1-20 of 73 Search Results for

sigma phase embrittlement

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Image
Published: 01 November 2007
Fig. 13.6 Isothermal transformation diagram of start times for formation of sigma phase and 475 °C embrittlement in ferritic stainless steel More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000005
EISBN: 978-1-62708-312-6
... interstitial contents and minimal residual stresses in PM materials. Only some of the PM ferritic stainless steels from the medium-chromium class may possibly be prone to such behavior. Described as follows are three embrittlement phenomena as observed in wrought ferritic stainless steels: Sigma-phase...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630081
EISBN: 978-1-62708-270-9
...% Cr) 400–500 °C (750–930 °F) exposure Strength increases, ductility decreases Sigma-phase embrittlement Ferritic and austenitic stainless steel 560–980 °C (1050–1800 °F) exposure Toughness decreases Graphitization Carbon and alloy steel Exposure >425 °C (>800 °F) Toughness...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310001
EISBN: 978-1-62708-286-0
... diagram ( Fig. 1 ) shows the composition and temperature regions where ferrite (a), martensite (α′), austenite (γ), and sigma phase (σ) are stable. Fig. 1 The iron chromium phase diagram. Courtesy of Thermo-Calc Software While chromium is the principal ferrite-promoting alloying element...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380235
EISBN: 978-1-62708-456-7
... of embrittlement can lead to brittle fracture. Many forms can occur during thermal treatment or elevatedtemperature service (thermally induced embrittlement). Some of these forms of embrittlement, which affect steels, include blue brittleness, 885 F (475 C) embrittlement, quench-age embrittlement, sigma-phase...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.9781627084567
EISBN: 978-1-62708-456-7
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410579
EISBN: 978-1-62708-265-5
... stainless steel. Light micrograph. Courtesy of S. Yun, Colorado School of Mines The presence of ferrite in austenitic stainless steels may lead to the formation of sigma (σ) phase, which may adversely affect ductility, toughness, and corrosion resistance of austenitic stainless steels ( Ref 23.14...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490329
EISBN: 978-1-62708-340-9
... (<xref ref-type="bibr" rid="t60490329-ref3">Ref 3</xref>) Table 7.1. Potential problems for pressure-vessel shells ( Ref 3 ) Microstructure and phase stability Strength Toughness Hydrogen attack Temper embrittlement (shutdown) Toughness Hydrogen embrittlement Hydrogen embrittlement (shutdown) Sulfide...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310161
EISBN: 978-1-62708-286-0
... initially because solidification segregation causes local enrichment of sigma-promoting elements, such as molybdenum. It can also form from slow cooling of slabs or hot bands. This latter sigma forms at grain boundaries and will cause embrittlement and reduced corrosion resistance, so it must not only...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... for their creep resistance, but they are not immune to reduced rupture life due to overaging. Intermetallic Phase Precipitation Topologically close-packed (tcp) phases, such as sigma, mu, and Laves phases, form at elevated temperatures in austenitic high-temperature alloys. The morphology (shape...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850165
EISBN: 978-1-62708-260-0
... or constituents, such as sigma phase in stainless steel, are anisotropic while the matrix is isotropic, and thus phase discrimination and identification are aided by the use of polarized light. Additional details on the use of polarized light are provided in Chap. 4 . 3-2 Etching For many materials...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220551
EISBN: 978-1-62708-259-4
... of precipitation of embrittling intermetallic phases such as sigma (σ) and chi (χ) that also compromise corrosion resistance in duplex steels. As a rule, the higher the content of alloying elements that stabilize these phases, the faster the precipitation kinetics of the intermetallic phases, as indicated in Fig...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240433
EISBN: 978-1-62708-251-8
... elevations on the other side of the sheet, severely marring the appearance of the part. The sheet thickness remains constant, and the markings are parallel to the rolling direction. There are three types of embrittlement that can occur in ferritic stainless steels. Sigma-Phase Embrittlement When...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
..., on the nickel-base superalloy U-700 creep strength at 815 °C (1500 °F) is shown in Fig. 15.14 , where the pronounced break in the stress-rupture curve at 1000 h is due to sigma-phase embrittlement. However, it has been found that sigma does not have a similar effect on certain other nickel-base alloys...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030380
EISBN: 978-1-62708-282-2
.... A chemical substance that yields hydrogen ions (H+) when dissolved in water; also a substance that dissociates to produce a proton (H+) in any medium, that is, a proton donor. Compare with base. acid embrittlement. A form of hydrogen embrittlement that may be induced in some metals by acid. acid rain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030003
EISBN: 978-1-62708-282-2
... in the neighboring matrix. A continuous network of such Cr-depleted zones can render stainless steel sensitized, or extremely susceptible to sustained intergranular corrosion or stress corrosion cracking. Other phases, such as sigma and chi phases, can also be detrimental, especially in oxidizing environments...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.9781627083126
EISBN: 978-1-62708-312-6
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130001
EISBN: 978-1-62708-284-6
... the performance of the design process of a component. A heat-transfer model, coupling with a phase transformation model, a thermomechanical model, and a thermochemical model, is also considered. The chapter further provides information on the failure aspects of and heat treatment procedures applied to welded...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430027
EISBN: 978-1-62708-253-2
... Abstract This chapter describes the metallurgy, composition, and properties of steels and other alloys. It provides information on the atomic structure of metals, the nature of alloy phases, and the mechanisms involved in phase transformations, including time-temperature effects and the role...