Kinetics analysis of two-stage austenitization in supermartensitic stainless steel

Frank Nießen; Matteo Villa; John Hald; Marcel A. J. Somers

doi:10.1016/j.matdes.2016.11.076

Kinetics analysis of two-stage austenitization in supermartensitic stainless steel

Frank Nießen, Matteo Villa, John Hald, Marcel A. J. Somers

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Abstract

The martensite-to-austenite transformation in X4CrNiMo16-5-1 supermartensitic stainless steel was followed in-situ during isochronal heating at 2, 6 and 18 K min⁻¹ applying energy-dispersive synchrotron X-ray diffraction at the BESSY II facility. Austenitization occurred in two stages, separated by a temperature region in which the transformation was strongly decelerated. The region of limited transformation was more concise and occurred at higher austenite phase fractions and temperatures for higher heating rates. The two-step kinetics was reproduced by kinetics modeling in DICTRA. The model indicates that the austenitization kinetics is governed by Ni-diffusion and that slow transformation kinetics separating the two stages is caused by soft impingement in the martensite phase. Increasing the lath width in the kinetics model had a similar effect on the austenitization kinetics as increasing the heating-rate.

Original language	English
Journal	Materials & Design
Volume	116
Pages (from-to)	8-15
Number of pages	8
ISSN	0264-1275
DOIs	https://doi.org/10.1016/j.matdes.2016.11.076
Publication status	Published - 2017

Keywords

Supermartensitic stainless steels
Phase transformation kinetics
Interface diffusion
Synchrotron radiation
Kinetics modeling
Reversed austenite

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10.1016/j.matdes.2016.11.076

Niessen Villa Hald Somers 2016Accepted author manuscript, 1.13 MBLicence: Unspecified

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title = "Kinetics analysis of two-stage austenitization in supermartensitic stainless steel",

abstract = "The martensite-to-austenite transformation in X4CrNiMo16-5-1 supermartensitic stainless steel was followed in-situ during isochronal heating at 2, 6 and 18 K min−1 applying energy-dispersive synchrotron X-ray diffraction at the BESSY II facility. Austenitization occurred in two stages, separated by a temperature region in which the transformation was strongly decelerated. The region of limited transformation was more concise and occurred at higher austenite phase fractions and temperatures for higher heating rates. The two-step kinetics was reproduced by kinetics modeling in DICTRA. The model indicates that the austenitization kinetics is governed by Ni-diffusion and that slow transformation kinetics separating the two stages is caused by soft impingement in the martensite phase. Increasing the lath width in the kinetics model had a similar effect on the austenitization kinetics as increasing the heating-rate.",

keywords = "Supermartensitic stainless steels, Phase transformation kinetics, Interface diffusion, Synchrotron radiation, Kinetics modeling, Reversed austenite",

author = "Frank Nie{\ss}en and Matteo Villa and John Hald and Somers, \{Marcel A. J.\}",

year = "2017",

doi = "10.1016/j.matdes.2016.11.076",

language = "English",

volume = "116",

pages = "8--15",

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T1 - Kinetics analysis of two-stage austenitization in supermartensitic stainless steel

AU - Nießen, Frank

AU - Villa, Matteo

AU - Hald, John

AU - Somers, Marcel A. J.

PY - 2017

Y1 - 2017

N2 - The martensite-to-austenite transformation in X4CrNiMo16-5-1 supermartensitic stainless steel was followed in-situ during isochronal heating at 2, 6 and 18 K min−1 applying energy-dispersive synchrotron X-ray diffraction at the BESSY II facility. Austenitization occurred in two stages, separated by a temperature region in which the transformation was strongly decelerated. The region of limited transformation was more concise and occurred at higher austenite phase fractions and temperatures for higher heating rates. The two-step kinetics was reproduced by kinetics modeling in DICTRA. The model indicates that the austenitization kinetics is governed by Ni-diffusion and that slow transformation kinetics separating the two stages is caused by soft impingement in the martensite phase. Increasing the lath width in the kinetics model had a similar effect on the austenitization kinetics as increasing the heating-rate.

AB - The martensite-to-austenite transformation in X4CrNiMo16-5-1 supermartensitic stainless steel was followed in-situ during isochronal heating at 2, 6 and 18 K min−1 applying energy-dispersive synchrotron X-ray diffraction at the BESSY II facility. Austenitization occurred in two stages, separated by a temperature region in which the transformation was strongly decelerated. The region of limited transformation was more concise and occurred at higher austenite phase fractions and temperatures for higher heating rates. The two-step kinetics was reproduced by kinetics modeling in DICTRA. The model indicates that the austenitization kinetics is governed by Ni-diffusion and that slow transformation kinetics separating the two stages is caused by soft impingement in the martensite phase. Increasing the lath width in the kinetics model had a similar effect on the austenitization kinetics as increasing the heating-rate.

KW - Supermartensitic stainless steels

KW - Phase transformation kinetics

KW - Interface diffusion

KW - Synchrotron radiation

KW - Kinetics modeling

KW - Reversed austenite

U2 - 10.1016/j.matdes.2016.11.076

DO - 10.1016/j.matdes.2016.11.076

M3 - Journal article

SN - 0264-1275

VL - 116

SP - 8

EP - 15

JO - Materials & Design

JF - Materials & Design

ER -

Kinetics analysis of two-stage austenitization in supermartensitic stainless steel

Abstract

Keywords

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