Plastic Strengthening Mechanism of Ultra-high Strength Steel under High-speed Impact of 7.62mm Pistol Cartridges

doi:10.3969/j.issn.1000-1093.2020.11.019

Abstract

Abstract: Ultra-high strength steel is widely used in military vehicles, special protective equipment and other fields. The plastic deformation and deformation mechanism of ultra-high strength steel under high-speed impact are analyzed. The high-speed impact test of 7.62 mm pistol cartridge against a ultra-high steel target was conducted. The elongation and section shrinkage of ultra-high strength steel at a strain rate of 10⁴ s^-1 are calculated by using the surface reconstruction method. The microstructure analysis is used to explore the deformation mechanism of the steel. The results show that the plastic deformability of the steel at 10⁴ s^-1 is significantly improved compared with the static tensile test results. The deformation mechanism of the steel under high speed impact is a synergy of twinning and slippage. Meanwhile, the ultra-fine grains and uniformly dispersed strengthening phases further improve the plastic deformability of the steel under high-speed impact of bullets.

Key words: 7.62mmpistolcartridge, ultra-highstrengthsteel, high-speedimpact, elongation, metallographicstructure

CLC Number:

TG113.25⁺1

LI Tan， WANG Zhang， LI Zhaochang. Plastic Strengthening Mechanism of Ultra-high Strength Steel under High-speed Impact of 7.62mm Pistol Cartridges[J]. Acta Armamentarii, 2020, 41(11): 2313-2319.

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第41卷第11期2020 年11月
兵工学报ACTA ARMAMENTARII
Vol.41No.11Nov.2020

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