Study on Diffusion Behavior of Nitrogen in Typical Steel by Ionic Nitriding
WANG Ding1, ZHOU Yanwen1, ZHANG Kaice1, SU Zhiwei1, DU Feng1, WU Junsheng1, GUO Cheng2
1 School of Materials Science and Metallurgy, University of Science and Technology Liaoning, Anshan 114031, Liaoning, China 2 Angang Construction Group Co., Ltd., Anshan 114000, Liaoning, China
Abstract: Three typical steels, including M50 die steel, W6 high speed steel and 316L stainless steel, which have significant differences in crystal structure and main alloy compositions, are nitrided by the hot wire enhanced low temperature plasma nitriding technology. After nitriding treatment, the thickness, hardness and wear resistance of nitriding layer of such three typical steels were measured, and the corresponding microstructure and phase constitutions are also observed and analyzed, and thereby the diffusion activation energy of N atoms are calculated. The results show that under the conditions of nitriding temperature of 450 ℃ and nitrogen/hydrogen flow ratio of 1∶3, the hardness and wear resis-tance of these three steels are improved after nitriding treatment for 1 h, 2 h and 4 h, respectively. The formation of ferrite (αN) and iron nitride compound(Fe3N)can be detected in the nitriding layers of M50 die steel with tempered sorbite structure and W6 high speed steel. By contrast, the microstructure of nitriding layer in the 316L stainless steel with austenite structure is identified to be single-phase N-doped austenite (γN), but the affected thickness of three steels are quite different. After 4 h ion nitriding, the thickness of nitriding layer of W6 high speed steel presents a maximum value of 42.2 μm, while the thickness of nitriding layer of M50 die steel reaches 27.2 μm, and the thickness of nitriding layer of 316L stainless steel shows a minimum value of 7.3 μm. The main reason for such difference is the fact that in steel the octahedral gap of body centered cubic (BCC) structure is larger than that of face centered cubic (FCC), and the carbides formed by carbon and alloying elements can promote the nucleation of the ε phase, while the stronger affinity between Cr element and N element at the lattice point further impedes the diffusion of N atoms.
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2022, Vol. 36 
