Effects of Rare Earth Elements on the Characteristics of Low Temperature Plasma Nitrocarburized Martensitic Stainless Steel

J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (11): 1046-1052.

• Iron and Steel • Previous Articles Next Articles

Effects of Rare Earth Elements on the Characteristics of Low Temperature Plasma Nitrocarburized Martensitic Stainless Steel

R.L. Liu^1,2), Y.J. Qiao¹⁾, M.F. Yan²⁾, Y.D. Fu¹⁾

1) College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2) School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Received:2012-06-20 Revised:2012-09-25 Online:2012-11-09 Published:2012-11-09
Contact: M.F. Yan
Supported by:
National Natural Science Foundation of China (No. 51071061), the Heilongjiang Postdoctoral Subsidies, China (No. LBH-Z10199), the Fundamental Research Funds for the Central Universities, China (No. HEUCFR1129) and the China Postdoctoral Science Foundation (No. 20110491026)

Abstract

Abstract:

Low temperature plasma nitrocarburizing of 17-4PH martensitic stainless steel was conducted at 430 °C with and without rare earth (RE) addition. The microstructure, kinetics, microhardness, wear behavior as well as corrosion resistance of the modified layer were studied by optical microscopy, X-ray diffraction, Vickers microhardness tester, pin-on-disc tribometer and potentiodynamic polarization tests. The results show that the thickness of plasma RE nitrocarburized layer is much thicker than that formed by nitrocarburizing without RE addition. The incorporation of RE does not change the kind of the phases and the nitrocarburized layer consists mainly of nitrogen and carbon expanded martensite α´_N, γ´-Fe₄N and α´-Fe with a trace of CrN phases. The
surface microhardness of plasma nitrocarburized layer can be increased by 100 HV after RE addition. Wear resistance of the specimen can be apparently improved by low temperature plasma nitrocarburizing with and without RE addition and without sacrificing its corrosion resistance. Wear reduction effect of low temperature plasma nitrocarburizing with RE addition is better than that of the conventional one.

Key words: Stainless steel , Low temperature , Plasma nitrocarburizing , Rare earth (RE) , Wear and friction

R.L. Liu, Y.J. Qiao, M.F. Yan, Y.D. Fu. Effects of Rare Earth Elements on the Characteristics of Low Temperature Plasma Nitrocarburized Martensitic Stainless Steel[J]. J. Mater. Sci. Technol., 2012, 28(11): 1046-1052.

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Effects of Rare Earth Elements on the Characteristics of Low Temperature Plasma Nitrocarburized Martensitic Stainless Steel

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