ABRASIVE WEAR BEHAVIOR OF LOWER BAINITE DUCTILE IRON IN CORROSION MEDIA

doi:10.11900/0412.1961.2014.00237

Acta Metall Sin

2014, Vol. 50

Issue (11): 1327-1334 DOI: 10.11900/0412.1961.2014.00237

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ABRASIVE WEAR BEHAVIOR OF LOWER BAINITE DUCTILE IRON IN CORROSION MEDIA

SUN Ting, SONG Renbo(

), YANG Fuqiang, LI Yaping, WU Chunjing

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

Cite this article:

SUN Ting, SONG Renbo, YANG Fuqiang, LI Yaping, WU Chunjing. ABRASIVE WEAR BEHAVIOR OF LOWER BAINITE DUCTILE IRON IN CORROSION MEDIA. Acta Metall Sin, 2014, 50(11): 1327-1334.

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Abstract

The corrosion-abrasive wear behavior of lower bainite ductile iron was investigated by corrosion-abrasive wear tests. The main factors of mass loss rate were analyzed. SEM and TEM were used to observe the worn surfaces. The strain-hardening effects beneath the contact surfaces were analyzed by microhardness profiles. The influence of load to corrosion resistance was researched by polarization curves. The results show that the main corrosion wear mechanism was corrosion mass loss and furrow wear. The roughness of worn surface, friction between sample and abrasive, depth of furrow all increased with the test load, which increased the corrosion-abrasive wear rate sharply. Meanwhile, the corrosion micro-cell formed along with the appearance of graphite ribbon and delamination at a higher load, which enhanced the corrosion rate rapidly, and the fracture of delamination resulting from plastic deformation fatigue was another critical factor of the increased mass loss. With the increase of test load, dislocation multiplication and pile-up took place in the retained austenite, which improved the wear resistance of material to some extent. However, the improvement was limited. The average mass loss rate was still increased from 0.16 g/(cm²·h) to 0.42 g/(cm²·h) with the increase of test load; the corrosion current density (i_corr) was enhanced from 0.56 mA/cm² to 5.62 mA/cm² along with the increase of roughness. In addition, the mass loss curves of lower bainite ductile iron were divided into three stages: point contact wear (initial stage), surface contact wear (transition stage) and fatigue wear (stability stage).

Key words: lower bainite ductile iron corrosion-abrasive wear electrochemical behavior galvanic corrosion mass loss rate

Received: 26 June 2014

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	Ting SUN
	Renbo SONG
	Fuqiang YANG
	Yaping LI
	Chunjing WU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00237 OR https://www.ams.org.cn/EN/Y2014/V50/I11/1327

Fig.1 Microstructure of lower bainite ductile iron (A_R—retained austenite, B_L—lower bainite, G—graphite)

Fig.2 Design drawing of corrosion abrasive wear tester

Fig.3 Microstructures of worn surface of lower bainite ductile iron after corrosion abrasive wear with loads of 10 N (a), 50 N (b), 100 N (c), 150 N (d) and 200 N (e)

Fig.4 Microstructures of longitudinal section of lower bainite ductile iron after corrosion abrasive wear with loads of 10 N (a), 50 N (b), 100 N (c), 150 N (d) and 200 N (e) (FD—friction direction)

Fig.5 Microhardness profiles for the specimens after wear test (a) and influence of test loads on microhardness (b) of lower bainite ductile iron

Fig.6 Variations of cumulative mass loss under different test loads (a) and mass loss curve under 200 N (b) of lower bainite with different times

Fig.7 Polarization curves of lower bainite ductile iron with different roughness R_a(E—potential, i—current density)

Table 1 Corrosion potential (E_corr) and corrosion current density (i_corr) of lower bainite ductile iron with different roughness R_a

Fig.8 Fitting curve of corrosion current density and roughness of lower bainite ductile iron

Fig.9 Morphology of high density of dislocation in austenite and low density of dislocation in lower bainite (The inset corresponds to the SAED pattern of the circle area)

Fig.10 Principle of galvanic corrosion formed by delamination and graphite ribbon

Fig.11 Roughness R_a of worn surfaces of lower bainite after corrosion abrasive wear with different loads

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