Comparing the Fatigue and Corrosion Behavior of Nanograin and Coarse-Grain IF Steels

doi:10.1007/s40195-014-0196-2

Abstract

Abstract:

In the present work, a nanograin layer of about 150 µm thick was formed on the surface of an interstitial-free (IF) steel via friction stir processing. Then, the fatigue and corrosion behaviors of IF steel with nanograin layer were compared with that of coarse-structure counterpart. More than threefold increase in the hardness was observed due to the formation of nanograin layer. The size of nanograins in the stir zone was within 30-150 nm. This resulted in 50% increase in the fatigue strength of nanostructured specimen. Furthermore, the fracture surfaces were characterized using field emission scanning electron microscopy and scanning electron microscopy. As for the fatigue behavior of nanograin IF steel, the fracture surface was characterized by the formation of nanospacing striations and nanodimples. Besides, the nanograin structure pronounced the passivity and exhibited higher corrosion resistance.

Key words: Nanograin, Interstitial-free (IF) steel, Fatigue, Friction stir processing (FSP), Corrosion

A. Chabok, K. Dehghani, M. Ahmadi Jazani. Comparing the Fatigue and Corrosion Behavior of Nanograin and Coarse-Grain IF Steels[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(3): 295-301.

Figures/Tables 10

Fig. 1 Schematic and dimensions of the fatigue test specimens

Fig. 2 a SEM taken from cross section of friction stir processed zone, b FESEM confirming the nanograins in stir zone/top surface

Fig. 3 Stress-life diagrams of as-received and FSPed IF steel

Fig. 4 Fatigue striations formed in nanostructured sample a, coarse-grain sample b

Fig. 5 The dimples formed in nanostructured sample a, coarse-grain sample b

Fig. 6 potentiodynamic polarization curves for the coarse-grain and nano grain IF steel in different solutions: a 3.5 wt% NaCl, b 0.1 mol/L H2SO4, c 2.5 wt% NaCl + 0.05 mol/L H2SO4, d 3.5 wt% NaCl + 0.1 mol/L H2SO4

Table 1 Corrosion parameters of nanograin and coarse-grain IF steels in different corrosive media

Solution	E _corr (V)		i _corr (A/cm²)
Solution	CG IF steel	NG IF steel	CG IF steel	NG IF steel
3.5 wt% NaCl	-0.59	-0.28	5.34 × 10^-6	1.69 × 10^-7
0.1 mol H₂SO₄	-0.67	-0.61	6.43 × 10^-5	2.55 × 10^-5
2.5 wt% NaCl + 0.05 mol/L H₂SO₄	-0.48	-0.26	5.78 × 10^-6	2.88 × 10^-8
3.5 wt% NaCl + 0.1 mol/L H₂SO₄	-0.32	-0.18	5.72 × 10^-7	2.22 × 10^-8

Fig. 7 SEMs of nano grain a coarse-grain b IF steels exposed to 3.5 wt% NaCl medium

Fig. 8 SEMs of coarse-grain a nanograin b IF steels exposed to 0.1 mol/L H2SO4 medium

Fig. 9 SEMs of nanograin a coarse-grain b IF steels exposed to 3.5 wt% NaCl + 0.1 mol/L H2SO4 medium

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