3Sn-3Al Titanium Alloy Sheet during Bending Process

中国材料大会2012

作者： Qingrui Wang aixue sha Xingwu Li Lijun Huang Beijing Institute of Aeronautical Materials

ISBN: (纸本)9783037856086;3037856084

The effect of strain rate and deformation temperature on flow stress of TC18 titanium alloy was studied through heat simulating tests in 76060℃ with temperature interval and the strain rate interval in 0.010s-1 . Relationship model of flow stress versus strain was established and hot deformation mechanics of TC18 titanium alloy was analyzed. The results show that the flow stress reduces obviously as the deformation temperature increases or the strain rate decreases. Dynamic recovery occurs at high strain rate above phase transformation point, while dynamic recrystallization occurs at low strain rate as well as at the temperature below phase transformation point.

关键词： TC18 titanium alloy Hot deformation Flow stress Strain Dynamics.

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Relationships between Spring-back and Microstructure of Ti-1...

锻态TC18钛合金棒材中b相组织和织构特征研究

中国材料大会2012

作者： Linlin Li Guoqing Wu Changxu Liu aixue sha School of Mat. Sci. & Eng. Beihang University Beijing institute of Aeronautical Materials

ISBN: (纸本)9783037856086;3037856084

Evolutions of microstructure, micro- hardness in the central deformation area and spring-back, were studied in different bending conditions of Ti-15V-3Cr-3Sn-3Al titanium alloy sheet. The results show that, with the increase of bending deformation, i.e. increase of bending angle or decrease of bending radius, the grain area, the grain feret diameter ratio and micro-hardness in the central deformation area all show nearly linear growth trends. The spring-back angle has no clearly correlation with the degree of bending deformation. While the spring-back rate correlates positively with the length of deformation-affected zone, which can reflect the characteristics of bending deformation more intuitively than that of spring-back angle.

关键词： Titanium alloy Microstructure Bending behavior spring-back Quantitative statistic analysis.

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金属学报 2014年第6期50卷 707-714页

作者：李凯杨平沙爱学颜孟奇北京科技大学材料科学与工程学院北京100083 中航工业北京航空材料研究院北京100095

针对a/b型TC18钛合金大型锻棒中心与边部的性能差异,利用EBSD技术研究了b相的组织差异、织构差异及形变程度差异,并考察了b相的这些差异对遵循Burgers关系的ap相取向及球化速率的影响.结果表明,锻态TC18钛合金中的b相处于不同程度的形... 详细信息

针对a/b型TC18钛合金大型锻棒中心与边部的性能差异,利用EBSD技术研究了b相的组织差异、织构差异及形变程度差异,并考察了b相的这些差异对遵循Burgers关系的ap相取向及球化速率的影响.结果表明,锻态TC18钛合金中的b相处于不同程度的形变状态,随位置不同而具有不同的织构,中心位置b相具有再结晶织构的特点,并且存在显著的晶粒尺寸不均匀性,这些因素对中心与边部的性能差异有主要贡献.ap相的球化过程主要在b相晶内亚晶界上完成,前期随形貌由片状向方块状的变化,取向关系变化很小;后期向球形过渡时,取向关系偏差较大.b相晶粒内的取向差是衡量加工硬化对强度贡献的有效参数,而a/b两相的取向关系与理想Burgers关系的偏差是揭示球化速度和形变b相晶粒回复程度的有效参数.

关键词：钛合金锻造织构相变

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BT16钛合金紧固件加工工艺分析

稀有金属材料与工程 2006年第3期35卷 455-458页

作者：沙爱学王庆如李兴无北京航空材料研究院北京100095

分析了不同规格俄制BT16钛合金自锁螺母显微组织、流线和显微硬度,并与俄制该合金φ8mm丝材进行对比。研究结果表明:BT16钛合金紧固件显微组织为单相区变形获得的超细片状组织;其组织形态与退火态丝材一致,表明紧固件是在退火状态下直... 详细信息

分析了不同规格俄制BT16钛合金自锁螺母显微组织、流线和显微硬度,并与俄制该合金φ8mm丝材进行对比。研究结果表明:BT16钛合金紧固件显微组织为单相区变形获得的超细片状组织;其组织形态与退火态丝材一致,表明紧固件是在退火状态下直接使用的,未经过固溶时效强化处理;BT16钛合金紧固件采用了冷变形制造工艺。

关键词： BT16钛合金紧固件显微组织

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TC27钛合金高温热压缩变形行为

稀有金属材料与工程 2016年第3期45卷 793-797页

作者：李雪飞黄旭黄利军沙爱学北京航空材料研究院北京100095

在Thermecmastor-Z试验机上进行热压缩实验,在应变速率0.01~10 s^(-1)、变形温度900~1150℃条件下对TC27钛合金的变形行为进行研究并建立其本构方程。结果表明,该材料为温度和应变速率敏感材料。在变形初始阶段,流变应力随真应变的增加... 详细信息

在Thermecmastor-Z试验机上进行热压缩实验,在应变速率0.01~10 s^(-1)、变形温度900~1150℃条件下对TC27钛合金的变形行为进行研究并建立其本构方程。结果表明,该材料为温度和应变速率敏感材料。在变形初始阶段,流变应力随真应变的增加迅速增大,达到应力峰值后随真应变的增加缓慢降低,最后趋于相对稳定的状态。流变应力随温度的升高而降低,随应变速率的增加而增加。热压缩实验过程流变应力随应变速率和变形温度的变化规律可以用材料的本构方程来表征,变形激活能为Q=300 k J/mol。

关键词：钛合金等温压缩流变应力本构方程

高温合金超薄带材屈服轨迹的晶粒尺度依赖性研究

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稀有金属材料与工程 2022年第7期51卷 2591-2598页

作者：王彦菊杨宇万敏贾崇林沙爱学孟宝中国航发北京航空材料研究院航空及发动机材料应用评价中心北京100095 北京航空航天大学机械工程及自动化学院北京100191 中国航发北京航空材料研究院先进高温结构材料重点实验室北京100095

为了研究高温合金超薄带材屈服轨迹的晶粒尺度依赖性,通过单向拉伸试验和不同加载比例的双向拉伸试验获得了不同厚度和晶粒尺寸的高温合金超薄带材的实验屈服轨迹。结果表明,随着高温合金带材晶粒尺寸的增大,屈服轨迹整体向内收缩,且形... 详细信息

为了研究高温合金超薄带材屈服轨迹的晶粒尺度依赖性,通过单向拉伸试验和不同加载比例的双向拉伸试验获得了不同厚度和晶粒尺寸的高温合金超薄带材的实验屈服轨迹。结果表明,随着高温合金带材晶粒尺寸的增大,屈服轨迹整体向内收缩,且形状由椭圆形向方形转变,证明了高温合金带材屈服轨迹存在晶粒尺度依赖性。同时,评估了4种典型宏观屈服准则Mises、Hill48、Barlat89和Yld2000-2d预测不同厚度与晶粒尺寸高温合金带材屈服轨迹的能力,发现Yld2000-2d屈服准则预测精度最高,可以较为精确地描述不同厚度与晶粒尺寸高温合金超薄带材的屈服行为。

关键词：高温合金超薄带材双向拉伸试验屈服轨迹晶粒尺度效应