不同碳钢在塑性变形与裂纹扩展中的声发射研究  

Acoustic emission characteristic of different carbon steel during plastic deformation and crack propagation

作　　者：欧阳浩[1] 石健[1] 唐通[1] OUYANG Hao SHI Jian TANG Tong(Mechatronic Engineering College, Southwest Petroleum University, Chengdu 610500, China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500

出　　处：《兵器材料科学与工程》2017年第1期93-97,共5页Ordnance Material Science and Engineering

基　　金：国家自然科学基金(11102173;51134004);石油天然气装备教育部重点实验室开放基金(OGE201402-03)

摘　　要：利用声发射技术对30Cr Mo与35Cr Mo结构钢紧凑拉伸试样进行相关研究。通过声发射的振铃计数和能量计数,研究两种不同含碳量、不同拉伸速度下的声发射特征参数与塑性变形的关系,结合荷载-位移曲线对声发射振铃计数率和能率进行分析。结果表明:含碳量指标对声发射信号特征参数有影响;30Cr Mo钢的声发射信号在整个过程中较为平稳,35Cr Mo钢在变形中后期的信号多于前期信号;声发射能量与振幅参数具有近似对数关系ln E=a+bx,式中b值与含碳量有关。The compact tension specimens of 30CrMo and 35CrMo structural steel were studied by acoustic emission（AE）technique. The relationship between AE parameters and plastic deformation was studied by AE count and AE energy for different carbon content and different tensile speeds. With load-displacement curve,the AE characteristic was analyzed. The results show that carbon content index has an effect on AE signal characteristic parameters. The count and energy signals of 30CrMo are more stable during the whole process,and the acoustic emission signals of 35CrMo in the middle and late stages of deformation are more than that in the previous stage. The energy of acoustic emission has an approximate logarithmic relationship with the amplitude parameter（ln E=a＋bx）,and the b value in the formula is related to the carbon content.

关 键 词：声发射技术 碳含量 应变速度 断裂 

分 类 号：TB31[一般工业技术—材料科学与工程]