sigma phase formation and embrittlement of cast iron

Sigma Phase Formation and Embrittlement of Cast Iron

Sigma Phase Formation and Embrittlement of Cast Iron-Chromium-Nickel (Fe-Cr-Ni) Alloys.HK alloy is a member of the heat resistant cast alloy family (H-Series) steels.They are widely used in the petrochemical industry for components requiring enhanced high temperature properties. results for this questionFeedbackSigma Phase Formation and Embrittlement of Cast Iron Sigma () phase (iron-chromium compound) can develop in austenitic stainless steels as seen in the Figures 4 to 9.It is hard-brittle intermetallic phase.For this reason it has a direct effect on the mechanical property of the metal.It can form when service temperature is within 565-952°C (1050-1700°F). results for this questionHow does the sigma phase affect structural stability?How does the sigma phase affect structural stability?Structural Stability.Sigma phase embrittlement refers to the formation of a precipitate in the steel microstructure over a long period of time within this particular temperature range.The effect of the formation of this phase is to make the steel extremely brittle and failure can occur because of brittle fracture.Stainless Steel - High Temperature Resistance

results for this questionWhat happens when stainless steel is embrittled at high temperature?What happens when stainless steel is embrittled at high temperature?Soaking at higher temperatures for several hours should restore normal ductility.Sigma-phase embrittlement.Prolonged service at 560 to 980 °C (1050 to 1800 °F) can cause formation of the hard,brittle sigma phase in both ferritic and austenitic stainless steels and similar alloys.Embrittlement of steels - TEC Eurolab results for this questionWhen does sigma phase form in cast iron?When does sigma phase form in cast iron?For this reason it has a direct effect on the mechanical property of the metal.It can form when service temperature is within 565-952°C (1050-1700°F).The upper limit for sigma phase formation varies from 870 to 980°C (1600 to 1800°F) [35,28].For example,embrittlement in 304SS usually occurs slowly.Sigma Phase Formation and Embrittlement of Cast Iron (PDF) Manufacturing and Critical Applications of Stainless

Sigma () phase embrittlement - Man y stainl ess steels and other iron-chromium alloys are susceptible to a grain boundary phenomenon known as sigma-phase embrittlement.Sigma phase is

(PDF) The Effect of Nb and Ti on Structure and Mechanical

Sigma Phase Formation and Embrittlement of Cast Iron-Chromium- Nickel (Fe-Cr-Ni) Alloys.Article. Niobium addition to 15%Cr white cast iron can increase its wear resistance because 1.(1) Nb An Investigation on the Cracking of Air Tubes of Rotary Sep 28,2011·The formation of sigma phase can be very detrimental in many applications of Cr-rich iron alloys,because of its influence on the mechanical properties of the material resulting in embrittlement and corrosion penetration [ 13 ],high-temperature failure [ 14 ],metal dusting [ 15 ],and loss of toughness in heat treating and welding [ 16 ].Author Artur Jaworski,ukasz Krawczyk,Krzysztof KubiakEstimated Reading Time 3 minsPublish Year 2020(PDF) Sigma Phase Embrittlement of Stainless Steel in FCC Sigma phase is a non-magnetic intermetallic phase com posed mainly of iron and chromium which forms in ferritic and austenitic stainless steels during exposure at 560º-980ºC (1,050º-1,800ºF)

Author Goutam Mukhopadhyay,Sandip BhattacharyyaPublish Year 2011Formation of Oxide Accretions on Steckel Mill Drums

Sigma Phase Formation and Embrittlement of Cast Iron-Chromium- Nickel (Fe-Cr-Ni) Alloys.HK alloy is a member of the heat resistant cast alloy family (H-Series) steels.They are widely used in theCited by 13Publish Year 2017Author Abbas Bahrami,Ali Ashrafi,Seyed Mahdi Rafiaei,Maryam Yazdan Mehr,Maryam Yazdan MehrEmbrittlement of steels - TEC EurolabSigma-phase embrittlement.Prolonged service at 560 to 980 °C (1050 to 1800 °F) can cause formation of the hard,brittle sigma phase in both ferritic and austenitic stainless steels and similar alloys.Impact strength is greatly reduced,particularly when the metal has been cooled to about 260 °C (500 °F) or less.Graphitization.Cited by 331Publish Year 2012Author Chih-Chun Hsieh,Weite Wu- Alloy Lattice parameter Composition of phase (wt%) Composition of phase (wt%) Formula Alloy Lattice parameter Fe Formula Si Fe-Cr 0 = 8 .7 9 9 , 0 =-- Fe-Cr Fe-Mo 0 = 9 .1 8 8 , 0 =-- 10 rows on hindawiTurbine Housing Failure Due to Sigma Phase Precipitation Mar 18,2020·The phase increased the hardness and decreased the toughness,as well as the elongation of the turbine housing casting.Embrittlement caused by phase precipitation determined cracking initiation and propagation processes.As a result,turbine housing failed during industrial testing due to intergranular multicracking mechanism.

Cited by 53Publish Year 2008Author A.M.Babakr,A.Al-Ahmari,K.Al-Jumayiah,F.Habiby(PDF) Sigma Phase Formation and Embrittlement of Cast Iron

Vol.7,No.2 Sigma Phase Formation And Embrittlement 145 S31803 duplex s tainless steel aged treated at 850°C, Materials Research,July/Sept.2002,vol.5,no.3,p.385-389.Cracking of an austenitic stainless steel lance pipe in a Dec 01,2013·Sigma () phase is basically an ironchromium intermetallic compound that develops in stainless steels under prolonged exposure to high temperature (6001000 °C) ,,.Groesbeck solution (4 g NaOH + 4 g KMnO 4 + 100 g H 2 O) was prepared,and the ground and polished sample was dipped into the solution and heated at 90 °C for 150 s.Estimated Reading Time 6 minsMIMMI VIHERKOSKI SIGMA-PHASE FORMATION INroot of the embrittlement still often lies in the formation of the sigma-phase.This phase is a hard and extremely brittle intermetallic phase that forms within the temperature range of 650-870 °C.It does not necessarily influence the ductility at elevated tempera-tures.

Estimated Reading Time 6 minsSigma Phase Formation and Embrittlement of Cast Iron

HK alloy is a member of the heat resistant cast alloy family (H-Series) steels.They are widely used in the petrochemical industry for components requiring enhanced high temperature properties.Microstructural changes occurring at high temperature clearly affects its mechanical properties.These properties have been shown in HK-40 steel subjected to high-temperature degradation and prone to Estimated Reading Time 7 minsSigma Phase Formation and Embrittlement of Cast Iron Sigma Phase Formation and Embrittlement of Cast Iron-Chromium- Nickel (Fe-Cr-Ni) Alloys .By A.M.Babakr,A.Al-ahmari,K.Al-jumayiah and F.Habiby.Abstract.HK alloy is a member of the heat resistant cast alloy family (H-Series) steels. These properties have been shown in HK-40 steel subjected to high-temperature degradation and prone Ferrite content in stainless steel and embrittlement AMARINEDec 19,2019·SS will be 885*F (475*C) embrittlement and,or sigma-phase promotion by Ferrite content.The ferrite contained in Austenite SS is kept around 2-5% for weldability.The Embrittlement by Sigma phase is prevented by keep FN < 10 The Embrittlement by 475*C is

Grain boundary embrittlement by my and sigma phases in

Untersuchung der durch my- und sigma-Phasen in Superlegierungen auf Eisenbasis der Gueten 15 Cr - 25 Ni sowie 15 Cr - 40 Ni bewirkten Korngrenzenversproedung.Dabei Feststellung,Homogenization Heat Treatment to Reduce the Failure of Sep 19,2012·1.Introduction.In this chapter,influence of the homogenization heat treatment on the failure of heat resistant steel castings is studied.First,the cast stainless steels and effective factors on the failure of these steels are described.One of the most important factors is sigma phase embrittlement which is studied,in detail.Homogenization Heat Treatment to Reduce the Failure4.1.Formation mechanism of sigma phase in heat resistant steels Fig.4 shows the formation mechanism of sigma phase in the failed roller.The presence of delta-ferrite in the austenitic matrix leads to accelerated sigma-phase formation.Generally,this phase nucleates inside delta-ferrite.Transformation of delta-ferrite can be described by

Images of Sigma Phase Formation and Embrittlement of Cast

imagesSigma-Phase Embrittlement - Industrial HeatingFeb 29,2012·The most rapid sigma-phase formation occurs in the range of 700-900°C (1290-1650°F).Alloy elements such as molybdenum,titanium and silicon promote the formation of sigma phase,while nitrogen and carbon reduce its tendency to form.Sigma phase is an intermetallic compound consisting of chromium and iron,which is hard,brittle and non-magnetic.M.C.Blair,Cast Stainless Steels, Metals Handbook,ASM M.C.Blair,Cast Stainless Steels, Metals Handbook,ASM International,V.11990),page,908.has been cited by the following article TITLE Sigma Phase Formation and Embrittlement of Cast Iron-Chromium-Nickel (Fe-Cr-Ni) AlloysMagnetic hysteresis loop technique as a tool for the Abstract Fe-48 wt% Cr alloy was isothermally aged at 700 °C up to 250 h for the formation and growth of phase.Micro Vickers hardness and magnetic hysteresis loop (MHL) measurements were carried out at various lengths of time by interrupting the test to observe the change in mechanical and magnetic properties respectively.A small volume fraction of phase did not produce any change

Nickel Alloys Asm International

Sigma Phase Formation and Embrittlement of Cast Iron June 1st,2008 - HK alloy is a member of the heat resistant cast alloy family H Series steels They are widely used in the petrochemical industry for components requiring enhanced high temperature properties Microstructural changes occurring at high temperature clearly affectsOverview of Intermetallic Sigma ( ) Phase Precipitation 10 rows·An embrittlement region of phase can be shown in Shaeffler diagram of Figure 10 .Figure 10 Peckner,D.,Bernstein,I.M.,Handbook of Stainless Article citations More>>.Peckner,D.,Bernstein,I.M.,Handbook of Stainless Steels,McGraw-Hill,1977.has been cited by the following article:

STEEL CASTINGS HANDBOOK Supplement 9 High Alloy Data

STEEL CASTINGS HANDBOOK Supplement 9 High Alloy Data Sheets Heat Series Steel Founders Society of America 2004Sigma Phase Embrittlement Heat Treating Steel·Translate this pageThe most rapid sigma-phase formation occurs in the range of 700-900C (1290-1650F).Alloy elements such as molybdenum,titanium and silicon promote the formation of sigma phase,while nitrogen and carbon reduce its tendency to form.Sigma phase is an intermetallic compound consisting of chromium and iron,which is hard,brittle and non-magnetic.Sigma Phase Formation and Embrittlement of Cast Iron Sigma Phase Formation and Embrittlement of Cast Iron Chromium Nickel (Fe Cr Ni) Alloys 19 1 1

Sigma Phase Formation and Embrittlement of Cast Iron

Sigma Phase Formation and Embrittlement of Cast Iron-Chromium-Nickel (Fe-Cr-Ni) Alloys A.M.Babakr,A.Al-Ahmari,K.Al-Jumayiah,F.Habiby Saudi Basic Industries Corporation (SABIC)SABIC Technology Center-Jubail,P.O.Box 11669,Al-Jubail,31961 Saudi Arabia.DOI 10.4236/jmmce.2008.72011 PDF HTML 11,817 Downloads 17,519 Views CitationsSigma Phase Formation and Embrittlement of Cast Iron-Chromium-Nickel (Fe-Cr-Ni) Alloys.HK alloy is a member of the heat resistant cast alloy family (H-Series) steels.They are widely used in the petrochemical industry for components requiring enhanced high temperature properties.Sigma Phase Formation and Embrittlement of Cast Iron Was this helpful?People also askHow does sigma phase embrittlement affect stainless steel?How does sigma phase embrittlement affect stainless steel?Sigma phase embrittlement refers to the formation of a precipitate in the steel microstructure over a long period of time within this particular temperature range.The effect of the formation of this phase is to make the steel extremely brittle and failure can occur because of brittle fracture.Stainless Steel - High Temperature ResistanceSigma phase-induced failure of AISI 310 stainless steel Dec 01,2017·Obviously the higher the temperature,the faster is the kinetics of sigma phase formation.The presence of sigma in the microstructure at high temperature in essence is not a big deal.The major problem starts when the alloy is cooled down to temperatures below 260 °C.This results in almost complete loss of ductility .The furnace in this failure investigation is not intended to

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Jan 08,2002·Sigma phase embrittlement refers to the formation of a precipitate in the steel microstructure over a long period of time within this particular temperature range.The effect of the formation of this phase is to make the steel extremely brittle and failure can occur because ofTurbine Housing Failure Due to Sigma Phase Precipitation On-site investigation and experimental evaluations revealed that knife-line attack,embrittlement of weld metal detected due to sigma phase formation and thermal fatigue are responsible for the

What is sigma phase in duplex stainless steel? - Langley

Stainless Steels.Sigma phase is a chromium-rich intermetallic phase found in stainless steels,that forms when an alloy is cooled slowly through the range from around 1000degC to 550degC.The formation of these chromium-rich particles denudes the surrounding metal of chromium,thereby reducing its resistance to pitting corrosion.

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