材料期刊网

INVESTIGATIONS ON THE FORMATION OF INITIAL CRACKS IN THERMAL BARRIER COATINGS PREPARED BY EB-PVD

S.K.Gong , L. Deng , F.S.Liu and H.B.Xu(Department of Material Science and Engineering , Beijing University of Aeronautics and Astronautics , Beijing 100083 , China Manuscript received 26 August 1996)

金属学报(英文版)

This paper deals with the mechanism of the formation of initial cracks in the yttria partially stabilized zirconia thermal barrier coatings prepared by EB-PVD method.The microcracks were only recognized inside the ceramic top coat of the thermalcycled TBCs. SEM/EDS observations indicated that some special oxides exist in the area just below the cracks.It seems that the formation of the initial cracks can result from the oxidation stress as well as the thermal stress.

关键词: :TBCs , null , null , null

Study on β-TCP Coated Porous Mg as a Bone Tissue Engineering Scaffold Material

Fang Geng

材料科学技术（英）

Three-dimensional honeycomb-structured magnesium (Mg) scaffolds with interconnected pores of accurately controlled pore size and porosity were fabricated by laser perforation technique. Biodegradable and bioactive β- tricalcium phosphate (β-TCP) coatings were prepared on the porous Mg to further improve its biocompatibility, and the biodegradation mechanism was simply evaluated in vitro. It was found that the mechanical properties of this type of porous Mg significantly depended on its porosity. Elastic modulus and compressive strength similar to human bones could be obtained for the porous Mg with porosity of 42.6%-51%. It was observed that the human osteosarcoma cells (UMR106) were well adhered and proliferated on the surface of the β- TCP coated porous Mg, which indicates that the β-TCP coated porous Mg is promising to be a bone tissue engineering scaffold material.

关键词: Magnesium , Bone tissue engineering , β-TCP coating , Biocompatibility

Study on beta-TCP Coated Porous Mg as a Bone Tissue Engineering Scaffold Material

材料科学技术（英）

Three-dimensional honeycomb-structured magnesium (Mg) scaffolds with interconnected pores of accurately controlled pore size and porosity were fabricated by laser perforation technique. Biodegradable and bioactive beta-tricalcium phosphate (beta-TCP) coatings were prepared on the porous Mg to further improve its biocompatibility, and the biodegradation mechanism was simply evaluated in vitro. It was found that the mechanical properties of this type of porous Mg significantly depended on its porosity. Elastic modulus and compressive strength similar to human bones could be obtained for the porous Mg with porosity of 42.6%-51%. It was observed that the human osteosarcoma cells (UMR106) were well adhered and proliferated on the surface of the beta-TCP coated porous Mg, which indicates that the beta-TCP coated porous Mg is promising to be a bone tissue engineering scaffold material.

关键词: Magnesium;Bone tissue engineering;beta-TCP coating;Biocompatibility;simulated body-fluid;mechanical-properties;cancellous bone;foam;scaffolds;magnesium;hydroxyapatite;porosity;bioceramics;fabrication;ph

Department of Metallurgy and Materials Engineering of Chongqing University

YAN Guangting Chongqing University , Sichuan , China.

材料科学技术（英）

关键词:

热处理对Fv520(B)钢抗H2S应力腐蚀性能的影响

乔桂英

钢铁

采用TEM、XRD、SEM等手段研究了Fv520(B)钢经过1 050℃固溶处理后,在750～850℃温度范围内中间调整处理对力学性能和抗H2S应力腐蚀性能的影响.结果表明:随调整处理温度的降低、时效温度的升高,钢的强度降低,抗H2S应力腐蚀性能提高.抗H2S应力腐蚀性能与残余奥氏体量有关.

关键词: Fv520(B)钢 , 力学性能 , SCC

时效处理对Fv520（B）钢抗H2S应力腐蚀性能的影响

萧福仁 , 乔桂英 , 谭朝鑫

中国腐蚀与防护学报

采用X射线衍射、TEM、SEM等研究了时效温度对Fv520(B)钢组织、力学性能及抗H2S应力腐蚀性能的影响。结果表明：在470～620℃时效温度范围内，随温度升高，该钢的强度下降，残余奥氏体含量增加，抗H2S应力腐蚀能力增强。该钢抗H2S应力腐蚀性能与时效相形态、马氏体基体回火程度及残余数量有关。

关键词: Fv520(B）钢 , aging , stress corrosion

A STUDY OF B-P UNIFIED VISCOPLASTIC CONSTITUTIVE MODEL

M. Zhao , G. Zhang , K.S. Zhang

金属学报(英文版)

By combining the Bodner-Partom constitutive model and equivalent stress function,finite element methods and program on analyzing non-elastic deformation and stressfor thermal viscoplastic material are studied in this paper, and it's the first timethat this material model is used in a kind of engineering software-MARC. Thermalviscoplastic behavior of high temperature alloy GH536 specimen with gap is analyzedby this program. The research results show it is feasible to analyze thermal viscoplasticbehavior of specimen or structure by applying B-P model.

关键词: effective stress function(ESF) , null

Huazhong University of Science and Technology(H.U.S.T)

材料科学技术（英）

关键词:

Investigation on the H2S-resistant behaviors of acicular ferrite and ultrafine ferrite

Materials Letters

Hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) of both acicular ferrite and ultrafine ferrite in H2S environments were evaluated. The results show that the two microstructures have the optimum HIC resistance as well as the good mechanical properties. Moreover, acicular ferrite has the better SSC resistance than ultrafine ferrite. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词: pipeline steel;microstructure;hydrogen-induced cracking;HIC;sulfide;stress cracking;SSC;sulfide stress cracking;low-alloy steels;pipeline steel;high-strength;resistance

FV（520）B不锈钢在CO2/H2S共存条件下的腐蚀行为

郎经纬 , 杜晓东 , 金绍彤 , 王夫成 , 詹马骥 , 周丹 , 沈健 , 刘光复

表面技术 doi:10.16490/j.cnki.issn.1001-3660.2016.07.005

目的：研究长输管线压缩机叶片材料FV(520)B不锈钢在高含H2S、H2O、CO2条件下的腐蚀行为。方法利用高温高压反应釜模拟特定工况，在H2S分压为0.9 MPa、CO2分压为0.6 MPa、温度为150℃的条件下于5 g/L的氯化钠溶液中制备硫化腐蚀层，利用XPS、SEM、XRD等手段对腐蚀层的成分及结构进行分析。结果 FV(520)B不锈钢的腐蚀速率逐渐降低，试样表面粗糙度先增大后下降，腐蚀产物主要为FeCO3、Fe3O4、FeS、FeS2、S、Cr2S3、Cr2O3和Cr(OH)3。结论在腐蚀前期，FeS的形成速率大于 FeS2、S，腐蚀产物颗粒不断长大。形成完整的 Cr2O3、Cr(OH)3保护膜后，腐蚀得到抑制，此时腐蚀反应主要为FeS2、S的生成，试样表面腐蚀产物颗粒尺寸变小，试样表面粗糙度降低。

关键词: FV(520)B不锈钢 , 硫化腐蚀 , H2S , CO2