INCONEL 751 qotishmasining umumiy xususiyatlari
Inconel 751/ Qotishma 751/2.4694/ N07751
kimyoviy tarkibi
C(%): 0 dan kichik yoki unga teng.10
Si(%): 0.01 dan kichik yoki unga teng
Mn(%): 1 dan kichik yoki unga teng.00
Cr(%): 14.0-17.0
Ni(%): 70.0 dan katta yoki unga teng
Mo(%): -
Co(%): -
W(%): -
Al(%): 0.90-1.50
Cu(%): 0,50 dan kichik yoki unga teng
Ti(%): 2.00-2.60
Fe(%): 5.00-9.00
Boshqalar (%): Nb {0}}.70-1.20, S 0,01 dan kichik yoki teng, Nb 2.50-3.50
Inconel 751 - 750 ga o'xshash cho'kma-qattiqlashtiruvchi yuqori haroratli qotishma. U mukammal aşınma qarshilik, mukammal quvvat, korroziyaga chidamlilik va yuqori harorat sharoitida issiq qattiqlikka ega. Ichki yonish dvigatellari va boshqalardagi egzoz klapanlari uchun ishlatiladi.
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 daraja, nikel qotishmalari taxminan 950 daraja bo'lsa, temirga asoslangan qotishmalar<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.
Nikel qotishmasining yuqorida aytib o'tilgan afzalliklari o'zining ba'zi ajoyib funktsiyalari bilan bog'liq. Nikel juda barqaror tuzilishga ega bo'lgan yuz markazli kub bo'lib, xona haroratidan yuqori haroratgacha allotropik o'zgarishlarga uchramaydi; bu asosiy materialni tanlash uchun juda muhimdir. Ma'lumki, ostenitik strukturaning ferrit tuzilishiga nisbatan bir qator afzalliklari bor.
Nikel yuqori kimyoviy barqarorlikka ega, 500 darajadan past oksidlanish deyarli yo'q va akademik haroratda issiq havo, suv va ma'lum tuzli suvli eritmalar ta'sir qilmaydi. Nikel sulfat kislota va xlorid kislotada sekin eriydi, lekin nitrat kislotada tez eriydi.
Nikel katta qotishma qobiliyatiga ega va hatto o'ndan ortiq turdagi qotishma elementlarni qo'shish zararli fazalarni keltirib chiqarmaydi, bu nikelning turli xususiyatlarini yaxshilash uchun potentsial imkoniyatlarni beradi.
INCONEL 751 qotishmasining umumiy xususiyatlari
Inconel Alloy 751 - Inconel Alloy X-750 ga o'xshash nikel-xromli material. Alyuminiy tarkibini oshirib, u ko'proq yog'ingarchilik bilan qattiqlashadi. Bu ajoyib xususiyatlarga erishish uchun yoshga qarab qattiqlashishi mumkin bo'lgan yuqori quvvatli nikel asosidagi super qotishma. Qotishma kimyoviy ta'sirga va oksidlanishga chidamli va 1200/1500F (650/820C) harorat oralig'ida yuqori stresslar ostida yaxshi siljish kuchiga ega. 1600F (870C) harorat oralig'ida yaxshi sindirish xususiyatlari. Ichki yonish dvigatellari uchun egzoz klapanlari sifatida keng qo'llaniladi. Ushbu qotishma qo'rg'oshin oksidi, oltingugurt, brom va xlorni o'z ichiga olgan issiq chiqindi gazlarda yuqori aşınma qarshilik va korroziyaga chidamlilik uchun ish haroratida yuqori quvvatni, yuqori haroratli qattiqlikni ta'minlaydi.
