Effect of Rare Earth Addition on Microstructure, Mechanical Property and Nitriding Performance of a Medium Carbon Steel

doi:10.11901/1005.3093.2020.203

Chinese Journal of Materials Research

2021, Vol. 35

Issue (1): 72-80 DOI: 10.11901/1005.3093.2020.203

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Effect of Rare Earth Addition on Microstructure, Mechanical Property and Nitriding Performance of a Medium Carbon Steel

GUI Weimin(

), LIU Yi, ZHANG Xiaotian, HE Liangliang, WANG Ye, WANG Yuandong, HE Erkang, WANG Mengmeng

Shaanxi Fast Gear Co. Ltd. , Xi'an 710077, China

Cite this article:

GUI Weimin, LIU Yi, ZHANG Xiaotian, HE Liangliang, WANG Ye, WANG Yuandong, HE Erkang, WANG Mengmeng. Effect of Rare Earth Addition on Microstructure, Mechanical Property and Nitriding Performance of a Medium Carbon Steel. Chinese Journal of Materials Research, 2021, 35(1): 72-80.

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Abstract

Effect of rare earth microalloying on the microstructure and mechanical property of a medium carbon steel have been investigated, focusing on the influence of rare earth on the formed surface layer after nitriding heat treatment. The results indicate that by adding rare earth elements into the test steel: the original inclusions of long strips of MnS and the coarse Al2O3 convert into the small spherical inclusions of complex rare earth sulfur oxide; the ferrite volume content is reduced ,while more finer lamellar pearlites are formed; the impact energy increases by 126% and the plasticity increases by 10%. After nitriding heat treatment, it is found that the addition of rare earth elements can significantly improve the surface hardness and nitride case depth, as well as improving the vein-like structure of the nitriding layer.

Key words: metallic materials microalloying rare earth mechanical property microstructure

Received: 29 May 2020

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	Weimin GUI
	Yi LIU
	Xiaotian ZHANG
	Liangliang HE
	Ye WANG
	Yuandong WANG
	Erkang HE
	Mengmeng WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.203 OR https://www.cjmr.org/EN/Y2021/V35/I1/72

Table1 Chemical compositions of the test steels (%， mass fraction)

Fig.1 Schematic drawing of the tensile test specimen (a) and the Charpy impact test specimen (b). Dimensions in mm

Fig.2 Schematic diagram of the nitriding heat treatment processes of the specimens

Fig.3 The number of various types of inclusions (a) and the distribution of inclusions size (b)

Fig.4 Optical micrographs of inclusions in the 0RE (a) and 0.03RE (b) tested steels

Fig.5 EPMA mapping of the sulfide inclusions in the tested steel with RE

Fig.6 EPMA mapping of the oxide inclusions in the tested steel with RE

Table 2 Mechanical properties of the 0RE and 0.03RE tested steels

Fig.7 Optical micrographs and SEM micrographs showing the longitudinal-sectional microstructure of the 0RE and 0.03RE tested steels: (a, c) 0RE; (b, d) 0.03RE

Fig.8 Optical micrographs and SEM micrographs showing surface layer microstructure of the 0RE and 0.03RE tested steels after tempering (a,b) and nitriding treatment (c~f):(a), (c) and (e) 0RE; (b), (d) and (f) 0.03RE, respectively

Fig.9 Microhardness profiles in surface layer of the 0RE and 0.03RE tested steels after nitriding treatment

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