Crystallographic Texture Evolution of γ′-Fe4N and Its Influences on Tribological Property of Nitrided Steel

doi:10.1007/s40195-017-0621-4

Abstract

Abstract:

The crystallographic texture of γ′-Fe₄N in compound layer and its influences on the tribological properties of nitrided steel 38CrMoAl are investigated in the study. The preferred orientation of (200)γ′ is produced by low-temperature nitriding in atmosphere with low nitrogen-hydrogen ratio and increases with the nitriding time. The preferred orientation of (220)γ′ appears after 72 h cyclic nitriding. The orientation relationships (0001)_ε//(101)_α′ and [110]_ε//[111]_α′, (111)_γ′//(0001)_ε and [011]γ′//[1$\bar{2}$10]ε, (200)_γ′//(110)_α′ and [011]_γ′//[111]_α′, as well as (1$\bar{1}$03)ε//(220)γ′ and [0100]ε//[1$\bar{1}$0]γ′are established by first-principles method. The misfit of interatomic distance (δ), determining the phase transition resistance, is calculated. Accordingly, two reaction pathways during nitriding, α′→γ′ and α′→ε→γ′, are assumed, which determines the preferred orientations of γ′-Fe₄N. Results of wear tests demonstrate that the specimen with preferred orientation of (200)γ′ exhibits lower frictional coefficient and lower wear rate in comparison with the specimen with (220)γ′ preferred orientation. (111)γ′ texture usually relates to the lower frictional coefficient but higher wear rate due to the main slip system parallel to the sliding plane. Therefore, the (200)γ′ preferred orientation has a positive significance in improving the wear properties of steels.

Key words: Crystallographic orientation, First-principles calculation, Plasma nitriding, Tribological property

Yi-Xue Wang, Mu-Fu Yan, Zhao-Bo Chen, Cheng-Song Zhang, Yuan You. Crystallographic Texture Evolution of γ′-Fe₄N and Its Influences on Tribological Property of Nitrided Steel[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(4): 371-379.

Figures/Tables 11

Fig. 1 XRD patterns of nitrided steel 38CrMoAl, a plasma nitriding at different temperatures with high/low nitrogen supply, b nitriding at 500 °C for different time, c cyclic nitriding between 420 and 500 °C for different time

Fig. 2 a Crystal structures of α-(Fe,M)(1-x)N x with x = 0.2, b crystal structures of α-(Fe,M)(1-x)N x with x = 0.33, c crystal structures of γ′-(Fe,M)4N, d crystal structures of ε-(Fe,M)2-3N

Table 1 Interatomic distances calculated by first-principles calculation

N content	Interatomic distance, D (?)
	α′	γ′			ε
	{110}	{101}	{200}	{111}	{220}	{0001}		{1$\bar{1}$03}
x = 0.2	2.666	2.669	2.663	2.663	3.767	-	-
					2.663
x = 0.33	2.705	2.747	-	-	-	2.736	3.826
		2.705					2.736

Table 2 Misfit of interatomic distance of different crystallographic planes, δ (%)

N content	{110}α′//{200}γ′	{101}α′//{0001}ε	{0001}ε//{111}γ′	{1$\bar{1}$03}ε//{220}γ′
x=0.2	0.11	2.51	-	-
x=0.33	1.55	1.14	2.67	2.67
				1.54

Fig. 3 a Microhardness of steel 38CrMoAl surface plasma nitrided at different temperatures with high/low nitrogen supply, b microhardness of steel 38CrMoAl plasma nitrided at 500 °C for different time and cyclic nitrided between 420 and 500 °C for 72 h

Fig. 4 Frictional coefficients a and wear rates b of steel 38CrMoAl plasma nitrided at different temperatures with high/low nitrogen supply

Fig. 5 Surface morphologies and wear tracks of steel 38CrMoAl plasma nitrided at different temperatures with high/low nitrogen supply, a, c S460(1:8), b, d S560(1:3)

Fig. 6 Frictional coefficients a and wear rates b of steel 38CrMoAl surfaces plasma nitrided at 500 °C for different time

Fig. 7 Morphologies of nitrided surfaces and wear tracks of steel 38CrMoAl plasma nitrided at 500 °C for different time, a and d 24 h, b and e 48 h, c, f 72 h

Fig. 8 Frictional coefficients a and wear rates b of steel 38CrMoAl plasma nitrided at 500 °C for 72 h and cyclic plasma nitrided between 420 and 500 °C for 72 h

Fig. 9 a and c Morphologies of nitrided surface and wear track of steel 38CrMoAl plasma nitrided at 500 °C for 72 h, b, d morphologies of nitrided surface and wear track of steel 38CrMoAl cyclic nitrided between 420 and 500 °C for 72 h

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Crystallographic Texture Evolution of γ′-Fe₄N and Its Influences on Tribological Property of Nitrided Steel

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