inconel-alloy-718.pdf
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1、INCONELalloy 718 wwwwww. .s sp pe ec ci ia al lmme et ta al ls s. .c co omm -30831.312.50.25 -8630.611.80.30 7029.011.60.29 10029.811.50.30 20029.411.30.31 30028.811.10.30 40028.510.90.31 50028.010.60.32 INCONELalloy 718 (UNS N07718/W.Nr. 2.4668) is a high-strength, corrosion-resistant nickel chromi
2、um material used at -423 to 1300F. Typical composition limits are shown in Table 1. The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to postweld cracking, are outstanding. The ease and economy with which INCONEL alloy
3、 718 can be fabricated, combined with good tensile, fatigue, creep, and rupture strength, have resulted in its use in a wide range of applications. Examples of these are components for liquid fueled rockets, rings, casings and various formed sheet metal parts for aircraft and land-based gas turbine
4、engines, and cryogenic tankage. It is also used for fasteners and instrumentation parts. T Ta ab bl le e 1 1 - Limiting Chemical Compositiona, % Nickel (plus Cobalt).50.00-55.00 Chromium.17.00-21.00 Iron .Balance* Niobium (plus Tantalum).4.75-5.50 Molybdenum .2.80-3.30 Titanium.0.65-1.15 Aluminum .0
5、.20-0.80 Cobalt .1.00 max. Carbon.0.08 max. Manganese.0.35 max. Silicon.0.35 max. Phosphorus.0.015 max. Sulfur.0.015 max. Boron.0.006 max. Copper.0.30 max. P PH HY YS SI IC CA AL L C CO ON NS ST TA AN NT TS S A AN ND D T TH HE ER RMMA AL L P PR RO OP PE ER RT TI IE ES S Some physical constants of IN
6、CONEL alloy 718 are shown in Table 2. Modulus data appear in Tables 3 and 4, and thermal properties in Table 5. The values in these tables will vary slightly, depending on the composition and condition of the specimen tested. They are typical but are not suitable for specification purposes. T Ta ab
7、bl le e 2 2 - Physical Constants Density, lb/in3 Annealed.0.296 Annealed and Aged.0.297 Melting Range, F.2300-2437 C .1260-1336 Specific Heat at 70F, Btu/lb F (at 21C, J/kg C) .0.104 (435) Curie Temperature, F (C) Annealed Material.-320 (-196) Annealed and Aged Material .-170 (-112) Permeability at
8、200 oersted and 70F Annealed Material.1.0013 Annealed and Aged Material.1.0011 T Ta ab bl le e 3 3 - Modulus of Elasticity at Low Temperaturesa T Te emmp pe er ra at tu ur re e, , F F P Po oi is ss so on n s s R Ra at ti io o T To or rs si io on na al l MMo od du ul lu us s Y Yo ou un ng g s s MMo o
9、d du ul lu us s MMo od du ul lu us s o of f E El la as st ti ic ci it ty y, , k ks si i x x 1 10 03 3 aCold-rolled sheet heat-treated in accordance with AMS 5596B. aConforms to AMS specifications Publication Number SMC-045 Copyright Special Metals Corporation, 2007 (Sept 07) INCONEL is a trademark o
10、f the Special Metals Corporation group of companies. The data contained in this publication is for informational purposes only and may be revised at any time without prior notice. The data is believed to be accurate and reliable, but Special Metals makes no representation or warranty of any kind (ex
11、press or implied) and assumes no liability with respect to the accuracy or completeness of the information contained herein. Although the data is believed to be representative of the product, the actual characteristics or performance of the product may vary from what is shown in this publication. No
12、thing contained in this publication should be construed as guaranteeing the product for a particular use or application. *Reference to the balance of a composition does not guarantee this is exclusively of the element mentioned but that it predominates and others are present only in minimal quantiti
13、es. I IN NC CO ON NE EL L a al ll lo oy y 7 71 18 8 2 H HE EA AT T T TR RE EA AT TI IN NG G A AN ND D MME EC CH HA AN NI IC CA AL L P PR RO OP PE ER RT TI IE ES S For most applications, INCONEL alloy 718 is specified as: solution annealed and precipitation hardened (precipitation hardening, age hard
14、ening, and precipitation heat treatment are synonymous terms). Alloy 718 is hardened by the precipitation of secondary phases (e.g. gamma prime and gamma double-prime) into the metal matrix. The precipitation of these nickel- (aluminum, titanium, niobium) phases is induced by heat treating in the te
15、mperature range of 1100 to 1500F. For this metallurgical reaction to properly take place, the aging constituents (aluminum, titanium, niobium) must be in solution (dissolved in the matrix); if they are precipitated as some other phase or are combined in some other form, they will not precipitate cor
16、rectly and the full strength of the alloy with not be realized. To perform this function, the material must first be solution heat treated (solution annealed is a synonymous term). Two heat treatments are generally utilized for INCONEL alloy 718: Solution anneal at 1700-1850F followed by rapid cooli
17、ng, usually in water, plus precipitation hardening at 1325F for 8 hours, furnace cool to 1150F, hold at 1150F for a total aging time of 18 hours, followed by air cooling. Solution anneal at 1900-1950F followed by rapid cooling, usually in water, plus precipitation hardening at 1400F for 10 hours, fu
18、rnace cool to 1200F, hold at 1200F for a total aging time of 20 hours, followed by air cooling. If the material is to be machined, formed, or welded, it typically is purchased in the mill annealed or stress relieved condition. The material is then fabricated in its most malleable condition. After fa
19、brication, it can be heat treated as required per the applicable specification. -320-5.9d 707779753725- 20086877627337.31 400981007727557.53 6001111127757687.74 8001231247847757.97 10001351367987888.09 12001471488057948.39 14001601618027978.91 1600173173799796- 1800185186801800- 2000196199811796- A
20、An nn n + + A Ag ge ed d T Te emmp pe er ra at tu ur re e, , F F A An nn n. . 1 18 80 00 0 F F/ /1 1 h hr rA An nn n. . + + A Ag ge ed dA An nn n. . 1 18 80 00 0 F F/ /1 1 h hr r MMe ea an n L Li in ne ea ar r E Ex xp pa an ns si io on nb b, ,c c, , i in n/ /i in n/ / F F x x 1 10 0- -6 6 T Th he er
21、 rmma al l C Co on nd du uc ct ti iv vi it ty y, ,a a B BT TU U i in n/ /f ft t2 2 h h F F E El le ec ct tr ri ic ca al l R Re es si is st ti iv vi it ty y, ,a a o oh hmm c ci ir rc c mmi il l/ /f ft t T Ta ab bl le e 5 5 - Thermal Properties aAnnealing was 1800F/1 hr; aging was 1325F/8 hr, F.C. 20/
22、hr to 1150F, held at 1150F for total aging time of 18 hr. Conductivity calculated from resistivity values. bFrom 70F to temperature shown. cAnnealed 1750F/1 hr and aged 1325F/8 hr, F.C. to 1150F/8 hr, A.C. dSamples tested were in both the annealed (1750F/1 hr, A.C.) and annealed and aged (1750F/1 hr
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