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J. Mater. Sci. Technol.  2018, Vol. 34 Issue (1): 148-156    DOI: 10.1016/j.jmst.2017.11.013
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Corrosion fatigue behavior of friction stir processed interstitial free steel
Wen Wanga*(), Ruiqi Xua, Yaxin Haoa, Qiang Wanga, Liangliang Yua, Qianying Chea, Jun Caia, Kuaishe Wanga, Zongyi Mab
a School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
b Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Abstract  

In this study, interstitial free (IF) steel plates were subjected to double-sided friction stir processing (FSP). The fine-grained structure with an average grain size of about 12 μm was obtained in the processed zone (PZ) with a thickness of about 2.5 mm. The yield strength (325 MPa) and ultimate tensile strength (451 MPa) of FSP IF steel were significantly higher than those of base material (BM) (192 and 314 MPa), while the elongation (67.5%) almost remained unchanged compared with the BM (66.2%). The average microhardness value of the PZ was about 130 HV, 1.3 times higher than that of the BM. In addition, the FSP IF steel showed a more positive corrosion potential and lower corrosion current density than the BM, exhibiting lower corrosion tendency and corrosion rates in a 3.5 wt% NaCl solution. Furthermore, FSP IF steel exhibited higher fatigue life than the BM both in air and NaCl solution. Corrosion fatigue fracture surfaces of FSP IF steel mainly exhibited a typical transgranular fracture with fatigue striations, while the BM predominantly presented an intergranular fracture. Enhanced corrosion fatigue performance was mainly attributed to the increased resistance of nucleation and growth of fatigue cracks. The corrosion fatigue mechanism was primarily controlled by anodic dissolution under the combined effect of cyclic stress and corrosive solution.

Key words:  Friction stir processing      Interstitial free steel      Fatigue      Corrosion fatigue      Microstructure     
Received:  29 March 2017     
Corresponding Authors:  Wang Wen     E-mail:  wangwen2016@126.com

Cite this article: 

Wen Wang, Ruiqi Xu, Yaxin Hao, Qiang Wang, Liangliang Yu, Qianying Che, Jun Cai, Kuaishe Wang, Zongyi Ma. Corrosion fatigue behavior of friction stir processed interstitial free steel. J. Mater. Sci. Technol., 2018, 34(1): 148-156.

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https://www.jmst.org/EN/10.1016/j.jmst.2017.11.013     OR     https://www.jmst.org/EN/Y2018/V34/I1/148

Fig. 1.  Setup of corrosion fatigue.
Fig. 2.  Cross sectional macroscopic appearance of double-sided FSP IF steel.
Fig. 3.  Microstructure of FSP IF steel in different regions: (a) BM (region 1 in Fig. 2), (b) PZ formed by the first pass FSP (region 2 in Fig. 2), (c) PZ formed by the second pass FSP (region 3 in Fig. 2), (d) fine grains of surface layer in the PZ, (e) dislocation of surface layer in the PZ, (f) TMAZ formed by the first pass FSP (region 4 in Fig. 2), and (g) TMAZ formed by the first pass FSP (region 5 in Fig. 2).
Fig. 4.  Contour map of microhardness distribution of FSP IF steel.
Specimens YS (MPa) UTS (MPa) EL (%)
BM specimen 192 ± 2.8 314 ± 3.7 66.2 ± 0.6
FSP specimen 325 ± 3.5 451 ± 3.5 67.5 ± 0.4
Table 1  Tensile properties of IF steel.
Fig. 5.  Typical fracture surfaces of IF steel after tensile testing: (a) BM specimen, and (b) FSP specimen.
Fig. 6.  Log fatigue life vs log stress range curves of the BM and FSP specimens (a) in air and (b) in 3.5 wt% NaCl solution at a stress ratio of R = 0.1 and 10 Hz loading frequency.
Fig. 7.  Typical fracture surfaces of the BM specimen (on the left side) at ΔS = 220 MPa, Nf = 2.144 × 106 and FSP specimen (on the right side) at ΔS = 420 MPa, Nf = 0.936 × 106 in air: (a) (b) crack initiation zone; (c) (d) crack propagation zone at low amplification, and (e) (f) crack propagation zone at high amplification.
Fig. 8.  Fracture surfaces of the BM specimen in crack propagation zone at ΔS = 220 MPa, Nf = 0.689 × 106 in 3.5 wt% NaCl solution.
Fig. 9.  Fracture surfaces of the FSP specimen in crack propagation zone at ΔS = 370 MPa, Nf = 0.397 × 106 in 3.5 wt% NaCl solution: (a) at low amplification, and (b) at high amplification of region A in (a).
Fig. 10.  Surfaces topography of (a) BM fatigue specimen failed at ΔS = 230 MPa, Nf = 0.411 × 106 and (b) FSP fatigue specimen failed at ΔS = 350 MPa, Nf = 0.513 × 106 in 3.5 wt% NaCl solution.
Fig. 11.  Potentiodynamic polarization curves of the BM and FSP specimens in 3.5 wt% NaCl solution.
Specimen Ecorr (mV) icorr (μA/cm2)
BM specimen -557.59 10.64
FSP specimen -458.22 5.64
Table 2  Corrosion potentials and corrosion current densities of the BM and FSP specimens in 3.5 wt% NaCl solution.
Fig. 12.  Nyquist plots of the BM and FSP specimens in 3.5 wt% NaCl solution.
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