Phase diagrams for FE-CR-NI based alloys

Directorate-General For Research And Innovation

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Part 1: Phase diagrams for binary and ternary alloys of FE, CR and NI with C and with SI
Industrial research and development

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• Sciences et techniques

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• Publié par: DIRECTORATE-GENERAL-FOR-RESEARCH-AND-INNOVATION
• Nombre de lectures: 881
• Langue: English
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Commission of the European Communities
physical sciences
PHASE DIAGRAMS FOR
Fe-Cr-Ni BASED ALLOYS
Parti
Phase Diagrams for Binary
and Ternary Alloys of
Fe, Cr and Ni with C and with Si Commission of the European Communities
physical sciences
PHASE DIAGRAMS FOR
Fe-Cr-Ni BASED ALLOYS
Parti
Phase Diagrams for Binary
and Ternary Alloys of
Fe, Cr and Ni with C and with Si
I. ANSARA1), T.G. CHART2), P.Y. CHEVALIER^, K. HACK3),
G. McHUGH"), M.H. RAND*), P.J. SPENCER3)
1) Institut National Polytechnique de Grenoble,
LTPCM - ENSEEG, France
2) National Physical Laboratory, Teddington, UK
3) Rhein-Westf. Technische Hochschule Aachen, FR. Germany
4) Atomic Energy Research Establishment, Harwell, UK
Study Contract
between
The European AtomiaEnergy Community
a nxl
The Scientific Group Thermodata Europe (SGTE)
No. 18/80/SC
Directorate-General for Science, Research and Development
Joint Research Centre - Petten Establishment
1985 EUR 9657/l/EN Published by the
COMMISSION OF THE EUROPEAN COMMUNITIES
Directorate-General
Information Market and Innovation
Bâtiment Jean Monnet
LUXEMBOURG
LEGAL NOTICE
Neither the Commission of the European Communities nor any person acting on behalf
of then is responsible for the use which might be made of the following
information
© ECSC—EEG—EAEC Brussels - Luxembourg, 1985 III
PREFACE
The Joint Research Centre of the Commission of the European Communities,
executes a High Temperature Materials (HTM) programme (at the Petten
Establishment, Holland). This programme contributes toward the development of
HTM's required for advanced future energy technologies (within the Community).
Laboratory research is devoted to in-depth studies of high temperature alloys
and ceramics in corrosive environments typical of fossil fuel conversion and
utilisation processes. Main emphasis is given to the mechanistic understanding
of materials behaviour, under stress in corrosive environments.
The JRC-Petten has requested from Scientific Group Thermodata Europe the
provision of a working compilation of phase diagrams for Cr-Fe-Ni based
alloys:
This working document comprises critically assessed phase diagrams, providing
basic information for research projects involved in the development and use of
high-temperature superalloys and stainless steels. This is envisaged as the
first section of a comprehensive compilation phase diagram data relevant to
the above mentioned materials and covers 9 binary and 7 ternary combinations
of Fe, Cr, Ni, C and Si.
The scope of the work is the critical assessment of experimental phase diagram
data and where these data are either unavailable or uncertain to provide via
thermodynamic calculations, a set of information consistent with available
experimental phase diagram and thermodynamic data.
JRC Petten
Materials Division IV
IMPORTANT NOTE
The information provided in this report has been com­
piled from many sources. No new data assessments have been
made for this compilation.
Although the authors have used their best endeavours
to ensure the accuracy of data provided/no warranty of
accuracy is given and no representation is made that the
data are suitable for application to any particular pur­
pose. CONTENTS
Page
1. INTRODUCTION
1.1. Symbols and definitions 2
1.2. Thermochemical equations used 3
1.3. Gibbs energies of structural
transformations 4
2. BINARY SYSTEMS 5
2.1. The Fe-Cr System
2.2. The Cr-Nim 8
2.3. The Fe-Ni System 12
2.4. The Cr-Sim4
2.5. The Fe-Si System7
2.6. The Ni-Sim 21
2.7. The Cr-C System5
2.8. The Fe-C System 8
2.9. The Ni-Cm 3
3. TERNARY SYSTEMS4
3.1. The Cr-Fe-Ni System
3.2. The Cr-Fe-Sim 5
3.3. The Cr-Ni-Si System 6 3
3.4. The Fe-Ni-Sim 73
3.5. The Cr-Fe-C System 8
3.6. The Cr-Ni-C System 10
3.7. The Fe-Ni-Cm 11
REFERENCES 120 VI
ABSTRACT
Phase diagrams for binary and ternary alloys of Fe, Cr
and Ni with C and with Si have been evaluated from the basis
of published experimental phase diagram and thermodynamic
data. The relevant literature references are provided and
short descriptions of the evaluation procedures used are
given. Diagrams have been drawn to illustrate the evaluated
phase equlibria in the temperature range 750 to 1500 K and
thermochemical data in the form of equations are presented
which permit calculation of the phase equilibria in each
binary and ternary system. Nine binary and seven ternary
systems are included in the evaluations. - 1 -
1. INTRODUCTION
The present working document contains critically eval­
uated phase diagram data for binary and ternary alloys
formed by the metals Fe, Cr and Ni both among themselves
and in combination with C and with Si. The data, which are
presented in the form of diagrams and thermochemical equa­
tions, provide basic information for research projects con­
cerned with the development and use of high-temperature
alloys such as stainless steels and superalloys.
In producing the evaluated diagrams, particular atten­
tion has been given to achieving consistency between exper­
imental phase boundary compositions and thermodynamic meas­
urements for the alloys concerned. Relevant literature re­
ferences are provided, together with short descriptions of
the evaluation procedure used for the individual binary and
ternary systems.
The thermodynamic descriptions produced in the eval­
uation work have been used to calculate relevant phase
equilibria in the temperature range 750 to 1500 K. For all
the binary systems concerned, and where possible for the
ternary systems, a comparison has been made between experi­
mental and calculated phase boundaries. However, isothermal
sections of some ternary systems are based entirely on ther­
mochemical calculations because experimental phase boundary
information is not available.
Attention is drawn to particular features of the phase
equilibria in individual alloy systems and comments on the
likely accuracy of the evaluated phase diagrams are given
when appropriate.
The document comprises evaluations for the nine binary
systems
Cr-Fe Cr-Si Cr-C
Cr-Ni Fe-Si Fe-
Fe-Ni Ni-Si Ni-C - 2 -
and for the seven ternary systems
Cr-Fe-Ni Cr-Fe-C
Cr-Fe-Si Cr-Ni-
Cr-Ni-Si Fe-Ni-C
Fe-Ni-Si
1.1. Symbols and definitions
A list of symbols used in this report, together with
their definitions, is given below
Symbol Definition Units
Τ temperature Κ
mole fraction, as
expressed by the reaction
A B, xA + (1-X)B
χ 1-x
-1
J mol οΓφ standard Gibbs energy
Gi of component i in phase φ
-1
J mol molar Gibbs energy of
Gm
phase φ
-1
J mol molar excess Gibbs energy
EGm of phase φ
m
-1
standard Gibbs energy J mol
of formation of a compound
a
activity
-1«.-1
8.31433 J mol Κ R
Gas Constant
fee
face centred cubic
bec
bodyd cubic
dia
diamond
gr
graphite
E +n
exponent (base 10)
N.B. Units of Joule, J and Kelvin, K, are used throughout
the report.