Airíonna Ginearálta Cóimhiotal ICONEL 751
Inconel 751/ Cóimhiotal 751/2.4694/ N07751
comhdhéanamh ceimiceach
C(%): Níos lú ná nó cothrom le 0.10
Si(%): Níos lú ná nó cothrom le 0.01
Mn(%): Níos lú ná nó cothrom le 1.00
Cr(%): 14.0-17.0
Ni(%): Níos mó ná nó cothrom le 70.0
Mo(%): -
Co(%):-
W(%): -
Al(%): 0.90-1.50
Cu(%): Níos lú ná nó cothrom le 0.50
TI(%): 2.00-2.60
Fe(%): 5.00-9.00
Daoine eile (%): Nb {{0}}.70-1.20, S Níos lú ná nó cothrom le 0.01, Nb 2.50-3.50
Is cóimhiotal ardteochta crua-taisce é Inconel 751 cosúil le 750. Tá friotaíocht caitheamh den scoth aige, neart den scoth, friotaíocht creimeadh agus cruas te faoi choinníollacha teocht ard. Úsáidtear é le haghaidh comhlaí sceite ar innill dócháin inmheánaigh, etc.
High-temperature alloy refers to a type of metal material based on iron, nickel, and cobalt that can work for a long time under high temperatures above 600°C and certain stress; it also has high high-temperature strength and excellent anti-oxidation and anti-corrosion properties. Excellent fatigue properties, fracture toughness and other comprehensive properties. High-temperature alloys are single austenitic structures that have excellent structural stability and operational reliability at various temperatures. Based on the above performance characteristics, and the high degree of alloying of high-temperature alloys, they are also called "superalloys". An important material widely used in aviation, aerospace, petroleum, chemical industry, and ships. According to the matrix elements, high-temperature alloys are divided into iron-based, nickel-based, cobalt-based and other high-temperature alloys. The application temperature of iron-based high-temperature alloys can generally only reach 750~780°C. For heat-resistant parts used at higher temperatures, nickel-based and refractory metal-based alloys are used. Nickel-based superalloys occupy a particularly important position in the entire field of superalloys. They are widely used to make the hottest parts of aviation jet engines and various industrial gas turbines. If 150MPA-100H durability strength is used as the standard, the current maximum temperature that nickel alloys can accept is >1100 céim , cé go bhfuil cóimhiotail nicil thart ar 950 céim , tá cóimhiotail iarainn-bhunaithe<850℃, that is, nickel-based alloys are correspondingly 150℃ higher. to about 250℃. So people call nickel alloy the heart of the engine. At present, in advanced engines, nickel alloys account for half of the total weight. Not only turbine blades and combustion chambers, but also turbine disks and even subsequent compressor blades have begun to use nickel alloys. Compared with iron alloys, the advantages of nickel alloys are: higher working temperature, stable structure, less harmful properties, and greater resistance to oxidation and corrosion. Compared with cobalt alloys, nickel alloys can work at higher temperatures and stresses, especially in moving blades.
Baineann na buntáistí thuasluaite a bhaineann le cóimhiotal nicil le cuid dá fheidhmeanna den scoth féin. Is ciúb aghaidh-lárnach é nicil le struchtúr an-chobhsaí agus ní dhéantar athruithe allotrópacha ó theocht an tseomra go teocht ard; tá sé seo an-tábhachtach chun bunábhar a roghnú. Tá a fhios go maith go bhfuil sraith buntáistí ag struchtúr austenític thar struchtúr ferrite.
Tá cobhsaíocht cheimiceach ard ag nicil, beagnach aon ocsaídiú faoi bhun 500 céim, agus níl tionchar ag aer te, uisce agus réitigh uiscí salainn áirithe ag teocht acadúil. Díscaoileann nicil go mall in aigéad sulfarach agus aigéad hidreaclórach, ach tuaslagann sé go tapa in aigéad nítreach.
Tá cumas cóimhiotalaithe iontach ag nicil, agus fiú trí níos mó ná deich gcineál d'eilimintí cóimhiotail a chur leis, ní tháirgeann sé céimeanna díobhálacha, rud a thugann féidearthachtaí féideartha chun airíonna éagsúla nicil a fheabhsú.
Airíonna Ginearálta Cóimhiotal ICONEL 751
Is ábhar nicil-cróimiam é Inconel Alloy 751 cosúil le Inconel Alloy X-750. Trí mhéadú ar an ábhar alúmanam, tá sé hardening deascadh níos mó. Is superalloy ard-neart nicil-bhunaithe é seo is féidir a aois-chruaite chun airíonna den scoth a bhaint amach. Tá an cóimhiotail resistant d'ionsaí ceimiceacha agus ocsaídiúcháin agus tá neart creep maith aige faoi strusanna ard sa raon teochta 1200/1500F (650/820C). Airíonna briseadh maith sa raon teochta 1600F (870C). Úsáidtear go forleathan mar chomhlaí sceite le haghaidh innill dócháin inmheánaigh. Soláthraíonn an cóimhiotal seo ard-neart ag teocht oibriúcháin, cruas teocht ard le haghaidh friotaíocht caitheamh ard agus friotaíocht creimeadh i ngás sceite te ina bhfuil ocsaíd luaidhe, sulfair, bróimín agus clóirín.
