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Temperature Dependent Phase Transformation Kinetics of Reverted Austenite during Tempering in 13Cr Supermartensitic Stainless Steel

1
School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, China
2
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Ma’anshan 243002, China
3
Analytical Instrumentation Center, Anhui University of Technology, Ma’anshan 243002, China
4
School of Mechanical Engineering, Anhui University of Technology, Ma’anshan 243002, China
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(11), 1203; https://doi.org/10.3390/met9111203
Received: 16 September 2019 / Revised: 23 October 2019 / Accepted: 1 November 2019 / Published: 8 November 2019
(This article belongs to the Special Issue Manufacturing and Application of Stainless Steels)
The formation and growth kinetics of the reverted austenite during tempering in 13Cr supermartensitic stainless steel were investigated by a combination X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) in a scanning electron microscope (SEM). The reverted austenite precipitated at the martensite blocks, sub-blocks, laths and grain boundaries. The growth kinetics was established by Johnson-Mehl-Avrami (JAM) kinetics equation according to the volume fraction of the equilibrium reverted austenite at room temperature. The Avrami exponent value is 0.5, and the activation energy was estimated to be 369 kJ/mol, the kinetic model indicates that the mechanism of reverted austenite is diffusion-controlled and the growth of reverted austenite closely relies on the diffusion of the nickel (Ni) element. The experimental measured orientations of the reverted austenite are in good agreement with the theoretical ones, implying that the reverted austenite has the same orientation with the surrounding martensite, which meets the Kurdjumov–Sachs (K-S) orientation relationship. The orientation relationships minimize the strain energy of the phase transformation by reducing the crystallographic mismatch between phases. View Full-Text
Keywords: supermartensitic stainless steel; reverted austenite; phase transformation; kinetics model; electron backscattered diffraction supermartensitic stainless steel; reverted austenite; phase transformation; kinetics model; electron backscattered diffraction
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Zhang, Y.; Yin, Y.; Li, D.; Ma, P.; Liu, Q.; Yuan, X.; Li, S. Temperature Dependent Phase Transformation Kinetics of Reverted Austenite during Tempering in 13Cr Supermartensitic Stainless Steel. Metals 2019, 9, 1203.

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