材料期刊网

DEFORMATION AND FRACTURE MECHANISMS OF TWO-PHASE TiAl-BASED ALLOYS WITH FULLY LAMELLAR MICROSTRUCTURE

Y. G .Zhang , C. Q. Chen (Beijing University of Aeronautics and Astronautics , Beijing 100083 , China)Q. Xu (Beijing Laboratory of Electron Microscopy , Chinese Academy of Sciences. Beijing , China)M. C. Chaturvedi (The University of Manitoba , Winnipeg , Manitoba , Canada R3T 2N2)

金属学报(英文版)

A two-phase TiAl-based alloy with fully lamellar structure has been deformed al room temperature and the deformed microstructures have been examined in dtails by optical microscopy(OM), scanning electron microscopy(SEM) and transmission electron microscopy(TEM) . Deformation mechanisms in the γ-TiAl phase has been defined and the role of grain boundaries in the deformation and fracture has been assessed Some of the mechanisms of interactions between twinning or gliding dislocations and three types of γ γ domain boundaries or γ α_2 interface in a lamellar grain have been identified and resistance of the various domain boundaries or the interface to the propagation of twinning has been evaluated

关键词: :TiAl , null , null , null

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英文）

关键词:

Abstracts of papers from Journal of University of Science and Technology Beijing

稀有金属（英文版）

关键词:

CORRELATION BETWEEN STRESS COMPONENTS AND STRESS CORROSION CRACKS IN BRASS Lecturer,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China

QIAO Lijie LIU Rui XIAO Jimei University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

The effects of stress components on nucleation sites and propagation directions of stress cor- rosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. The results indicated that under mode Ⅱ loading,stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendieular to the maximum normal stress,under mode Ⅲ loading,the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentra- tion,while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10—150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.

关键词: stress corrosion cracking , null , null , null

Q相-C2S-C4AF-C12A7系列水泥形成的研究

姜奉华 , 徐德龙

硅酸盐通报 doi:10.3969/j.issn.1001-1625.2004.06.006

通过研究Q相与C2S和Q相与C4AF的共存条件,构造Q相-C2S-C4AF水泥系统,对此系统水泥形成条件进行研究.研究表明:Q相与C2S和Q相与C4AF能够共存,可以组成Q相-C2S-C4AF-C12A7水泥系统.在Q相-C2S-C4AF-C12A7水泥系统中,Q相在1270℃开始生成,随着温度的升高,Q相的生成量逐渐增大;采用V2O5对β-C2S具有较好的稳定作用.随着C4AF量的增加,Q相的量也在增加,同时,烧成温度降低.

关键词: Q相 , Q相-C2S-C4AF水泥 , 形成条件 , 抗压强度

Q460C热处理挽救工艺

刘军刚

物理测试

Q460C钢板由于冶炼和轧制工艺不稳定,经常出现伸长率不合格的问题.论述了不同的热处理工艺对Q460C性能的影响.研究表明:Q460C经过正火后,强度明显降低.经过正火控冷后,强度、韧性均满足生产要求,提高了产品合格率.

关键词: Q460C , 热处理 , 力学性能

Q460C连铸板坯的高温塑性

段双霞 , 孙建林 , 李志恩 , 富平原 , 雷爱民

钢铁研究学报

在Gleeble-1500热模拟机上测定了Q460C连铸坯的热塑性,深入分析了钢Q460C的高温脆化机理,确定了连铸坯的最佳矫直温度.结果表明,钢Q460C高温脆化受变形速率的影响较大,在第Ⅲ脆性区变形速率越低脆化越严重,实验用钢Q460C的低塑性区确定在660～985℃,连铸坯顶弯、矫直温度应高于985℃,有利于提高塑性,避免连铸坯表面裂纹的产生.

关键词: Q460C连铸板坯 , 热模拟 , 高温塑性

Q460C连铸板坯的高温塑性

段双霞 , 孙建林 , 李志恩 , 富平原 , 雷爱民

钢铁研究学报

在Gleeble1500热模拟机上测定了Q460C连铸坯的热塑性，深入分析了钢Q460C的高温脆化机理，确定了连铸坯的最佳矫直温度。结果表明，钢Q460C高温脆化受变形速率的影响较大，在第Ⅲ脆性区变形速率越低脆化越严重，实验用钢Q460C的低塑性区确定在660~985 ℃，连铸坯顶弯、矫直温度应高于985 ℃，有利于提高塑性，避免连铸坯表面裂纹的产生。

关键词: Q460C连铸板坯;热模拟;高温塑性

Q345C钢板表面裂纹金相分析

潘红涛

物理测试 doi:10.3969/j.issn.1001-0777.2007.01.012

文章对Q345C钢板表面产生的裂纹进行了宏观和光学显微镜分析.结果显示:裂纹产生的原因是加热之后在轧制过程中形成的折叠,1号裂纹上出现的大型杂质有可能是压入的氧化铁皮.

关键词: 表裂 , 形状 , 组织

Q相-C2S-C4AF-C12A7水泥作为膨胀剂的研究

姜奉华 , 徐德龙

硅酸盐通报 doi:10.3969/j.issn.1001-1625.2005.04.026

采用普通硅酸盐水泥作为基体、Q相-C2S-C4AF-C12A7水泥作为膨胀剂、加入少量石膏的条件下进行试验研究.研究表明:Q相-C2S-C4AF-C12A7水泥能够作为膨胀组分,调节Q相-C2S-C4AF-C12A7水泥和SO3的量,能够得到所要求的膨胀水泥.从DTA和XRD得知,其膨胀源主要是钙矾石(AFt),它形成的速度及数量,可以通过控制Q相-C2S-C4AF-C12A7水泥和SO3的量来实现.

关键词: 膨胀水泥 , 膨胀剂 , 微观分析 , 钙矾石