Microstructural changes in high interstitial stainless austenitic steels due to ballistic impact

Berns, Hans; Riedner, Sascha; Gavriljuk, V.G.; Petrov, Yuri; Weihrauch, Achim

doi:10.1016/j.msea.2011.02.062

Cited by 14 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…14b) and knobby fracture mode (Fig. 14c), which suggests partial melting of the grain boundary within the shear bands [27]. This can be ascribed to the high velocity of the projectile; the heat generated in some slip planes does not have enough time to dissipate completely.…”

Section: Fracture Surfacementioning

confidence: 99%

Microstructural Analysis of Ballistic Tests on Welded Armor Steel Joints

Balakrishnan

Balasubramanian

Reddy

2013

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

The deformation and fracture behavior of welded joints made from quenched and tempered steel closely conforming to AISI 4340 were investigated. Due to weld thermal cycles and under matching fillers, the welded armor steel joints showed poor ballistic performance compared with the base metal (BM). The problems encountered in the past were reduced by depositing a soft austenitic stainless-steel buttering layer in between the BM and the hardfaced layer. This method showed enhancement in ballistic performance and good weld integrity. In this investigation, an attempt is made to investigate the microstructure after ballistic testing on the weld metal zone consisting of the hardfaced interlayer. The results reveal the microstructural characteristics before and after ballistic testing of armor steel welds fabricated using the shielded metal arc welding (SMAW) process.

show abstract

Section: Fracture Surfacementioning

confidence: 99%

Microstructural Analysis of Ballistic Tests on Welded Armor Steel Joints

Balakrishnan

Balasubramanian

Reddy

2013

Metallogr. Microstruct. Anal.

View full text Add to dashboard Cite

show abstract

“…ASBs are expected to occur during ballistic impact and can promote development of cracks. 41 Hence, ASB induced cracks are also noticed in the middle region. Finally, more ASBs are identified in the exit region and this indicates that, more heat is evolved in this region as it finally stops the projectile penetration.…”

Section: Sem Examination Along the Penetration Channelmentioning

confidence: 96%

Effect of ceramic particles reinforcement on the ballistic resistance of friction stir processed thick AA6061 surface composite targets

Magarajan¹,

Kumar²

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

In this paper, the effect of ceramic particles (Zirconium, Boron Carbide and Graphene) on the ballistic resistance of Friction Stir Processed (FSPed) thick AA6061 targets had been explored. The Base Metal AA6061 plates of 25 mm thickness were FSPed by reinforcing Zirconium (Zr), Boron Carbide (B4C) and Graphene (G), thus producing FSPed-Zr, FSPed-B4C and FSPed-G surface composite targets. Microhardness test was carried out and the hardness of FSPed-Zr, FSPed-B4C and FSPed-G were found to be 96, 106 and 122 HV respectively. High velocity ballistic experiments were conducted on all the targets against Ø7.62x51 mm Armour Piercing Projectile at an initial velocity of 680 ± 10 m/s. AA6063 backing plates were used to identify the ballistic resistance of the FSPed targets by Depth of Penetration (DOP) method. Consequently, higher microhardness along with frictional characteristics had increased the ballistic resistance of FSPed-G targets by 70.8%. Further, by analyzing the penetration channel, it was noticed that in FSPed-G target, the jacket detachment occurred in the entry region predominantly where the microhardness was the highest compared to other two regions. This phenomenon occurred just after the entry region for FSPed-B4C target and in middle region for FSPed-Zr target. Scanning Electron Microscopy (SEM) images inferred that, FSPed targets have absorbed maximum projectile’s kinetic energy at the entry region itself, resulting in formation of cracks. As a result, middle and exit region experienced less impact. Post ballistic microhardness test showed enhanced microhardness in the entry region of FSPed-G target due to severe work hardening. Hence the ceramic particles deposited by FSP have reduced the kinetic energy of the projectile with FSPed-G target resulting in maximum ballistic resistance.

show abstract

“…ASB are typical of ballistic impacts and may promote the developing of cracks. For instance in [38] ASB appear and produce cracks during a ballistic impact on austenitic steel, potentially resulting in failure before the fracture energy measured in slow tensile test is achieved. As discussed in [39] one of the reasons that make aluminium alloys good candidates for ballistic protection is their good thermal conductivity rendering them less sensitive to ASB.…”

Section: Microstructural Investigationmentioning

confidence: 99%