Wear Resistance of Two Nanostructural Bainitic Steels with Different Amounts of Mn and Ni

doi:10.1007/s40195-016-0424-z

Abstract

Abstract:

Extremely valuable mechanical properties in combination with acceptable wear resistance can make nanostructural bainitic steels to be used extensively in different engineering and tribological applications. However, it is critical to characterize the contributed factors to investigate the wear response of these high-strength materials. This work aims to study the wear behavior of two nanostructural bainitic steels with different amount of austenite stabilizer elements Mn and Ni. For this purpose, wear resistances of the materials were evaluated using the pin-on-disk method. The results indicated that the hardness of the sample is a critical factor affecting the tribological behavior, and the volume fraction and morphology of high-carbon retained austenite are also of considerable importance. It has also been demonstrated that transformation-induced plasticity effect during the wear test and oxide formation at worn surfaces are critical factors.

Key words: Nanostructural, bainitic, steelWearRetained, austeniteTRIP

Saman Ahmadi Miab, Behzad Avishan, Sasan Yazdani. Wear Resistance of Two Nanostructural Bainitic Steels with Different Amounts of Mn and Ni[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(6): 587-594.

Figures/Tables 10

Table 1 Chemical compositions of the two steels (in wt%)

Steel	C	Si	Al	Mn	Cr	Co	Mo	Ni	Fe
Steel 1	0.85	1.68	0.58	2.08	1.27	1.47	0.29	-	Bal.
Steel 2	0.80	1.62	0.60	1.11	1.27	1.48	0.28	2.73	Bal.

Fig. 1 Optical micrographs of steel 1 a and steel 2 b

Table 2 Volume fractions of bainitic ferrite (Vα), austenite (Vγ), austenite films (Vγf), austenite blocks (Vγb), austenite carbon content (Cγ), sub unit thickness (tαb) and hardness

Material	V_α(vol%)	V_γ(vol%)	Vγ_f (vol%)	Vγ_b (vol%)	C_γ(wt%)	t_α_b (nm)	Hardness (HV)
Steel 1	72	28	11	17	1.21	63 ± 3	400 ± 10
Steel 2	65	35	10	25	1.18	71 ± 2	440 ± 10

Fig. 2 TEM micrographs of steel 1 a and steel 2 b

Fig. 3 Micrograph of the microhardness indents within the microstructure of steel 2 after austempering at 300 °C

Fig. 4 Fig. 4Weight loss results a and friction coefficients b of steel 1 and steel 2

Fig. 5 XRD profiles of steel 1 a and steel 2 b before and after wear test

Fig. 6 Hardness profiles for steel 1 and steel 2

Fig. 7 SEM micrographs of the worn surfaces of steel 1 a, b, EDX analysis of the marked region in b, c

Fig. 8 SEM micrographs of the worn surfaces of steel 2 a, b, EDX analysis of the marked region in b, c and the corresponding XRD profile d

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