ASTM G209-14(2018)

Standard Practice for Detecting mu-phase in Wrought Nickel-Rich, Chromium, Molybdenum-Bearing Alloys

SIGNIFICANCE AND USE
4.1 These test methods describe laboratory tests to determine the presence of mu-phase in Wrought Nickel-Rich, Chromium, and Molybdenum-Bearing Alloys through comparison of microstructure observed for etched metallographic specimens to a glossary of photomicrographs displaying the presence and absence of mu-phase in the microstructure. The presence of mu-phase in the microstructure may significantly reduce the corrosion resistance, strength, toughness and ductility of Wrought Nickel-Rich, Chromium, and Molybdenum-Bearing Alloys.
SCOPE
1.1 This practice incorporates etching and metallographic examination of Wrought Nickel-Rich, Chromium, Molybdenum-Bearing Alloys such as, but not limited to, UNS N06686 and UNS N10276.  
1.2 Microstructures have a strong influence on properties and successful application of metals and alloys. The presence of mu-phase in the microstructure may significantly reduce the corrosion resistance of Wrought Nickel-Rich, Chromium, and Molybdenum-Bearing Alloys.  
1.3 This practice may be used to determine the presence of mu-phase in Wrought Nickel-Rich, Chromium, and Molybdenum-Bearing Alloys through comparison of microstructure observed for etched metallographic specimens to a glossary of photomicrographs displaying the presence and absence of mu-phase in the microstructure.  
1.4 The values stated in SI units are to be regarded as the standard. Other units are given in parentheses for information only.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 30-Sep-2018
• ICS: 77.040.30 - Chemical analysis of metals
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.05 - Laboratory Corrosion Tests

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: G209 − 14 (Reapproved 2018)
Standard Practice for
Detecting mu-phase in Wrought Nickel-Rich, Chromium,
1
Molybdenum-Bearing Alloys
This standard is issued under the fixed designation G209; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2
1.1 This practice incorporates etching and metallographic 2.1 ASTM Standards:
examination of Wrought Nickel-Rich, Chromium, D1193Specification for Reagent Water
Molybdenum-BearingAlloys such as, but not limited to, UNS E3Guide for Preparation of Metallographic Specimens
N06686 and UNS N10276. E7Terminology Relating to Metallography
E1245Practice for Determining the Inclusion or Second-
1.2 Microstructures have a strong influence on properties
Phase Constituent Content of Metals byAutomatic Image
and successful application of metals and alloys. The presence
Analysis
ofmu-phaseinthemicrostructuremaysignificantlyreducethe
E1268Practice for Assessing the Degree of Banding or
corrosion resistance of Wrought Nickel-Rich, Chromium, and
Orientation of Microstructures
Molybdenum-Bearing Alloys.
G193Terminology and Acronyms Relating to Corrosion
1.3 This practice may be used to determine the presence of
mu-phase in Wrought Nickel-Rich, Chromium, and 3. Terminology
Molybdenum-Bearing Alloys through comparison of micro-
3.1 Definitions:
structure observed for etched metallographic specimens to a
3.1.1 The terminology used herein, if not specifically de-
glossary of photomicrographs displaying the presence and
fined otherwise, shall be in accordance with Terminology
absence of mu-phase in the microstructure.
G193. Definitions provided herein and not given in Terminol-
ogy G193 are limited only to this practice.
1.4 The values stated in SI units are to be regarded as the
standard. Other units are given in parentheses for information 3.1.2 For metallographic definitions used in this practice,
only. refer to Terminology E7.
3.1.3 For evaluation of inclusions, secondary phases and
1.5 This standard does not purport to address all of the
banding, if desired, refer to Practices E1245 and E1268.
safety concerns, if any, associated with its use. It is the
3.2 Definitions of Terms Specific to This Standard:
responsibility of the user of this standard to establish appro-
3.2.1 mu-phase (µ), n—rhombohedral phase which may
priate safety, health, and environmental practices and deter-
occur in Nickel-Rich, Chromium, Molybdenum-Bearing Al-
mine the applicability of regulatory limitations prior to use.
loysandmayoccurascoarse,irregularplatelets,whichformat
1.6 This international standard was developed in accor-
high temperature.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Significance and Use
Development of International Standards, Guides and Recom-
4.1 These test methods describe laboratory tests to deter-
mendations issued by the World Trade Organization Technical
mine the presence of mu-phase in Wrought Nickel-Rich,
Barriers to Trade (TBT) Committee.
Chromium, and Molybdenum-Bearing Alloys through com-
parison of microstructure observed for etched metallographic
1
This practice is under the jurisdiction ofASTM Committee G01 on Corrosion
of Metals and is the direct responsibility of Subcommittee G01.05 on Laboratory
2
Corrosion Tests. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2018. Published November 2018. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2012. Last previous edition approved in 2014 as G209–14. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/G0209-14R18. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G209 − 14 (2018)
specimens to a glossary of photomicrographs displaying the 5.2 Coarse Grinding—Use a 120 grit silicon carbide (SiC)
presence and absence of mu-phase in the microstructure. The wet-belt or disk grinder and light contact pressure to obtain a
presence of mu-phase in the microstructure may significantly plane surface free from deep grooves. In addition to producing
reduce the corrosion resistance, strength, toughness and duc- a flat surface, this procedure removes burred edges or other
tility of Wrought Nickel-Rich, Chromium, and Molybdenum- mechanical damage which may have occurred during section-
Bearing Alloys. ing.
5.3 Mounting—Toensureflatness,andfacilitate
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: G209 − 14 G209 − 14 (Reapproved 2018)
Standard Practice for
Detecting mu-phase in Wrought Nickel-Rich, Chromium,
1
Molybdenum-Bearing Alloys
This standard is issued under the fixed designation G209; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice incorporates etching and metallographic examination of Wrought Nickel-Rich, Chromium, Molybdenum-
Bearing Alloys such as, but not limited to, UNS N06686 and UNS N10276.
1.2 Microstructures have a strong influence on properties and successful application of metals and alloys. The presence of
mu-phase in the microstructure may significantly reduce the corrosion resistance of Wrought Nickel-Rich, Chromium, and
Molybdenum-Bearing Alloys.
1.3 This practice may be used to determine the presence of mu-phase in Wrought Nickel-Rich, Chromium, and Molybdenum-
Bearing Alloys through comparison of microstructure observed for etched metallographic specimens to a glossary of
photomicrographs displaying the presence and absence of mu-phase in the microstructure.
1.4 The values stated in SI units are to be regarded as the standard. Other units are given in parentheses for information only.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
E3 Guide for Preparation of Metallographic Specimens
E7 Terminology Relating to Metallography
E1245 Practice for Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic Image Analysis
E1268 Practice for Assessing the Degree of Banding or Orientation of Microstructures
G193 Terminology and Acronyms Relating to Corrosion
3. Terminology
3.1 Definitions:
3.1.1 The terminology used herein, if not specifically defined otherwise, shall be in accordance with Terminology G193.
Definitions provided herein and not given in Terminology G193 are limited only to this practice.
3.1.2 For metallographic definitions used in this practice, refer to Terminology E7.
3.1.3 For evaluation of inclusions, secondary phases and banding, if desired, refer to Practices E1245 and E1268.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 mu-phase (μ), n—rhombohedral phase which may occur in Nickel-Rich, Chromium, Molybdenum-Bearing Alloys and
may occur as coarse, irregular platelets, which form at high temperature.
1
This test method practice is under the jurisdiction of ASTM Committee G01 on Corrosion of Metals and is the direct responsibility of Subcommittee G01.05 on
Laboratory Corrosion Tests.
Current edition approved Nov. 1, 2014Oct. 1, 2018. Published November 2014November 2018. Originally approved in 2012. Last previous edition approved in 20132014
as G209G209 – 14.–13. DOI: 10.1520/G0209-14.10.1520/G0209-14R18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G209 − 14 (2018)
4. Significance and Use
4.1 These test methods describe laboratory tests to determine the presence of mu-phase in Wrought Nickel-Rich, Chromium,
and Molybdenum-Bearing Alloys through comparison of microstructure observed for etched metallographic specimens to a
glossary of photomicrographs displaying the presence and absence of mu-phase in the microstructure. The presence of mu-phase
in the microstructure may significantly reduce the corrosion resistance, strength, toughness and ductility of Wrought Nickel-Rich,
Chromium, and
...