充氢Cr-Mo钢变形过程的声发射特征
发布时间：2018-12-18 00:31
【摘要】：对电化学充氢后的2.25Cr-1Mo钢进行拉伸实验,并在实时拉伸过程中采集声发射信号。结果表明:充氢后2.25Cr-1Mo钢抗拉强度为536.30MPa,下降约57MPa;断面收缩率为43.62%,下降约7%。拉伸断口上出现由氢脆引起的"白点"特征与准解理断裂形貌。充氢后试样拉伸过程弹性阶段的声发射信号活动增强,而屈服阶段的声发射信号活动减弱,变形过程的声发射信号累积绝对能量值要比未充氢试样低约1个数量级。充氢试样拉伸产生的声发射信号比未充氢试样的信号幅值降低约0.33mV,频宽降低0.06MHz。通过对声发射信号的分析发现,充氢试样变形的微观机制为氢促进位错发射与运动,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.
【作者单位】： 北京航空航天大学材料科学与工程学院;中国空间技术研究院;
【基金】：国家重点研发计划资助项目(2016YFC0801900)
【分类号】：TG142.15
本文编号：2385014
[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.
【作者单位】： 北京航空航天大学材料科学与工程学院;中国空间技术研究院;
【基金】：国家重点研发计划资助项目(2016YFC0801900)
【分类号】：TG142.15
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