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Title: Formation of delta ferrite in 9 wt.% Cr steel investigated by in-situ X-ray diffraction using synchrotron radiation

Abstract

In situ X-ray diffraction measurements using high energy synchrotron radiation were performed to monitor in real time the formation of delta ferrite in a martensitic 9 wt.% chromium steel under simulated weld thermal cycles. Volume fractions of martensite, austenite and delta ferrite were measured as a function of temperature at a 10 C s-1 heating rate to 1300 C and subsequent cooling to room temperature. At the peak temperature, the delta ferrite concentration rose to a level of 19%, of which 17% transformed back to austenite on subsequent cooling. The final microstructure after this single thermal cycle consisted of newly formed martensite with 4% of retained austenite and 2% of retained delta ferrite.

Authors:
 [1];  [2];  [2];  [3];  [4]
  1. Graz University of Technology
  2. Lawrence Livermore National Laboratory (LLNL)
  3. ORNL
  4. Massachusetts Institute of Technology (MIT)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
992531
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Metallurgical and Materials Transactions A
Additional Journal Information:
Journal Volume: 41A; Journal Issue: 10; Journal ID: ISSN 1073-5623
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; AUSTENITE; CHROMIUM STEELS; FERRITE; HEATING RATE; MARTENSITE; MICROSTRUCTURE; MONITORS; STEELS; SYNCHROTRON RADIATION; X-RAY DIFFRACTION

Citation Formats

Mayr, Peter, Palmer, T. A., Elmer, J. W., Specht, Eliot D, and Allen, S M. Formation of delta ferrite in 9 wt.% Cr steel investigated by in-situ X-ray diffraction using synchrotron radiation. United States: N. p., 2010. Web. doi:10.1007/s11661-010-0371-7.
Mayr, Peter, Palmer, T. A., Elmer, J. W., Specht, Eliot D, & Allen, S M. Formation of delta ferrite in 9 wt.% Cr steel investigated by in-situ X-ray diffraction using synchrotron radiation. United States. https://doi.org/10.1007/s11661-010-0371-7
Mayr, Peter, Palmer, T. A., Elmer, J. W., Specht, Eliot D, and Allen, S M. 2010. "Formation of delta ferrite in 9 wt.% Cr steel investigated by in-situ X-ray diffraction using synchrotron radiation". United States. https://doi.org/10.1007/s11661-010-0371-7.
@article{osti_992531,
title = {Formation of delta ferrite in 9 wt.% Cr steel investigated by in-situ X-ray diffraction using synchrotron radiation},
author = {Mayr, Peter and Palmer, T. A. and Elmer, J. W. and Specht, Eliot D and Allen, S M},
abstractNote = {In situ X-ray diffraction measurements using high energy synchrotron radiation were performed to monitor in real time the formation of delta ferrite in a martensitic 9 wt.% chromium steel under simulated weld thermal cycles. Volume fractions of martensite, austenite and delta ferrite were measured as a function of temperature at a 10 C s-1 heating rate to 1300 C and subsequent cooling to room temperature. At the peak temperature, the delta ferrite concentration rose to a level of 19%, of which 17% transformed back to austenite on subsequent cooling. The final microstructure after this single thermal cycle consisted of newly formed martensite with 4% of retained austenite and 2% of retained delta ferrite.},
doi = {10.1007/s11661-010-0371-7},
url = {https://www.osti.gov/biblio/992531}, journal = {Metallurgical and Materials Transactions A},
issn = {1073-5623},
number = 10,
volume = 41A,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 2010},
month = {Fri Jan 01 00:00:00 EST 2010}
}