Impact Wear Behavior of a Novel Light-weight Austenitic Wear-resistant Steel

doi:10.11901/1005.3093.2016.396

Chinese Journal of Materials Research

2017, Vol. 31

Issue (7): 537-546 DOI: 10.11901/1005.3093.2016.396

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Impact Wear Behavior of a Novel Light-weight Austenitic Wear-resistant Steel

Shiguang PENG¹, Renbo SONG¹, Changhong CAI¹, Zhongzheng PEI¹, Ke GUO^2,³, Zhonghong WANG³, Jingjun GAO⁴

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 117022, China
3 Angang Group Mining Engineering Corporation, Anshan 114004, China
4 Anshan Iron and Steel Group Mining Company, Anshan 114001, China

Cite this article:

Shiguang PENG, Renbo SONG, Changhong CAI, Zhongzheng PEI, Ke GUO, Zhonghong WANG, Jingjun GAO. Impact Wear Behavior of a Novel Light-weight Austenitic Wear-resistant Steel. Chinese Journal of Materials Research, 2017, 31(7): 537-546.

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Abstract

The wear resistance and wear mechanism of a novel light-weight Fe-24Mn-7Al-1.0C austenitic steel after water quenching (Q) and water quenching-aging (Q-A) treatments were studied by comparing with the Mn13Cr2. The impact wear tests were carried out by using MLD-10 abrasive wear testing tester under low impact energy condition (0.5 J). Results show that the wear resistance of Fe-24Mn-7Al-1.0C steel is 1.14 times higher than that of the water quenched Mn13Cr2. A large number of nano-sized (Fe, Mn)₃AlC κ-carbide precipitates increase the initial hardness, strength and wear resistance of the steel after aging treatment at 550℃ for different time. The wear resistance of Fe-24Mn-7Al-1.0C steel is optimum after 1050℃ quenching and aging 1 h at 550℃, which is 1.40 times higher than that of Mn13Cr2. The worn surfaces of Mn13Cr2 consist of wide, long, uneven grooves and deep peeling pits, of which the formation may be ascribed to the repeated plastic deformation, while worn surfaces of the Fe-24Mn-7Al steel consist of tiny peeling pits and light grooves. Many stacking faults and dislocations in different directions are found on the subsurface of Mn13Cr2. Many Taylor lattices are found at the impact subsurface of Fe-24Mn-7Al steel before aging treatments. After aging treatment for 1 h at 550℃, Taylor lattices and high-density dislocations are found, but no twins and martensitic transformation appear on the worn surface.

Key words: metallic materials light-weight austenitic steel water quenching-aging impact wear κ- carbide Taylor lattices

Received: 11 July 2016

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TG142. 25

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	Shiguang PENG
	Renbo SONG
	Changhong CAI
	Zhongzheng PEI
	Ke GUO
	Zhonghong WANG
	Jingjun GAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.396 OR https://www.cjmr.org/EN/Y2017/V31/I7/537

Table 1 Chemical compositions of the test steels (%, mass fraction)

Fig.1 Schematic diagram of the impact tester

Fig.2 True stress-strain curves (a) and corresponding dσ/dε curves (b) of Mn13Cr2 and Fe-24Mn-7Al-1.0C

Table 2 Mechanical properties of the test materials after heat treatments under different condition

Fig.3 Microstructures of (a) Mn13Cr2 and (b) Fe-24Mn-7Al-1.0C (Q), (c) SEM image of Fe-24Mn-7Al-1.0C (Q-A /3 h), (d) EDS results of ‘A’ in Fig.c

Fig.4 (a,c,e) Morphologies and (b,d,f) selected area diffraction patterns of matrix of Fe-24Mn-7Al-1.0C

Fig.5 XRD spectra of Fe-24Mn-7Al-1.0C after different heat treatments

Fig.6 (a) wear resistance and (b) relative wear resistance of Mn13Cr2 steel and Fe-24Mn-7Al-1.0C steel (Q)

Fig.7 SEM morphologies of worn surfaces of (a) Mn13Cr2 (Q) and Fe-24Mn-7Al-1.0C with different process treatments of (b) Q;(c) Q-A /1 h; (d) Q-A /2 h; (e) Q-A /3 h; (f) Q-A/4 h

Fig.8 TEM morphologies of worn sub-surfaces of (a) Mn13Cr2 (Q ) and Fe-24Mn-7Al-1.0C with different process treatments of (b) Q; (c) Q-A /1 h; (d) Q-A/2 h; (e) Q-A /3 h; (f) Q-A/4 h

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