Microstructure evolution of 6252 armor steel under hypervelocity impact

被引：8
|
作者：
Wang, H. K. [1 ,2 ]
Li, Z. Z. [1 ,2 ]
Zhang, Z. H. [1 ,2 ]
He, Y. Y. [1 ,2 ]
Liu, A. J. [1 ,2 ]
Xu, Z. Q. [1 ,2 ]
Tan, Y. [1 ,2 ]
Cheng, X. W. [1 ,2 ]
机构：
[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
[2] Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R China
来源：
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING | 2022年 / 170卷
关键词：
Kinetic projectile; Hypervelocity impact; 6252 armor steel; Microstructure evolution; Phase transition; HIGH-STRENGTH; MECHANICAL-PROPERTIES; SHEAR-BAND; AUSTENITE; BEHAVIOR;
D O I：
10.1016/j.ijimpeng.2022.104356
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
6252 armor steel is an improved version of 685 armor steel, with a high tensile fracture strength 1700 MPa. In this study, 6252 armor steel was used as the impact target, and 10 gs of spherical 93 W and 30CrMnSiA were used as the projectile. The impact velocities were designed to be 1.0 km/s, 1.5 km/s, 2.0 km/s and 2.5 km/s. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron backscatter diffraction (EBSD) were used to study microstructural changes in the armor steel. It was found that when the impact pressure was less than 27.75 GPa, no phase transition or twinning was observed in the target plate. When the impact pressure was greater than 27.75 GPa, phase transition occurred. The phase transition evolution was martensite -> austenite -> bainite +martensite/austenite islands +martensite. Twins also occurred when the impact pressure was greater than 27.75 GPa. Ledeburite was revealed in the projectile residue when the impact pressure was greater than 47.80 GPa. The grain orientation was more uniform than the original one, and more small-angle grain boundaries were observed.
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页数：9
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