EFFECTS OF GRAIN-BOUNDARY PHASES ON HYDROGEN EMBRITTLEMENT OF FE-NI-CR AUSTENITIC ALLOY BY INTERNAL FRICTION

Acta Metall Sin

2008, Vol. 44

Issue (9): 1095-1098 DOI:

Research Articles

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EFFECTS OF GRAIN-BOUNDARY PHASES ON HYDROGEN EMBRITTLEMENT OF FE-NI-CR AUSTENITIC ALLOY BY INTERNAL FRICTION

Jian ZHANG;;;

中国科学院金属研究所特殊环境材料研究部

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Jian ZHANG. EFFECTS OF GRAIN-BOUNDARY PHASES ON HYDROGEN EMBRITTLEMENT OF FE-NI-CR AUSTENITIC ALLOY BY INTERNAL FRICTION. Acta Metall Sin, 2008, 44(9): 1095-1098 .

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Abstract Dynamic mechanical analyzer (DMA) was used to investigate the hydrogen embrittlement of two Fe-Ni-Cr austenitic alloys. The effects of hydrogen and grain-boundary phases on internal friction of the alloys were analyzed. Optical microscopy and scanning electron microscopy were used to observe the microstructures and grain-boundary phases. The results show that abundant Ni3Ti phases and little carbides precipitated at grain boundaries in the alloy without boron, while and only little Ni3Ti phase and carbides precipitated at grain boundaries in the alloy with boron. Thermal hydrogen charging caused two new internal friction peaks at about 27℃ and 36℃ in the alloys with and without boron respectively, and the peaks were resulted from the interaction between hydrogen atoms and the interfaces of grain-boundary phases. Boron decreased the temperature of hydrogen-induced internal friction peaks, indicating that the diminishing in grain-boundary phase by boron reduced the ability of grain boundary to trap hydrogen atoms. As a result, boron lowered the ductility loss of the alloy.

Key words: internal friction hydrogen embrittlement austenitic alloy

Received: 15 January 2008

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