7.62mm手枪弹高速冲击下超高强钢塑性强化机理

doi:10.3969/j.issn.1000-1093.2020.11.019

摘要/Abstract

摘要： 超高强钢越来越广泛地应用于军事车辆、装备防护等领域。为分析超高强钢在弹头高速冲击作用下的塑性变形及变形机理，开展了7.62 mm手枪弹高速冲击超高强钢靶板试验研究。运用曲面重构方法测量和计算超高强钢的延伸率和断面收缩率，并对超高强钢微观组织进行分析。结果表明：在10⁴ s^-1应变率下超高强钢塑性变形能力与静态拉伸试验结果相比显著提升；其变形机制由静态拉伸下的单一位错滑移运动，变为孪生和滑移协同作用；同时，超细晶粒和均匀弥散的强化相使得在高速冲击下晶粒塑性变形充分，进一步提高了超高强钢在弹头高速冲击作用下的塑性性能。

关键词: 7.62mm手枪弹, 超高强钢, 高速冲击, 延伸率, 金相组织

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

中图分类号:

TG113.25⁺1

李潭，王璋，李照昌. 7.62mm手枪弹高速冲击下超高强钢塑性强化机理[J]. 兵工学报, 2020, 41(11): 2313-2319.

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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