Residual stress and dynamic mechanical properties of swaging deformed tungsten alloy
LIN Zehua1, KANG Jun2, ZHOU Yonggui2, ZHOU Chengshang1, YAN Wenmin3
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Shenzhen Zhucheng Technology Co., Ltd., Shenzhen 518100, China; 3. Key Laboratory of Transient Shock Technology, No. 208 Research Institute of China Ordnance Industry, Beijing 102202, China
Abstract：95W-3.5Ni-1.5Fe tungsten alloy was prepared by cold isostatic pressing and vacuum sintering using W, Ni and Fe powders as raw materials. Then, the swaging processing with 15%, 30% and 40% deformation was carried out. Scanning electronic microscope with electron backscattered diffraction, split Hopkinson pressure bar and live-fire target test were used to analyze the microstructure, dynamic mechanical properties and residual stress distribution of 95W-3.5Ni-1.5Fe tungsten alloy. The results show that the W particles in the tungsten alloy deform from a spherical shape to an olive shape after swaging process. The static tensile strength and hardness (HRC) of the 40% deformation tungsten alloy increase from 983 MPa and 28.9 to 1 434 MPa and 46.1 HRC respectively, and the elongation decreases from 11.9% to 4.6%. There are residual compressive stresses in the alloy, which are mainly distributed between tungsten particles and in the Ni-Fe bonding phase. The deformed tungsten alloy has a higher strain rate of 4.9% under the impact strain rate of about 1.2×103 s-1, and exhibits “self-sharpening” when penetrating the steel target.
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2021, Vol. 26 
