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EXTREME PROPERTIES OF FIBER COMPOSITES AND THEIRcryogenic APPLICATIONS

Acta Metallurgica Sinica(English Letters) 1997年第3期10卷 283-289页

作者： G. Hartwig(Forschungszentrum Karlsruhe, Germally D-76021 Karlsruhe, P.B.3640) Forschungszentrum Karlsruhe Karlsruhe Germany

Fiber-polymer composites exhibit extraordianary and unusual properties. Depending on the fiber type and arrangementt the following can be achieved: a very high tensile strength and stiffness or fatigue strength, a zero or negative thermal expension, a rather high damping capability and a very high thermal and electrical insulating performance. But even carbon fibers can be converted into excellent electrical conductors when calined with fluorine. However, the shear properties of fiber composites with a polymeric matrix are medium. Extreme mechanical and thermal cryogenic properties will be discussed and compared to those of other material classes. Special emphasis is put on present and future cryogenic applications including storage and transportation of hydrogen or liquefied gases. Gas permeation through composites afier mechani-cal and thermal cycling and modifications for a better performance will be *** trends for getting advanced materials will finish the presentation.

关键词： fiber-polymer composite cryogenic property thermal conductivity gas permeation

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cryogenic MECHANICAL BEHAVIOUR OF MARAGING STEEL CONTAINING HYDROGEN

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Acta Metallurgica Sinica(English Letters) 1991年第1期4卷 47-54页

作者： LIU Zhonghao CHEN Lian Institute of Metal Research,Academia Sinica,Shenyang,China

Within the range of 77 to 295 K,the strength and plastieity of 18Ni maraging steel increase with decreasing temperature and decrease with increasing hydrogen *** susceptibility to hydrogen embrittlement of the maraged specimens is superior to solid solution *** dislocations after plastically deforming will tangle into dislocation cells which reduce thermselves in size as the temperature decreases,and coarsen as the hydrogen content in- *** cryogenie deformation twin was *** tensile fracture surfaces of the solu- tion and maraged specimens containing 5.90 ppm hydrogen under 295 to 223 K are revealed as quasi-cleavage and intergranular features respectively and as transgranular ones under other experimental *** influence of hydrogen on the mechanical behaviour of steel and the mechanism of hydrogen induced deformation and fracture are discussed. Research Assistant, Institute of Metal Research,Academia Sinica, Shenyang 110015,China

关键词： maraging steel fracture hydrogen embrittlement cryogenic property

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