High-Temperature Oxidation Behavior and Related Mechanism of RuT400 Vermicular Graphite Iron

doi:10.1007/s40195-021-01343-w

Abstract

Abstract:

The vermicular graphite iron is an important material with excellent combination properties for cylinder heads of diesel engines, and the high-temperature oxidation is a crucial problem during service of the component. In this study, the oxidation experiment of RuT400 vermicular graphite iron was performed at 500 °C, and the oxidation time was chosen as 100 h, 200 h, 300 h, 400 h, and 500 h, respectively. Meanwhile, the corresponding microstructure evolution, oxidation kinetics, and oxidation mechanism were discussed. It is found that oxidation pores and oxide layer often appear at the vermicular graphite on the specimen surface; the vermicular graphite plays the role of oxidation channel, and it tends to diffuse along the adjacent pearlite and then connect with each other to form oxidation bridges as the oxidation time prolongs. A linear relationship between oxidation weight gain and the thickness of the oxide layer was established and verified well. These results will give a more comprehensive understanding on the oxidation mechanism of vermicular graphite iron and provide certain guidance for design and preparation of anti-oxidation cast irons.

Key words: Vermicular graphite iron, High-temperature oxidation, Microstructure evolution, Oxidation mechanism

Yu Chen, Jian-chao Pang, Shou-xin Li, Zhe-feng Zhang. High-Temperature Oxidation Behavior and Related Mechanism of RuT400 Vermicular Graphite Iron[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(7): 1117-1130.

Figures/Tables 16

Table 1 Chemical composition (wt %) of RuT400

Element	CE	C	Si	Mn	P	S	Mg	Fe
Content	4.16	3.55	2.19	0.17	0.02	0.007	0.016	Balance

Fig. 1 Process of oxidation experiment

Fig. 2 Original microstructures of RuT400: a unetched and b etched, OM; c and d the high-magnification of b, SEM

Fig. 3 OM microstructure analysis: a original and b oxidation for 500 h

Fig. 4 Proportion of microstructures before and after oxidation for 500 h

Fig. 5 SEM microstructure analysis: a original; b 100 h; c 200 h; d 300 h; e 400 h; f 500 h oxidation.

Fig. 6 Morphologies of the oxide layer at different magnifications after oxidation for 500 h at 500 °C

Fig. 7 Oxide layer images (SEM) and the elemental maps of the oxide layer

Fig. 8 Diffusion zones of oxidation after different oxidation time: a 100 h; b 200 h

Fig. 9 Thickness of the oxide layer at different oxidation time at 500 °C: a 100 h; b 200 h; c 300 h; d 400 h; e 500 h

Fig. 10 Curves of the thickness of the oxide layer varied with oxidation time: a 4#; b 5#; c 6#; d 4#, 5#, 6#

Fig. 11 Vermicular graphite before and after oxidation: a original; b, c, d oxidation for 500 h

Fig. 12 Oxidation weight gain curves: a 1#; b 2#; c 3#; d 1#, 2#, 3#

Fig. 13 Oxidation rate curves: a 1#; b 2#; c 3#; d 1#, 2#, 3#

Fig. 14 Oxidation weight gain and thickness of the oxide layer

Fig. 15 High-temperature oxidation schematic diagram of VGI

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