Friction and Wear Behavior of Niobium Alloyed Medium Chromium Wear-resistant Cast Steel

doi:10.11901/1005.3093.2018.403

Chinese Journal of Materials Research

2019, Vol. 33

Issue (4): 313-320 DOI: 10.11901/1005.3093.2018.403

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Friction and Wear Behavior of Niobium Alloyed Medium Chromium Wear-resistant Cast Steel

Tuo ZHANG,Lvdan TENG,Qiyu ZANG,Yitao YANG(

)

School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

Cite this article:

Tuo ZHANG,Lvdan TENG,Qiyu ZANG,Yitao YANG. Friction and Wear Behavior of Niobium Alloyed Medium Chromium Wear-resistant Cast Steel. Chinese Journal of Materials Research, 2019, 33(4): 313-320.

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Abstract

Tribological behavior of experimental medium chromium wear-resistant cast steels with different niobium addition was investigated by using the MM-W1 pin-on-disc friction and wear tester at room temperature. The microstructure of the worn surface and subsurface were characterized by means of scanning electron microscopy and energy dispersive spectrometer, aiming to reveal the effect of Nb content on the wear behavior and mechanism for the steels. The results show that the addition of 0.2% (mass fraction) Nb can effectively increase the wear resistance of the steel due to the formation of discontinuous rod-like Nb carbides and the effect of grain refinement. An excess addition of Nb can reduce the wear resistance due to the occurrence of coarse mesh carbides and microstructural distortions, which then causes spallation of the worn surface. The 0.2%Nb test steel presented an evolvement of wear mechanism from slight abrasive wear to adhesive wear and oxidation wear.

Key words: metallic materials niobium content medium chromium wear-resistant cast steel carbide wear mechanism

Received: 22 June 2018

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	Tuo ZHANG
	Lvdan TENG
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https://www.cjmr.org/EN/10.11901/1005.3093.2018.403 OR https://www.cjmr.org/EN/Y2019/V33/I4/313

Table 1 Chemical composition of test wear-resistant cast steels (mass fraction, %)

Fig.1 Diagram of pin-on-disk structure

Fig.2 Wear loss of test steel with different Nb content

Fig.3 Worn surface under condition of 200 N and 0.5 m/s, (a) 0Nb, (b) 0.2 %Nb, (c) 0.5%Nb, (d) oxygen element EDS analysis in rectangular area in figure 3a

Table 2 EDS analysis of worn surface elements with different Nb contents (mass fraction, %)

Fig.4 Carbide morphology and grain size of test steel (a) (b) 0Nb, (c) (d) 0.2% Nb, (e) (f) 0.5%Nb

Table 3 Hardness, carbide, grain size of test steel with different Nb content

Fig.5 SEM graphs of cross-section under the worn surface under parameters of 200 N and 0.5 m/s (a) 0Nb, (b) 0.2%Nb, (c) 0.5%Nb, (d) cracked carbide morphology in 0.5% Nb steel

Fig.6 Friction coefficient of 0.2%Nb test steel under different loads (a) friction coefficient curve, (b) change in friction coefficient

Fig.7 Wear morphology under different loads of 0.2%Nb (a) 100 N, (b) 200 N, (c) 300 N, (d) EDS analysis of points A and B in fig.7c

Fig.8 SEM graphs of cross-section under the worn surface of 0.2%Nb steel (a) 100 N, (b) 200 N, (c) 300 N

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