High-temperature Oxidation Behavior of a High Manganese Austenitic Steel Fe–25Mn–3Cr–3Al–0.3C–0.01N

doi:10.1007/s40195-014-0071-1

Abstract

Abstract:

In this paper, a Fe–Mn–Al–C austenitic steel with certain addition of Cr and N alloy was used as experimental material. By using the SETSYS Evolution synchronous differential thermal analysis apparatus, the scanning electron microscope (SEM), the electron microprobe (EPMA) and the X-ray diffraction (XRD), the high-temperature oxidation behavior microstructure and the phase compositions of this steel in air at 600–1,000 °C for 8 h have been studied. The results show that in the whole oxidation temperature range, there are three distinct stages in the mass gain curves at temperature higher than 800 °C and the oxidation process can be divided into two stages at temperature lower than 800 °C. At the earlier stage the gain rate of the weight oxidized in temperature range of 850 °C to 1,000 °C are extremely lower. The oxidation products having different surface microstructures and phase compositions were produced in oxidation reaction at different temperatures. The phase compositions of oxide scale formed at 1,000 °C are composed of Fe and Mn oxide without Cr. However, protective film of Cr oxide with complicated structure can be formed when the oxidation temperature is lower than 800 °C.

Key words: High manganese austenitic steel, High-temperature oxidation, Microstructure, Phase composition

Xiaoyun Yuan, Yantao Yao, Liqing Chen. High-temperature Oxidation Behavior of a High Manganese Austenitic Steel Fe–25Mn–3Cr–3Al–0.3C–0.01N[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(3): 401-406.

Figures/Tables 9

Table 1 Chemical composition of the high manganese austenitic steel (wt%)

C	Si	Mn	P	S	Cr	Al	N	Fe
0.33	0.27	25.90	0.005	0.008	2.96	2.83	0.01	Bal.

Fig. 1 Weight gain curves of the high manganese austenitic steel: a curves from experimental date for 600–1,000 °C; b fitting curves for 600–800 °C

Table 2 Fitting equations of mass gain (Δm) as a function of oxidation time (t) for the high manganese austenitic steel oxidized at various temperatures

Temperature/ °C	Primary oxidation stage	Slow oxidation stage
600	Δm = 1.96 × 10^-3t + 5.87 × 10^-4 (t = 0–0.68 h)	Δm = 2.42 × 10^-4t + 1.84 × 10^-3 (t = 0.68–8 h)
700	Δm = 4.75 × 10^-3t + 7.22 × 10^-4 (t = 0–2 h)	Δm^1.5 = 5.72 × 10^-4t - 1.41 × 10^-4 (t = 2–8 h)
800	Δm = 1.11 × 10^-2t + 1.29 × 10^-3 (t = 0–2 h)	Δm^3.5 = 2.70 × 10^-6t - 3.53 × 10^-6 (t = 2–8 h)

Fig. 2 SEM photos showing thickness of the oxide scale after oxidized under different temperatures for 8 h: a 600 °C; b 700 °C; c 800 °C; d 950 °C; e 1,000 °C

Fig. 3 Plot of the thickness of oxide scale vs. temperature after 8 h of oxidation

Fig. 4 EPMA mappings of oxidation scale of high manganese austenitic steel oxidized at 800 °C

Fig. 5 EPMA mappings of oxidation scale of high manganese austenitic steel oxidized at 1,000 °C

Fig. 6 SEM images showing outer surfaces of the oxide scale at different temperatures: a, b 600 °C; c 700 °C; d 800 °C; e, f 900 °C; g, h 1,000 °C

Fig. 7 XRD patterns of the high manganese austenitic steel oxidized at 800 °C a, 1,000 °C b

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