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Effects of nano-y_2o_3 and Sintering Parameters on the Fabrication of PM Duplex and Ferritic Stainless Steels

Acta Metallurgica Sinica(English Letters) 2016年第1期29卷 58-71页

作者： R.Shashanka D.Chaira Department of Metallurgical and Materials Engineering National Institute of Technology

Here we report the effects of nano-y203 addition, sintering atmosphere and time during on the fabrication of PM duplex and ferritic stainless steels composites by dual-drive planetary milling of elemental Fe, Cr and Ni powders followed by conventional pressureless sintering. yttria-free and yttria-dispersed duplex and ferritic stainless steels are fabricated by conventional sintering at 1000, 1200 and 1400 ℃ temperatures under argon atmosphere. In another set of experiment, yttria-free and yttria-dispersed duplex and ferritic stainless steels are consolidated at 1000 ℃ for l h under nitrogen atmosphere to study the effect of sintering atmosphere. It has been found that densities of duplex and yttria- dispersed duplex stainless steel increase from 71% to 91% and 78% to 94%, respectively, with the increase in sintering temperature. Similarly, hardness value increases from 257 to 567 HV25 in case of duplex, and from 332 to 576 HV25 in yttria-dispersed duplex stainless steel. X-ray diffraction analysis shows the domination of more intense austenite phase than ferrite at higher sintering temperature and also in nitrogen atmosphere. It is also evident that addition of yttria enhances phase transformation from a-Fe to 7-Fe. Duplex and yttria-dispersed duplex stainless steels exhibit the maximum com- pressive yield strength of 360 and 312 MPa, respectively.

关键词： nano-y2o3 Composites Stainless steel Powder metallurgy (PM) Mechanical properties Microstructure Phase transitions

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Microstructure and tensile properties of Mo alloy synthetically strengthened by nano-y_2o_3 and nano-Ceo_2

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Rare Metals 2014年第1期33卷 58-64页

作者： Ren-Zhi Liu Kuai-She Wang Peng-Fa Feng Geng An Qin-Li yang Hu Zhao Institute of Metallurgy Xi’an University of Architecture and Technology Laboratory of Molybdenum Metal and Its Processing Jinduicheng Moly Co. Ltd State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University

nano-y2o3 and nano-Ceo2 of different weight ratio mixed with deionizing water were doped into Moo2 powder by liquid-solid doping method. The diameter 1.80 and 0.18 mm alloy wires of Mo-0.3y, Mo-0.3Ce, and Mo-0.15y-0.15Ce were prepared through reduction, iso- static pressing, sintering, and drawing. Tensile properties, second phase microstructure and fracture surface appear- ance of wires were analyzed. The better refining effect for Mo alloy powder can be gotten after two kinds of nano- particle oxide doped into Moo2 than only one doped. nano-y2o3 and nano-Ceo2 have different influences on sintering process. For nano-Ceo2, the constraining effect of grain growth focuses on the initial sintering stage, nano- y2o3 plays refining grains roles in the later densification stage. nano-y2o3 is undistorted and keeps intact in the process of drawing; and nano-Ceo2 is elongated and bro- ken into parts in the drawing direction. The strengthening effect of nano-y2o3 and nano-Ceo2 keeps the finer grains and superior tensile properties for Mo-0.15y-0.15Ce wire.

关键词： nano-y2o3 nano-Ceo2 Mo alloy wire Microstructure Tensile property Fracture surface

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聚丙烯/超支化聚酰胺接枝纳米y2o3复合材料的力学性能

聚丙烯/超支化聚酰胺接枝纳米Y2O3复合材料的力学性能

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2012年全国高分子材料科学与工程研讨会

作者：周红军谢山尹国强林轩郭清兵仲恺农业工程学院化学化工学院

聚烯烃/无机纳米粒子复合材料是近些年的研究热点之一,但无机粒子在聚合物基体中的分散与界面黏结是必须解决的问题。超支化聚合物分子结构独特,具有非晶、低黏度、分子链间无缠绕等不同于线性聚合物的物化特性,在纳米粉体的改性方面得... 详细信息

聚烯烃/无机纳米粒子复合材料是近些年的研究热点之一,但无机粒子在聚合物基体中的分散与界面黏结是必须解决的问题。超支化聚合物分子结构独特,具有非晶、低黏度、分子链间无缠绕等不同于线性聚合物的物化特性,在纳米粉体的改性方面得到了广泛的应用

关键词： polypropylene hyperbranched poly(amine-ester)s nano-y2o3 compatibilizer

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