摘要
采用声发射技术,对四种不同晶粒度20~#钢试件的单轴拉伸过程进行监测,探究不同晶粒度对于金属材料损伤过程中声发射特性的影响。试验结果表明:声发射信号的幅值、能量和撞击计数等特征参数能够很好地描述材料不同晶粒度大小对材料拉伸过程中声发射特性的影响。细晶粒试件声发射信号数较少,强度较低,随着试件晶粒度的增大,声发射信号的强度和活性呈现明显增加的趋势。说明粗晶粒试件力学性能劣化严重,拉伸过程极易损伤,因此,试验结果也反映了金属材料微观损伤过程中声发射与材料内部的损伤演化密切相关。
Acoustic emission(AE)testing technique was used for the monitoring of uniaxial tensile process of four different grain size of20#steel specimens,and for exploring the effect of different grain size on the acoustic emission characteristics in the process of metal material damage.The experimental results show that the characteristic parameters including amplitude,energy and hits can be used to describe the effect of different grain size on the AE characteristics during the tensile process.The fine grained specimens have small amounts AE signals,and low AE intensity,with the increase of the grain size,the intensity and the activity of the AE signal increase obviously.The result illustrates that the mechanical performance of coarse grain size specimens is serious,and they are susceptible to damage during stretching process,therefore,the experimental results also show that AE is closely related to the internal damage evolution of the material in the microscopic damage process of metallic materials.
作者
张颖
吴昊
高晗
王兵
张维
ZHANG Ying;WU Hao;GAO Han;WANG Bing;ZHANG Wei(Northeast Petroleum University, Daqing 163318, China;Daqing Chemical Research Center of China Petroleum and Petrochemical Research Institute, Daqing 163318, China;Hangzhou Special Equipment Inspection Institute, Hangzhou 310003, China)
出处
《应用声学》
CSCD
北大核心
2017年第3期228-233,共6页
Journal of Applied Acoustics
基金
黑龙江省博士后科研启动项目(LBH-Q14031)
东北石油大学培育基金项目(XN2014103)
关键词
声发射技术
晶粒度
拉伸过程
损伤演化
Acoustic emission technique
Grain size
Tensile process
Damage evolution
