【摘要】：對(duì)電化學(xué)充氫后的2.25Cr-1Mo鋼進(jìn)行拉伸實(shí)驗(yàn),并在實(shí)時(shí)拉伸過程中采集聲發(fā)射信號(hào)。結(jié)果表明:充氫后2.25Cr-1Mo鋼抗拉強(qiáng)度為536.30MPa,下降約57MPa;斷面收縮率為43.62%,下降約7%。拉伸斷口上出現(xiàn)由氫脆引起的"白點(diǎn)"特征與準(zhǔn)解理斷裂形貌。充氫后試樣拉伸過程彈性階段的聲發(fā)射信號(hào)活動(dòng)增強(qiáng),而屈服階段的聲發(fā)射信號(hào)活動(dòng)減弱,變形過程的聲發(fā)射信號(hào)累積絕對(duì)能量值要比未充氫試樣低約1個(gè)數(shù)量級(jí)。充氫試樣拉伸產(chǎn)生的聲發(fā)射信號(hào)比未充氫試樣的信號(hào)幅值降低約0.33mV,頻寬降低0.06MHz。通過對(duì)聲發(fā)射信號(hào)的分析發(fā)現(xiàn),充氫試樣變形的微觀機(jī)制為氫促進(jìn)位錯(cuò)發(fā)射與運(yùn)動(dòng),而交叉滑移受到抑制。
[Abstract]:The tensile test of 2.25Cr-1Mo steel after electrochemical hydrogen charging was carried out, and the acoustic emission signals were collected in the process of real time drawing. The results show that the tensile strength of 2.25Cr-1Mo steel after hydrogen filling is 536.30MPa, which decreases about 57MPa, and the shrinkage of section is 43.62mm, which decreases about 7mm. The "white spot" characteristics and quasi-cleavage fracture morphology appeared on the tensile fracture surface caused by hydrogen embrittlement. After hydrogen charging, the AE signal activity in the elastic stage of the specimen is increased, but the AE signal activity in the yield stage is weakened, and the accumulated absolute energy of the AE signal in the deformation process is about 1 order of magnitude lower than that of the specimen without hydrogen charge. The amplitude of the AE signal and the frequency width of the hydrogen filled specimen are about 0.33 MV and 0.06 MHz, respectively, which are lower than those of the unfilled sample. By analyzing the acoustic emission signal, it is found that the micro-mechanism of deformation of hydrogen filled specimen is that hydrogen promotes dislocation emission and movement, while cross slip is restrained.
【作者單位】： 北京航空航天大學(xué)材料科學(xué)與工程學(xué)院;中國空間技術(shù)研究院;
【基金】：國家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(2016YFC0801900)
【分類號(hào)】：TG142.15

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