Splošne lastnosti zlitine INCONEL 751
Inconel 751/ Zlitina 751/2.4694/ N07751
kemična sestava
C(%): manj kot ali enako 0.10
Si(%): manj kot ali enako 0,01
Mn(%): manj kot ali enako 1.00
Cr (%): 14.0-17.0
Ni (%): Večji ali enak 70.0
Mo (%): -
Co (%): -
W(%): -
Al(%): 0.90-1}.50
Cu(%): manj kot ali enako 0,50
Ti(%): 2.00-2.60
Fe (%): 5.00-9.00
Drugo (%): Nb {{0}}.70-1.20, S Manjše ali enako 0,01, Nb 2.50-3.50
Inconel 751 je visokotemperaturna zlitina z nanašanjem, podobna 750. Ima odlično odpornost proti obrabi, odlično trdnost, odpornost proti koroziji in vročo trdoto pri visokih temperaturah. Uporablja se za izpušne ventile motorjev z notranjim zgorevanjem itd.
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 stopinj, medtem ko so nikljeve zlitine okoli 950 stopinj, zlitine na osnovi železa so<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.
Zgoraj omenjene prednosti nikljeve zlitine so povezane z nekaterimi njenimi odličnimi funkcijami. Nikelj je kocka s ploskvijo in zelo stabilno strukturo in ni podvržena alotropskim spremembam od sobne do visoke temperature; to je zelo pomembno za izbiro osnovnega materiala. Dobro je znano, da ima avstenitna struktura vrsto prednosti pred feritno strukturo.
Nikelj ima visoko kemično stabilnost, skoraj ne oksidira pod 500 stopinjami in nanj ne vplivajo topel zrak, voda in nekatere vodne raztopine soli pri akademskih temperaturah. Nikelj se počasi topi v žveplovi kislini in klorovodikovi kislini, vendar se hitro topi v dušikovi kislini.
Nikelj ima veliko legirno sposobnost in tudi z dodajanjem več kot deset vrst legirnih elementov ne nastanejo škodljive faze, kar daje potencialne možnosti za izboljšanje različnih lastnosti niklja.
Splošne lastnosti zlitine INCONEL 751
Inconel Alloy 751 je nikelj-kromov material, podoben Inconel Alloy X-750. S povečanjem vsebnosti aluminija ima večjo precipitacijsko utrjevanje. To je visokotrdna superzlitina na osnovi niklja, ki jo je mogoče utrditi s staranjem in tako doseči odlične lastnosti. Zlitina je odporna na kemične napade in oksidacijo ter ima dobro odpornost proti lezenju pod visokimi obremenitvami v temperaturnem območju 1200/1500F (650/820C). Dobre lastnosti lomljenja v temperaturnem območju 1600F (870C). Pogosto se uporabljajo kot izpušni ventili za motorje z notranjim zgorevanjem. Ta zlitina zagotavlja visoko trdnost pri delovnih temperaturah, visoko temperaturno trdoto za visoko odpornost proti obrabi in odpornost proti koroziji v vročih izpušnih plinih, ki vsebujejo svinčev oksid, žveplo, brom in klor.
