Overview of Inconel 718 material properties and application fields

Overview of Inconel 718 material properties and application fields

 

Inconel 718 superalloy (IN718 for short) has been used in aerospace engines for half a century. It was invented and used in turbine parts by INCO Huntington Alloys (now Special Meatals Co.) in the United States in the early 1960s. After manufacturing, IN718 has become the most widely used nickel-based high-temperature alloy material in the history of aerospace engines. The unique alloy composition design of IN718 gives it good comprehensive properties, that is, high strength, creep resistance and fatigue life, especially at temperatures below 650°C, its mechanical properties have good stability. Many parts of modern aeroengines, such as turbine disks, blades, brakes, shafts, stators, seals, supports, pipelines, fasteners, etc., are made of IN718.

Before the emergence of IN718, stainless steel materials (such as A286) and nickel-based alloys (such as RENE41) were widely used in turbine engines. However, these alloy materials cannot meet the requirements of continuously increasing engine operating temperatures and manufacturing costs. Among them, the mechanical properties of stainless steel materials that can precipitate out strengthening phases have poor stability under high temperature conditions; while RENE41, which contains a large amount of γ" strengthening phases, is prone to quenching cracks after heat treatment due to the low ductility of the material itself. As a result, manufacturing increased and maintainability decreased. The emergence of IN718 solved these problems well, and it quickly became widely used in the field of turbine engine manufacturing.

To sum up, the reasons for the rapid growth of IN718 industrial applications can be attributed to the following points:

(1) There are no commercial or intellectual property restrictions, and manufacturers and material suppliers can mass-produce and adopt products based on this material;

(2) Because the IN718 strengthening phase precipitates slowly, the material has good weldability and castability;

(3) IN718 has high strength at high temperatures (below 650°C), and its good ductility makes it easy to accept various processing forms. Therefore, Inconel718 has been quickly accepted by major turbine engine manufacturers and used in actual production due to its fairly balanced performance in all aspects and low cost. It can be said that the emergence of Inconel718 has promoted the revolutionary development of turbine engine design and manufacturing, and played an important role in reducing engine weight, simplifying structure and reducing manufacturing costs.

To sort it out, in the 1960s, Inconel718 was first used on a large scale in the military aircraft engine series produced by GE and P&W companies in the United States, such as the compressor blades and discs in GE's TF39 and LM2500 engine series, and P&W's Key components such as machine brakes in J58, TF30 and F100 engine series. 1970s. IN718 material began to be used on a large scale in civilian engine blades. Among all machined and formed parts, IN718 accounts for 34% of the material, most of which are machined in the form of forgings and casting blanks. On P&W's PW4000 engine, nickel-based alloys account for 39% of the total engine weight. %, 57% of which comes from Inconel718 material. These data illustrate that the dominant application of IN718 material in aeroengines continues to this day.

In the history of aviation development for so many years, the rapid changes in materials represent the embodiment of human civilization. Today, with the highly developed Internet, many times we only need to gently press the Enter key to get a lot of information that we have needed for a long time in the past. information that can be obtained,

Inconel alloy Inconel series: (inconel 600, inconel 601, inconel 625, inconel 690, inconel 718, inconel X-750, inconel 617)

Incoloy series: (Incoloy 800,800H/HT,Incoloy 825,Incoloy 925,Incoloy 926,Incoloy 901)

Monel series (Monel 400, Monel K500)

Hastelloy Hastelloy: Hastelloy c-276, Hastelloy c-4, Hastelloy c-22, Hastelloy c-2000, Hastelloy

High temperature alloy GH series: (GH3030, GH3044, GH3039, GH2132, GH3128, GH4169)

Corrosion-resistant alloy: (NS112, NS312, NS321, NS336, NS142),

Pure Nickel Series: (Pure Nickel 201, 200, Nickel200, Nickel201)

Special stainless steel series: (904L, 2205, 2507, 309S, 310S, 310Si2, 254SMO, 316LMod, 17-4PH, 17-7PH, 15-5PH, 630, 631, 632, S31803/2205, S32750/)

Precision alloy series: lJ06, 1J12, lJl3, 1J16, lJl7, 1J18, 1J22, 1J30, 1J31, 1J50, 2J04, 2J07, 2J10, 3J21, 3J53, 4J29, 4J32, 4J49, 4J50, 6J24, 6J32, 6J24