摘要
利用CSS4410型电子万能材料试验机和Hopkinson拉杆研究这两种材料在室温下应变率范围在0.001～3 300 s-1的拉伸力学性能,结果表明:两种材料在不同应变率拉伸载荷下均有明显的应变硬化和颈缩现象;两种材料均表现出较强的应变率敏感性,并且材料Ⅰ的应变率敏感性强于材料Ⅱ。最后利用扫描电镜(SEM)对两种材料应变率在0.001 s-1和3300 s-1下的拉伸断口进行观察,发现试样的断口形貌均为杯锥状,剪切唇区的面积比例随应变率的提高而增大,表现出一定的应变率相关性。
This paper employs the CS4410 mechanical test machine and Hopkinson tensile bar to carry out the tensile test with the strain rate ranging from 0.001 s-1 to 3300 s-1.Results show that there are evident strain hardening and necking phenomena for both materials at different strain rates;both materials all exhibit comparable strain rate sensitivity and the material Ⅰ is more sensitive than the material Ⅱ.In the end,tension fracture surface of strain rate 0.001 s^-1 and 3 300 s^-1 is studied by using the SEM,and observations of the cup and cone fracture surface reveal that shear zone area ratio increases with the strain rate.
出处
《兵器材料科学与工程》
CAS
CSCD
2009年第4期31-35,共5页
Ordnance Material Science and Engineering
基金
国防基础预研项目
关键词
超高强度钢
动态拉伸
应变率
应变硬化
断口形貌
ultra-high strength steel
dynamic tension
strain rate
strain hardening
fracture morphology
