3V合金;硼含量;晶粒尺寸;環(huán)境氫脆"/>

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硼含量對有序態(tài)(Fe,Co)3V合金環(huán)境氫脆的影響
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上海大學 材料研究所,上海大學 材料研究所,上海大學 材料研究所

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中圖分類號:

TG146.1, TG172

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國家自然科學基金資助(項目號51271102)


Effect of B content on environmental embrittlement of ordered (Fe,Co)3V alloys
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Institute of Materials Science,Shanghai University,Shanghai,Institute of Materials Science,Shanghai University,Shanghai,Institute of Materials Science,Shanghai University,Shanghai

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    摘要:

    通過在真空和氫氣環(huán)境下的拉伸實驗，研究了硼含量對有序態(tài)(Fe,Co)3V合金力學性能和環(huán)境氫脆的影響。研究結(jié)果表明，當在有序態(tài)(Fe,Co)3V合金中添加0.02 wt.%B時，相對于無硼合金，合金的晶粒尺寸減小了27.5 %，合金在真空和氫氣中的抗拉強度和延伸率均達到最大值；而當硼含量繼續(xù)增加時，合金的晶粒尺寸、合金在真空和氫氣中的力學性能均保持不變。無硼有序態(tài)(Fe,Co)3V合金在氫氣中呈現(xiàn)嚴重的環(huán)境氫脆，當在合金中添加0.02 wt.%B后，合金氫脆因子降低了34.4 %，合金的斷口形貌由完全沿晶斷口轉(zhuǎn)變?yōu)榇┚Ш脱鼐У幕旌蠑嗫?；當合金中的硼含量繼續(xù)增加時，合金的氫脆因子不再降低，恒定在50 %左右，即硼原子只能部分抑制有序態(tài)(Fe,Co)3V合金在氫氣中的環(huán)境氫脆。

    Abstract:

    The mechanical properties and environmental embrittlement of ordered (Fe,Co)3V alloys doping with various boron content have been investigated when tensile tested in vacuum and 1 kPa H2. The results show that the grain size of the ordered (Fe,Co)3V alloy doped with 0.02 wt.%B decreased by 27.5 % compared with boron-free (Fe,Co)3V alloy, while the tensile strength and elongation reached the maximum. However, as the boron content in the ordered (Fe,Co)3V alloy exceeds 0.02 wt.%, the grain size and mechanical properties remain unchanged when tensile tested in vacuum and hydrogen gas. The ordered boron-free (Fe,Co)3V alloy exhibits severe brittleness in hydrogen gas. By adding 0.02 wt. %B the hydrogen embrittlement factor of the ordered (Fe,Co)3V alloy decrease by 34.4 % and the fracture mode changes from full intergranular to mixed fracture of intergranular and transgranular. But when boron content increases continuously in the ordered (Fe,Co)3V alloy, the hydrogen embrittlement factor keeps about 50 %, indicating boron cannot completely suppress the environmental embrittlement of the ordered (Fe,Co)3V alloy in hydrogen.

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楊彪,陳業(yè)新,李樹龍.硼含量對有序態(tài)(Fe, Co)3V合金環(huán)境氫脆的影響[J].稀有金屬材料與工程,2018,47(3):976~981.[Yang Biao, Chen Ye-xin, Li Shu-long. Effect of B content on environmental embrittlement of ordered (Fe, Co)3V alloys[J]. Rare Metal Materials and Engineering,2018,47(3):976~981.]
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  • 收稿日期:2016-01-18
  • 最后修改日期:2016-03-21
  • 錄用日期:2016-03-30
  • 在線發(fā)布日期: 2018-04-11
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