不同拉伸损伤状态下45钢表面磁畴观测  

Observation of Magnetic Domains on the Surface of 45 Steel under Different Tensile Damage States

作　　者：张冰琦 雷经发 邬竞雄 刘涛 ZHANG Bingqi;LEI Jingfa;WU Jingxiong;LIU Tao(School of Mechanical and Electrical Engineering,Anhui Jianzhu University,Hefei 230601,China)

机构地区：[1]安徽建筑大学机械与电气工程学院,安徽合肥230601

出　　处：《安徽建筑大学学报》2021年第1期73-77,共5页Journal of Anhui Jianzhu University

基　　金：国家自然科学基金项目(51165020,51565029)。

摘　　要：为明确铁磁材料在拉伸损伤过程中磁特征变化规律,以45钢试样为对象开展准静态拉伸实验。选用粉纹法进行不同拉伸损伤状态下45钢试样的磁畴观测。实验结果表明:45钢退火试样金相组织中含有珠光体和铁素体。在未施加载荷时,其表面的微观磁畴结构排列无序、分布较为杂乱。随着拉伸的进行,45钢试样磁畴组织由180°畴、点状畴等形态转变为迷宫畴、90°畴,拉应力的增加破坏了系统局部能量平衡,使得磁畴间距逐渐变大,畴壁宽度逐渐变小。In order to clarify the variation of magnetic characteristics of ferromagnetic materials in the process of tensile damage,quasi—static tensile tests were carried out on 45 steel samples.The powder-pattern method was applied to observe the magnetic domain of 45 steel samples under different tensile damage states.The results show that the metallographic structure of annealed 45 steel samples contains pearlite and ferrite.When no load is applied,the micro domain structure is disorderly arranged and distributed randomly.With the continuous implementation of tensile test,the magnetic domain structure of 45 steel sample changes from 180°domain and dotted domain to labyrinth domain and 90°domain.The increase of tensile stress destroys the energy balance of the system,which makes the domain spacing become larger and the domain wall width smaller.

关 键 词：拉伸损伤 金相组织 磁畴观测 

分 类 号：TH140.7[一般工业技术—材料科学与工程]