静载拉伸45钢材料的金属磁记忆信号分析  

Metal Magnetic Memory Testing Signals of 45 Carbon Steel During Static Tension Process

作　　者：王丹[1] 董世运[1] 徐滨士[1] 陈群志[2] 董丽虹[1] 

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072 [2]北京航空技术研究中心,北京100076

出　　处：《材料工程》2008年第8期77-80,共4页Journal of Materials Engineering

基　　金：国家自然科学基金项目(50505052);再制造重点实验室基金项目(9140C85010106JS9101);国家自然科学基金重点项目(50735006)

摘　　要：研究了静载拉伸过程中三种规格45钢轴状试件表面法向磁场强度Hp(y)值的变化规律,并对Hp(y)曲线斜率的绝对值|k|与拉应力σ之间的对应关系进行了分析。结果表明:试件规格相同时,|k|-σ的对应关系相同,即弹性范围内,|k|随σ的增加而增大;加载至屈服极限附近时,|k|出现最大值;进入塑性变形阶段后,|k|出现减小的趋势;拉断后,Hp(y)曲线在断口附近发生折转,并在断口两侧出现峰值。试件规格不同时,受载区域长度对|k|-σ关系影响显著,即所受拉应力相同,受载区域的长度增大,|k|减小。The variations of the magnetic intensity, Hp（y）, on the direction perpendicular to the surface of 45 carbon steel tensile specimens with shaft-shaped geometry and three different dimensions were determined during the static tension testing by using the metal magnetic memory. The relationship between the tension stress σ and the absolute value of slope of Hp（y） curve ｜k｜ was investigated. In the full elastic range, experimental results showed that, when the dimension of the specimens was given, the magnitude of ｜k｜ increased with increasing the loading magnitude. However, near the yield limit in the plastic range, the slope reached a local maximum and then decreased. After abruption, an abrupt change in Hp（y） curve occurred near the fracture surface. When the dimensions of the specimens were different, the relationship between σ and ｜k｜ was significantly influenced by the length of the specimens. Results showed that with increasing of the specimen length, the magnitude of ｜k｜ decreased.

关 键 词：金属磁记忆 静载拉伸 磁场强度 斜率 多规格 

分 类 号：TG115.28[金属学及工艺—物理冶金]