细晶钨合金的绝热剪切敏感性  

Formation mechanics of adiabatic shear band for fine-grain tungsten heavy alloy

作　　者：刘桂荣[1] 王玲[1] 周武平[1] 苏维丰[1] 裴燕斌[1] 

机构地区：[1]钢铁研究总院安泰科技股份有限公司,北京100081

出　　处：《粉末冶金材料科学与工程》2009年第5期295-298,共4页Materials Science and Engineering of Powder Metallurgy

基　　金：国家"十五二批"重点支撑项目(MKPT-2004-09ZD)

摘　　要：采用粉末冶金法制备平均晶粒度<5μm的细晶90W-Ni-Fe合金。利用HOPKINSON压杆装置,分别在0.9MPa和1.4MPa的冲击气压条件下对该合金进行一维应力冲击实验,并对冲击后的样品进行金相组织观测,考察其在一维应力冲击条件下的绝热剪切性能,分析细晶钨合金的绝热剪切敏感性。研究表明:晶粒细化有助于绝热剪切带的扩展,可以提高钨合金绝热剪切敏感性,使得烧结态细晶钨合金在一维冲击应力加载条件下就可以产生绝热剪切带。随着冲击(加载)气压的加大,绝热剪切现象更明显,冲击气压为1.4MPa时剪切带宽度约为10μm,从而有助于材料在动态压缩条件下产生绝热剪切破坏,提高材料在穿甲过程中的"自锐"能力。The fine-grain 90W-Ni-Fe heavy alloy with average grain size less than 5 μm and sintering density over than 99% has been fabricated by powder metallurgy, and dynamic shearing experiment has been done by using the technology of HOPKINSON bar and d8 mm×50 mm specimen, of which the hit pressure was 9×105 Pa and 14×105 Pa, respectively. The microstructure was examined by scanning electron microscopy. The test results show that the fine-grain tungsten is easier to form adiabatic shear band than the general general sintered tungsten alloy, and the fine-grain can make the adiabatic shear band extend easier. The fine-grain tungsten alloy may has more chance for the armour-piercing projectile to form good penetration performance.

关 键 词：细晶钨合金 绝热剪切 动态压缩 微观分析 

分 类 号：TG146.4[一般工业技术—材料科学与工程]