Thermal Stability of Nitrogen Expanded Austenite Formed by Plasma Nitriding on AISI304 Austenitic Stainless Steels

Wang, Liang; Li, Yang; Wang, Yi Zuo

doi:10.4028/www.scientific.net/KEM.373-374.308

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Thermal Stability of Nitrogen Expanded Austenite Formed by Plasma Nitriding on AISI304 Austenitic Stainless Steels
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Home Key Engineering Materials Surface EngineeringThermal Stability of Nitrogen Expanded Austenite...

Thermal Stability of Nitrogen Expanded Austenite Formed by Plasma Nitriding on AISI304 Austenitic Stainless Steels

Abstract:

The effect of thermal annealing temperature on the microstructure and phase composition of nitrided layer formed on AISI 304 stainless steel by plasma nitriding were investigated. The phase composition and structure of the nitrided have been analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD analysis of nitrided samples at 420oC showed the presence of γN phase in the nitrided layer. The temperature at which the nitrogen expanded austenite started to decompose was about 450oC. Above this critical temperature the γN phase transformed into a mixture of CrN and α-phase. The surface hardness of nitrided layer also slightly changed with annealing temperature.

Info:

Periodical:

Key Engineering Materials (Volumes 373-374)

Main Theme:

Surface Engineering

Edited by:

M.K. Lei, X.P. Zhu, K.W. Xu and B.S. Xu

Pages:

308-311

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.373-374.308

Citation:

L. Wang et al., "Thermal Stability of Nitrogen Expanded Austenite Formed by Plasma Nitriding on AISI304 Austenitic Stainless Steels", Key Engineering Materials, Vols. 373-374, pp. 308-311, 2008

Online since:

March 2008

Authors:

Liang Wang, Yang Li, Yi Zuo Wang

Keywords:

Expanded Austenite, Plasma Nitriding, Thermal Stability

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Abstract: Phase change memory materials of Ge-Sb-Te system [(GeTe)m(Sb2Te3)n (m : n = 1:1; 1:2; 2:1)] were studied during thermal cycling by differential scanning calorimetry, and thermal properties were determined. Reproducible endothermic peak in the range of 390-415°C was revealed in Ge2Sb2Te5, GeSb2Te4, GeSb4Te7, which may possibly influence on the kinetics and endurance of data reading processes in phase-change memory devices. The nature of this endothermic peak is discussed. It was shown that additional annealing of synthesized Ge2Sb2Te5 increase stability of structure and thermal properties of the material.

Effects of Annealing on Microstructure and Martensitic Transition of Ni-Mn-Co-In Ferromagnetic Shape Memory Alloys

Authors: Katarzyna Bałdys, Grzegorz Dercz, Łukasz Madej

Abstract: The ferromagnetic shape memory alloys (FSMA) are relatively the brand new smart materials group. The most interesting issue connected with FSMA is magnetic shape memory, which gives a possibility to achieve relatively high strain (over 8%) caused by magnetic field. In this paper the effect of annealing on the microstructure and martensitic transition on Ni-Mn-Co-In ferromagnetic shape memory alloy has been studied. The alloy was prepared by melting of 99,98% pure Ni, 99,98% pure Mn, 99,98% pure Co, 99,99% pure In. The chemical composition, its homogeneity and the alloy microstructure were characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phase composition was also studied by X-ray analysis. The transformation course and characteristic temperatures were determined by the use of differential scanning calorimetry (DSC) and magnetic balance techniques. The results show that Tc of the annealed sample was found to decrease with increasing the annealing temperature. The Ms and Af increases with increasing annealing temperatures and showed best results in 1173K. The studied alloy exhibits a martensitic transformation from a L21 austenite to a martensite phase with a 7-layer (14M) and 5-layer (10M) modulated structure. The lattice constants of the L21 (a0) structure determined by TEM and X-ray analysis in this alloy were a0=0,4866. The TEM observation exhibit that the studied alloy in initial state has bigger accumulations of 10M and 14M structures as opposed from the annealed state.

171

Multilayer Synthesized CuInSi Composite Film by Magnetron Sputtering

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2770

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1171

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