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alloy X-750 - Special Metals Company

INCONEL alloy alloy X-750 (UNS N07750/W. Nr. )is a precipitation-hardenable nickel-chromium alloyused for its corrosion and oxidation resistance and highstrength at temperatures to 1300 F. Although much ofthe effect of precipitation hardening is lost withincreasing temperature over 1300 F, heat -treatedmaterial has useful strength up to 1800 F. alloy X-750also has excellent properties down to cryogenictermperatures. Composition is shown in Table economics of INCONEL alloy X-750 coupledwith its availability in all standard mill forms hasresulted in applications in a wide variety of industrialfields. In gas turbines, it is used for rotor blades andwheels, bolts, and other structural members. INCONEL alloy X-750 is used extensively in rocket-engine thrustchambers. Airframe applications include thrustreversers and hot-air ducting systems.

INCONEL® alloy X-750 3 Table 6 - Applicable Heat Treatments for INCONEL Alloy X-750 Product Forms Intermediate-Temperature Service (Below 1100°F) – Equalized plus Precipitation-Treated Material

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Transcription of alloy X-750 - Special Metals Company

1 INCONEL alloy alloy X-750 (UNS N07750/W. Nr. )is a precipitation-hardenable nickel-chromium alloyused for its corrosion and oxidation resistance and highstrength at temperatures to 1300 F. Although much ofthe effect of precipitation hardening is lost withincreasing temperature over 1300 F, heat -treatedmaterial has useful strength up to 1800 F. alloy X-750also has excellent properties down to cryogenictermperatures. Composition is shown in Table economics of INCONEL alloy X-750 coupledwith its availability in all standard mill forms hasresulted in applications in a wide variety of industrialfields. In gas turbines, it is used for rotor blades andwheels, bolts, and other structural members. INCONEL alloy X-750 is used extensively in rocket-engine thrustchambers. Airframe applications include thrustreversers and hot-air ducting systems.

2 Large pressurevessels are formed from INCONEL alloy X-750 . Otherapplications are heat -treating fixtures, forming tools,extrusion dies, and test machine grips. For springs andfasteners, INCONEL alloy X-750 is used from sub-zeroto 1200 on the application and the propertiesdesired, various heat treatments are employed. Forservice above 1100 F, particularly where loads are to besustained for long times, optimum properties areachieved by solution treating (2100 F) plus stabilizationtreating (1550 F) plus precipitation treating (1300 F).For service below 1100 F, the alloy may bestrengthened by precipitation treating after hot or coldworking or by precipitation treating after equalizing orsolution treating. A furnace-cooling treatment is alsoused to develop optimum properties for someapplications. The various heat treatments and the propertiesdeveloped are described under the section onMechanical values in this bulletin the results ofextensive testing are typical of the alloy but, unlessshown as limiting, should not be used as CCoonnssttaannttss aannddTThheerrmmaall PPrrooppeerrttiieessSome physical constants and thermal properties ofINCONEL alloy X-750 are given in Tables 2 and for thermal expansion, thermal conductivity,specific heat , and diffusivity are from Lucks and Deemand electrical resistivity from tests conducted at of temperature on modulus of elasticity andadditional data on resistivity are in Tables 4 and 5.

3 Moremodulus values can be found in the section onMechanical 11 - Limiting Chemical Composition, %Publication No. SMC-067 Copyright Special Metals Corporation, 2004 (Sept 04)INCONEL, MONEL and NI-SPAN-C are trademarks ofthe Special Metals Corporation group of (plus Cobalt).. (plus Tantalum).. maxTTaabbllee 22 Physical Constants1 Determination not required for routine , Range, Temperature, FAs (2100 F/2 hr, ,+1500 F/24 hr, , + 1300 F/20 hr, )..-193 Magnetic Permeability, 70 F, 200 HAs (2100 F/2 hr, ,+1500 F/24 hr, , + 1300 F/20 hr, ).. Emissivity, oxidized surface600 Contraction during Precipitation Treatment (1300 F/20hr), aallllooyy XX--7755002 TTaabbllee 44 - Effect of heat Treatment on Room-TemperatureResistivity of Hot-Rolled BarTTaabbllee 55 - Modulus of ElasticityTaabbllee 33 - Thermal Propertiesaa Material heat - treated 2100 F/3 hr, , + 1550 F/24 hr, , + 1300 F/20 hr, PPrrooppeerrttiieessINCONEL alloy X-750 may be given any one of a variety of heat treatments.

4 Each develops Special properties and puts theproduct form in the best condition for its intended application. In all conditions, alloy X-750 is resistant to oxidation up to1800 F. The most often used heat treatments have been incorporated by the Society of Automotive Engineers in their AMSspecifications*for various product forms. The heat treatments, specifications, and product forms are summarized in Table 6.*AMS specifications are subject to revision. The ones referenced in this publication were current when it was released. Publisher is the Society of Automotive Engineers, s ratio = ,, FFMM eeaann LLiinneeaarrEExxppaannssiioonn,, FF xx1100--66ffrroomm 7700 FF ttooTTeemmppeerraattuurree SShhoowwnnTThheerrmmaallCCoonndduuccttii vviittyy,, fftt// 70 SSppeecciiffiicc HHeeaattBBttuu//llbb// FFDD iiffffuussiivviittyy,,ssqq fftt//hhrrEElleeccttrriiccaallRReessiiss ttiivviittyy,,oohhmm//cciirrccmmiill//ff ttHHeeaatt TTrreeaattmmeennttRReessiissttiivviittyy ,,oohhmm//cciirrcc mmiill//ffttAs hot-rolled2000 F/1 hr, F/1 hr, +1500 F/24 hr, + 1300 F/20 hr, F/1 hr, +1350 F/8 hr, to 1150 F,hold at 1150 F for total time of 18 hr, ,, FFSS ttaattiiccSSttaattiiccTToorrssiioonnTTee nnssiioonnMMoodduulluuss ooff EEllaassttiicciittyy.

5 110033 1600 1800 IINNCCOONNEELL aallllooyy XX--7755003 TTaabbllee 66 - Applicable heat Treatments for INCONEL alloy X-750 Product FormsIntermediate-Temperature Service (Below 1100 F) Equalized plus Precipitation- treated MaterialFor applications requiring high strength and ductility at servicetemperatures up to 1100 F, INCONEL alloy X-750 rod, bar,and forgings are given the following heat treatment:1625 F/24 hr, Equalizing1300 F/20 hr, Precipitation heat TreatmentThis heat treatment is described by AMS 5667, which requires that material so heat - treated have the following minimumroom-temperature properties. Hardness will lie in the range of 302-363 ,, BBaarrss aanndd FFoorrggiinnggssSSiizzee,, ,,kkssiiYYiieellddSSttrreennggtthh(( )),, kkssiiEElloonnggaattiioonniinn 44DD,,%%RReedduuccttiioonnooff AArreeaa%%Under and FFoorrmmRods, bars and forgingsRods, bars and forgingsRods, bars and forgingsRods, bars and forgingsSheet, strip and plate(Supplied in annealedcondition)Sheet, strip and plate(Supplied in annealedcondition)Sheet, strip and plate(Supplied in annealedcondition)Seamless tubingWire, No.

6 1 temperWire, spring temperWire, spring temperHHeeaatt TTrreeaattmmeenntt1625 F/24 hr, AC, + 1300 F/20 hr, AC(Equalizing plus precipitation treatment).1800 F anneal + 1350 F/8 hr, FC to 1150 F,Hold at 1150 F for total precipitation-treatingtime of 18 hr, AC (Solution treatment plus furnace-cool precipitation treatment).1800 F anneal + 1400 F/1 hr, FC to 1150 F,Hold at 1150 F for total precipitation-treatingtime of 6 hr, AC (Solution treatment plus shortfurnace-cool precipitation treatment).2100 F anneal + 1550 F/24 hr, AC, + 1300 F/20hr, AC (Triple heat treatment).1300 F/20 hr, AC (Constant-temperatureprecipitation treatment).1350 F/8 hr, FC to 1150 F, Hold at 1150 F fortotal precipitation-treating time of 18 hr, AC(Furnace-cool precipitation treatment).1400 F/1 hr, FC to 1150 F, Hold at 1150 F fortotal time of 6 hr, AC (Short furnace-coolprecipitation treatment).1300 F/20 hr, AC (Constant-temperatureprecipitation treatment).

7 1350 F/16 hr, AC (Constant-temperatureprecipitation treatment).1200 F/4 hr, AC (Constant-temperatureprecipitation treatment).2100 F anneal + 1550 F/24 hr, AC + 1300 F/20hr, AC (Triple heat treatment).RReemmaarrkkssHigh strength and notch rupture ductility up to1100 tensile properties and reduced heattreating time for service up to about 1100 furnace-cool aging. Achieves only slightlylower properties than does AMS 5670 and creep, relaxation and rupture strengthabove about 1100 strength to 1300 strength up to 1300 F (Increased tensileproperties to about 1100 F).Increased tensile properties and reducedheating time for service up to about 1100 strength up to about 1300 springs requiring optimum resistance torelaxation from about 700 F to 850 F and at lowto moderate stresses to about 1000 strength up to about 700 springs for service requiring maximumrelaxation resistance at about 850 F to 1200 ,5671,&5747-566855425598-558256985699569 9 IINNCCOONNEELL aallllooyy XX--7755004 IINNCCOONNEELL aallllooyy XX--775500 FFiigguurree relaxation of hot-rolled bar equalizedand precipitation- treated (1625 F/24 hr, ,+ 1300 F/20 hr, )FFiigguurree fatigue strength (108cycles) of tests (3450 rpm).

8 Stress, ksiStress, ksiTime, hrTemperature, FThe results of two series of tests of high-temperature tensileproperties are shown in Tables 7 and 8. Relaxation data arein Figure 1. Fatigue strength of equalized plus precipitation-treatedmaterial is higher than that of triple- heat - treated material(2100 + 1550 +1300 F) up to about 1200 F (see Figure 2).More data on high-temperature fatigue are shown in Figure3, and room-temperature notch fatigue is compared with testresults on smooth specimens in Figure 4. Pull-pull fatiguestrength of notched and smooth equalized and precipitation- treated rod is shown in Figure properties of hot-rolled bar equalized plusprecipitation- treated are given in Figure 6, and rupture livesof smooth and notched specimens in Figure 7. A Larson-Miller parameter plot of creep rupture data is shown inFigure fatigue strength of 5 hot-rolled material equalized and precipitation- treated (1625 F/24 hr+1300 F/20 hr).

9 Bending Stress, ksiCycles to FailureFFiigguurree strength of 3/4-in. hot-rolled bar equalized andprecipitation- treated (1625 F/24 hr, ,+ 1300 F/20 hr, ). rotating-beam tests at 10,000 rpm. Kt= , ksiCycles to FailureIINNCCOONNEELL aallllooyy XX--7755005 TTaabbllee 77 -- High-Temperature Properties of Hot-Rolled 13/16-in. BarEqualized and Precipitation- treated (1625 F/24 hr + 1300 F/20 hr).aAverage of 2 88 -- High-Temperature Tensile Properties of 3/4-in. Equalized andPrecipitation- treated Hot-Rolled Round (1625 F/24 hr, AC + 1300 F/20hr, AC).FFiigguurree Pull-pull fatigue strength of 1-in. hot-rolled rod equalizedand precipitation- treated (1625 F/24 hr, , + 1300 F/20 hr, ).Cycles to FailureMax. Stress, ksiSmooth SpecimenNotched SpecimenFFiigguurree properties of hot-rolled bar equalized andprecipitation- treated (1625 F/24 hr, , + 1300 F/20 hr, ).Creep Rate, %/1000 hrStress, ksiTime, hrStress, ksiFFiigguurree life of bar equalized and precipitation- treated (1625 F/24 hr, , + 1300 F/20 hr, ).

10 Smoothbar, dia. x 1 in. long; notched bar, 50% 60 V-notch, root SSttrreennggtthhEElloonnggaa--RReedduucc ttiioonnMMoodduulluuss ooffttuurree,, FFSS ttrreennggtthh,,(( OOffffsseett)),,ttiioonn,,ooff aarreeaa,,ooff EEllaassttiicciittyy iinnkkssiikkssii%%%%TTeennssiioonn,,1100 33 SSttrreennggtthhEElloonnggaa--RReedduucc ttiioonnttuurree,, FFSS ttrreennggtthh,,(( OOffffsseett)),,ttiioonn,,ooff aarreeaa,,kkssiikkssii%%%% aallllooyy XX--7755006 FFiigguurree Creep and rupture strength of hot-rolled bar equalizedand precipitation- treated (1625 F/24 hr. , +1300 F/20 hr, ).Intermediate-Temperature Service (Below 1100 F) Solution- treated plus Furnace-Cool Precipitation- treated MaterialFor applications requiring optimum tensile properties atservice temperatures below 1100 F, INCONEL alloy X-750rod, bar, and forgings are given the following heat treatment:1800 F Solution heat Treatment1350 F/8 hr, to 1150 F, hold at 1150 F for total time of 18 hr, Furnace-Cool Precipitation heat TreatmentThis heat treatment is described by AMS Specifications5670, 5671 and 5747, which require that heat -treatedmaterial have the following minimum room-temperatureproperties.


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