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Acta Metall Sin  2026, Vol. 62 Issue (8): 1405-1416    DOI: 10.11900/0412.1961.2025.00206
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Dynamic Mechanical Response and Spallation Behavior of 60 Steel Under Shock Loading
YANG Kun1, GUO Qingwei1, LI Chao2, ZHANG Gaolong1,3, ZHAO Yuhong4, HOU Hua1()
1 School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
2 School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
3 Shanxi Shenzhou Aerospace Technology Co. Ltd. , Jinzhong 030800, China
4 School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Cite this article: 

YANG Kun, GUO Qingwei, LI Chao, ZHANG Gaolong, ZHAO Yuhong, HOU Hua. Dynamic Mechanical Response and Spallation Behavior of 60 Steel Under Shock Loading. Acta Metall Sin, 2026, 62(8): 1405-1416.

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Abstract  

Owing to its favorable mechanical properties derived from a ferrite-pearlite dual-phase microstructure, 60 steel is widely used in load-bearing components such as bearings and transmission gears, as well as in impact-resistant structures in vehicles and ships, underscoring its potential for dynamic engineering applications. In this study, plate-impact experiments were performed using a single-stage gas gun. The shock-induced microstructural response of 60 steel was examined using SEM and EBSD. Free-surface velocity profiles indicate that spall strength initially increases with peak stress and subsequently approaches saturation. Damage morphology reveals that brittle fracture is the dominant failure mechanism, characterized by the nucleation and propagation of cleavage cracks. At higher peak stresses, ductile damage becomes increasingly evident through the nucleation, growth, and coalescence of microvoids. Grain boundaries, cementite lamellae, and ferrite-cementite interfaces serve as preferential damage-nucleation sites. Within pearlite colonies, microcracks tend to propagate along directions forming larger angles with the cementite lamellae. EBSD analysis further confirms that grain orientation governs cleavage-crack propagation, with microcracks preferentially advancing along the {001} crystallographic planes.

Key words:  shock loading      spall strength      microstructure      cleavage crack     
Received:  18 July 2025     
ZTFLH:  TG142.1  
Fund: Key Project of National Natural Science Foundation Joint Fund(U23A20628);Fundamental Re-search Program of Shanxi Province(202403021222207)
Corresponding Authors:  HOU Hua, professor, Tel: 13934153099, E-mail: houhua@nuc.edu.cn

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2025.00206     OR     https://www.ams.org.cn/EN/Y2026/V62/I8/1405

Fig.1  Schematic setup of plate impact experiments (1: gun barrel; 2: polycarbonate sabot; 3: flyer plate; 4: recess for release waves; 5: O-rings; 6:sample; 7: momentum trap rings; 8: optical fibers and detectors for the optical beam block system; 9: sample holder; 10: mirror; 11: optical fiber connected to the laser Doppler velocimeter probe; 12: soft recovery; 13: vacuum/sample chamber)
No.dfdsuf
mmmmkm·s-1
Shot 11.4922.9950.205
Shot 21.5023.0080.307
Shot 31.4932.9920.534
Shot 41.5093.0070.645
Table 1  Parameters of plate impact experiments
Fig.2  Microstructural characterizations of the initial material by SEM and EBSD
Fig.3  Schematic of position-time (X-t) diagram (a) and corresponding free surface velocity (ufs) history showing the principle for wave propagation and spallation (b) (Se—elastic shock; Sp—plastic shock; Rf and Rs—release fans initialed from the free surfaces of the flyer plate and the sample, respectively; OX1 and OX2 correspond to the thicknesses of the flyer and the sample, respectively; labels O-G represent waves propagation and spallation stages)
Fig.4  Free surface velocity history curves of plate impact experiments with different impact velocities
No.σHELσHσspε˙
GPaGPaGPa105 s-1
Shot 12.253.671.570.465
Shot 22.255.621.990.556
Shot 32.2910.261.960.566
Shot 42.4512.682.220.587
Table 2  Mechanical properties of 60 steel under different peak stresses
Fig.5  Spall strength as a function of peak stress for Q235 steel[15,22] and 60 steel
Fig.6  SEM images of the postmortem sample for Shot 1 (a) and magnified views of the regions delimited by the rectangles in Fig.5a (b-d) (LD—loading direction. Arrows point to microvoids, manifested as damage in Fig.5a and located at pearlitic cementite-ferrite interfaces in Fig.5c)
Fig.7  SEM images of the postmortem sample for Shot 1 (C1-C4 correspond to cracks 1-4, respectively)
Fig.8  Distributions of the angle between microcrack propagation direction and cementite lamellae direction
Fig.9  SEM image and EBSD characterizations of the postmortem sample for Shot 2 (C5-C8 correspond to cracks 5-8, respectively)
Fig.10  Magnified SEM images (a, b) and IPF maps (c, d) of cracks C6-C8 in Fig.9 (The black dashed lines indicate the paths of C6-C8, respectively, while the two sets of black solid lines represent the {001} traces of the grains containing these cracks) (a, c) crack C6 (b, d) cracks C7 and C8
Fig.11  SEM and EBSD characterizations of the postmortem sample for Shot 3
Fig.12  SEM fractographs of postmortem sample for Shot 4 at different magnifications (a-d) (Fig.12d is the magnified view of the region delimited by the rectangle in Fig.12c. Arrows in Figs.12a and d indicate dimple features and river patterns, respectively; black circles in Fig.12b highlight the characteristic fracture morphologies of pearlite)
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