Effect of Surface Nanocrystallization Induced by Supersonic Fine Particles Bombardment on Corrosion Fatigue Behavior of 300M Steel
XIONG Yi1,2(), LUAN Zewei1, MA Yunfei1,3, LI Yong4, ZHA Xiaoqin5
1 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China 2 Provincial and Ministerial Co-constrction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, Henan University of Science and Technology, Luoyang 471023, China 3 AVIC Jonhon Optronic Technology Co. Ltd., Luoyang 471003, China 4 Special Steel Institute, Central Iron and Steel Research Institute, Beijing 100081, China 5 Luoyang Ship Material Research Institute, Luoyang 471000, China
Cite this article:
XIONG Yi, LUAN Zewei, MA Yunfei, LI Yong, ZHA Xiaoqin. Effect of Surface Nanocrystallization Induced by Supersonic Fine Particles Bombardment on Corrosion Fatigue Behavior of 300M Steel. Acta Metall Sin, 2024, 60(5): 627-638.
Although 300M steel is one of the preferred materials for aircraft landing gears and other key load-bearing components in aviation because of its ultra-high strength and excellent ductility, its susceptibility to corrosion fatigue fracture during service in “high temperature, high humidity, and high salt” marine environments is a significant safety hazard. Surface strengthening can effectively improve the corrosion fatigue resistance of materials, thereby improving the reliability of components and extending their service life. Hence, the surface nanocrystallization of 300M ultra-high strength steel via supersonic fine particle bombardment (SFPB) and its effect on the corrosion fatigue behavior of the material in 3.5%NaCl solution was systematically investigated and the surface morphology, microstructure evolution, and residual stress relaxation of 300M steel after corrosion fatigue were characterized. After SFPB, the grain size near the surface was observed to have reduced to the nanoscale, forming gradient nanostructures and high amplitude residual compressive stress. The SFPB treatment effectively improved the corrosion fatigue life of 300M steel at the same loading-stress level. After corrosion fatigue, the grain size of the SFPB-treated 300M steel remained at the nanoscale near the surface, and the increase in the loading stress level caused a significant increase in the dislocation density in the subsurface layer and the number of deformation twins. During the corrosion fatigue loading, the residual compressive stress induced by SFPB in the surface layer of 300M steel relaxed to various degrees, with the degree of residual stress relaxation being significantly higher for higher loading stress levels.
Fund: National Natural Science Foundation of China(U1804146);National Natural Science Foundation of China(52111530068);Foreign Experts Introduction Project of Henan Province(HNGD2020009)
Corresponding Authors:
XIONG Yi, professor, Tel: (0379)64231269, E-mail: xiongy@haust.edu.cn
Fig.1 Dimension of corrosion fatigue (CF) sample (unit: mm)
Fig.2 SEM images of 300M steel without (a) and with (b) supersonic fine particle bombardment (SFPB) treatment before corrosion fatigue (SPD—severe plastic deformation, MPD—minor plastic deformation)
Fig.3 TEM images of SFPB-treated 300M steel before corrosion fatigue (a, b) uppermost surface layers (Inset in Fig.4a shows the selected area electron diffraction (SAED) pattern, and inset in Fig.4b shows the grain size distribution histogram calculated by Nano Measurer software) (c, d) subsurface layers
Fig.4 Nanoindentation hardnesses of 300M steel without and with SFPB treatment before corrosion fatigue
Fig.5 Corrosion fatigue stress-life (S-N) curves of 300M steel without and with SFPB treatment (Nf—cycle to failure, σmax—maximum stress)
Fig.6 Corrosion fatigue fracture SEM images of 300M steel without (a, c, e, g) and with (b, d, f, h) SFPB treatment (σmax = 400 MPa, the life of samples without SFPB N = 6.67 × 105 cyc, the life of samples with SFPB N' = 1.18 × 106 cyc, the same below) (a) overall morphology before SFPB (b) overall morphology after SFPB (c) enlarged view of area I in Fig.6a (d) enlarged view of area I in Fig.6b (e) enlarged view of area II in Fig.6a (f) enlarged view of area II in Fig.6b (Inset shows the locally enlarged view) (g) enlarged view of area III in Fig.6a (h) enlarged view of area III in Fig.6b
Fig.7 Surface morphologies (a, b), roughnesses Sa (c, d), and three-dimensional contour maps (e, f) of 300M steel without (a, c, e) and with (b, d, f) SFPB treatment after corrosion fatigue (σmax = 400 MPa)
Fig.8 XRD spectra of 300M steel without and with SFPB treatment before and after corrosion fatigue
Treatment
ρ
1014 m-2
ε
10-4
Without SFPB, before CF
2.08
6.0
With SFPB, before CF
9.06
55.8
With SFPB, σmax = 400 MPa
8.76
43.6
With SFPB, σmax = 800 MPa
7.81
30.9
Table 1 Dislocation densities and microstrains of 300M steel without and with SFPB before and after corrosion fatigue
Fig.9 TEM images of SFPB-treated 300M steel after corrosion fatigue at different loads (a, b) topmost surface, σmax = 400 MPa (c, d) topmost surface, σmax = 800 MPa (Insets of Figs.9a and c show the SAED patterns, and insets in Figs.9b and d present the grain size distribution histograms calculated by Nano Measurer software) (e) subsurface, σmax = 400 MPa (f) subsurface, σmax = 800 MPa
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