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sigma-phase embrittlement

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Journal Articles
Alloy Digest (1980) 29 (7): SS-373.
Published: 01 July 1980
... 1 to 5 on the ASTM scale. RA 800H is free from embrittlement by sigma-phase formation. This alloy is well suited for high-temperature processing in refining or petrochemical service. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well...
Journal Articles
Alloy Digest (1975) 24 (3): SS-307.
Published: 01 March 1975
..., thus it is not susceptible to embrittlement from sigma phase formation. Type HP was developed for rugged steel-mill furnace-roll service; no comparable wrought alloy exists. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It...
Journal Articles
Alloy Digest (1996) 45 (10): SS-655.
Published: 01 October 1996
... Uranus 800 HT is a variant of a high chromium and nickel austenitic alloy that combines good corrosion and creep resistance. The alloy is solution annealed to produce a large grain size and remains stable, not being embrittled by the precipitation of sigma phase. This datasheet provides...
Journal Articles
Alloy Digest (1971) 20 (9): SS-259.
Published: 01 September 1971
... breaking whereas Type 446 breaks with this sharp bend. Embrittlement: Annco 18 SR and AISI Type 446 stainless steels were exposed in the annealed condition at 14000F for various times up to 3000 hours. After 3000 hours, neither material shows any sign of sigma phase or embrittlement. Armco 18 SR and Type...
Journal Articles
Alloy Digest (2011) 60 (5): SS-1092.
Published: 01 May 2011
... as rapidly as possible to prevent 475 embrittlement and sigma- phase embrittlement. Pickling. A mixture of nitric and hydrofluoric acids is used in pickling. To the extent the NAS 329J3L is more resistant to corrosion than AISI Type 304, descaling is more difficult. Alkaline immersion for a short...
Journal Articles
Alloy Digest (1982) 31 (5): SS-407.
Published: 01 May 1982
... of the welded fabrication. Both sigma phase and the effects of 885OF embrittlement can be removed by a one-hour anneal at 1500°F (840°C). rapid cool. Ductility can be restored largely after 885°F embrittlement by heating at 1200°F (650°C) for one hour at temperature and cooling rapidly. Machining...
Journal Articles
Alloy Digest (2006) 55 (9): SS-975.
Published: 01 September 2006
... sigma phase embrittlement. Oxidation Resistance. Alloy 330 has good oxidation resistance and resists scale formation up to about 1095 °C (2000 °F). Any scale that is formed is tightly adherent, particularly under cyclic conditions of heating and cooling. Carburization Resistance. The 35% nickel content...
Journal Articles
Alloy Digest (2010) 59 (8): SS-1072.
Published: 01 August 2010
... ºC (2133 and 1976 ºF). The quenching should be carried out as rapidly as possible to prevent 475 embrittlement and sigma-phase embrittlement. Pickling. A mixture of nitric and hydrofluoric acids is used in pickling. To the extent the NAS 64 is more resistant to corrosion than AISI type 304, descaling...
Journal Articles
Alloy Digest (2010) 59 (7): SS-1070.
Published: 01 July 2010
... and 2. Heat Treatment: Quenching is required after heating to the solution treatment temperature of between 1080 and 1120 ºC (2194 and 2048 ºF). The quenching should be carried out as rapidly as possible to prevent 475 (885) and sigma-phase embrittlement. Pickling. A mixture of nitric and hydrofluoric...
Journal Articles
Alloy Digest (1989) 38 (8): SS-267.
Published: 01 August 1989
... inlossofroom-temperatureductility.Ductilitycanberestoredby short-timetreatmentat600°C(1 llO F)andrapidaircooling.The alloy is also susceptible to sigma phase embrittlement by long exposure at 550-750°C (1020-1380°F). Weldability of the alloy is good and bending and straightening operations are feasible. Forms...
Journal Articles
Alloy Digest (2002) 51 (12): SS-869.
Published: 01 December 2002
... detrimental precipitate phases such as sigma. The AL 2003 alloy can be considered for use in environments where resistance to general corrosion and chloride stress-corrosion is important. Product Forms Available: Products available include plate, sheet, strip, welded tube, and welded pipe. Producer: Allegheny...
Journal Articles
Alloy Digest (2003) 52 (11): SS-892.
Published: 01 November 2003
... 475 °C (885 °F) and sigma phase embrittlement. Formability: DuraFoil has good formability in the annealed condition. Formability of cold-rolled DuraFoil is limited to bending. DURAFOILTM Filing Code: SS-892 Stainless Steel November 2003 DURAFOILTM (Ferritic Stainless Steel, Heat-Resistant Alloy...
Journal Articles
Alloy Digest (2018) 67 (4): SS-1284.
Published: 01 April 2018
... or cooling through this temperature range should thus be avoided. The effects of 475 embrittlement (887 °F) can be reversed by briefly heating to within the temperature range 700 800 °C (1292 1472 °F). Due to the high chromium content of this steel, it is susceptible to embrittlement by sigma phase...
Journal Articles
Alloy Digest (2018) 67 (5): SS-1285.
Published: 01 May 2018
... this temperature range should thus be avoided. The effect of 475 embrittlement can be reversed by briefly heating to within the temperature range 700 800 °C (1292 1472 °F). This steel is also susceptible to embrittlement by sigma phase formation within the temperature range 600 800 °C (1112 1472 °F...
Journal Articles
Alloy Digest (2013) 62 (4): SS-1141.
Published: 01 April 2013
... uniformly at 900 1205 ºC (1650 2200 ºF). Minimum forge temperature is 900 ºC (1650 ºF) to avoid embrittlement due to interme- tallic phase precipitation. Parts should be rapidly cooled in water (preferred) or air. Parts should be solution annealed after forging to ensure the structure is free of sigma...
Journal Articles
Alloy Digest (2018) 67 (7): SS-1291.
Published: 01 July 2018
... properties and corrosion resistance. The sigma phase precipitates at between 600 and 1000 °C (1112 and 1832 °F), after a holding time of a few minutes. The alpha precipitation phase at between 350 and 550 °C (662 and 1022 °F) also poses a risk of embrittlement. Product Forms Available Round bars in rolled...
Journal Articles
Alloy Digest (2018) 67 (6): SS-1289.
Published: 01 June 2018
... of sigma phase. Solution annealing is then optimal. If forging finishes around 900 °C, mechanical properties (YS and UTS) will increase due to strain-hardening. Wire drawing-profiling. This grade is suitable for wire drawing and can be work hardened more than a 316L (1.4404), in comparable fashion to...
Journal Articles
Alloy Digest (1980) 29 (9): SS-375.
Published: 01 September 1980
..., 1350-1400°F (735-760°C), followed by rapid air cool or water quench, depending upon thickness and complexity of the welded fabrication. Both sigma phase and the effects of 885OF embrittlement may be removed by a one-hour anneal at 1500°F (840°C), rapid cool. Ductility may be largely restored after 88S...
Journal Articles
Alloy Digest (1996) 45 (11): SS-661.
Published: 01 November 1996
... considerably more resistant to sigma formation than other duplex stainless steels and some heat-resistant steels. Ta- bles 3 and 4 cover high-temperature oxidation resistance and the corresponding bend teats (which reveal embrinlement due to sigma phase). Nitmnic 19D exhibited no sigma formation at%zr 14 days...
Journal Articles
Alloy Digest (2010) 59 (3): SS-1056.
Published: 01 March 2010
... deformed structure, it can also induce formation of the embrittling phase, sigma. Components with heavy cross should be rapidly cooled by water quenching to avoid sigma formation. Alloy 25-6HN products or components exposed to temperatures between 595 and 925 °C (1100 and 1700 °F) during service or hot...