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Nickel alloy and method of direct aging heat treatment

A nickel-based alloy, direct technology, applied in the field of nickel-based alloys and direct-aged nickel-based alloys, which can solve problems such as poor machinability and weldability

Inactive Publication Date: 2008-03-12
ATI PROPERTIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these alloys suffer from poor machinability and weldability, and are more expensive than Alloy 718, due in part to higher levels of expensive alloying elements

Method used

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  • Nickel alloy and method of direct aging heat treatment

Examples

Experimental program
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Embodiment 1

[0046] In a first embodiment, the solution treated and aged 718Plus  Mechanical Properties of Alloys Compared to Directly Aged 718Plus According to a Non-limiting Embodiment of the Invention Disclosure  The mechanical properties of the alloys were compared. The mechanical properties of the 3 processing conditions were tested and the result was a particle size variation from 12 to 7 with ASTM in the product. The results are listed in Table 1 - Solution-aged and direct-aged 718Plus manufactured with different processing conditions  Comparison of mechanical properties between alloy products. SA = solution aged, DA = direct aged, AC = air cooled, FC = furnace cooled and CW = cold worked.

[0047] The 718Plus of this embodiment  Alloy samples were manufactured as follows. Solution treated and aged alloy samples were solution treated by heating at 954°C (1750°F) for 1 hour, followed by air cooling. Then, the sample was aged at 788°C (1450°F) for 2 hours, cooled from 788°C ...

Embodiment 2

[0056] This example was designed to measure satisfactory processing conditions for various non-limiting embodiments of the method of the present invention. In this example, from 718Plus  A 25.4 cm diameter round billet of nickel base alloy was cut into two sets of four 5.08 cm x 5.08 cm x 5.08 cm cubes. The cube was heated to a series of different temperatures between 927°C (1700°F) and 1093°C (2000°F). Then, all cubes are processed as follows. First, the cubes were reduced to a thickness of 3.81 cm in the first rolling pass and further reduced to a thickness of 2.54 cm in the second rolling pass after reheating to the specified processing temperature. Flat cubes (or "pancakes") 2.54 cm thick were reheated for approximately 0.5 hours at a finish forging temperature range of 1093°C (2000°F) to 927°C (1700°F) (as shown in Table 2), and rolled In the manufacturing pass, it was further reduced to a 1.27 cm thick wafer (50% reduction in the final working rolling pass). The res...

Embodiment 3

[0065] This example is designed to determine the effect of heating time on a 718Plus at a thermal processing temperature  Effects on the mechanical properties of nickel-based alloys. This test is carried out due to the rather long heating times in some industrial practices, especially for heavy billets with large cross-sections. 718Plus  Nickel-base alloy samples were heated at the forging temperature of 927°C (1700°F) or 954°C (1750°F) for 0.5 hours or 3 hours. Half of the samples were then solution treated and aged as outlined in Example 1. The other half of the samples were directly aged according to a non-limiting embodiment of the invention as described in Example 1.

[0066] Tensile testing was performed at 704°C (1300°F) and stress-rupture testing at 704°C (1300°F) and 552 MPa (80 ksi). Table 3 lists the results of the effect of forging temperature - the effect of heating time at forging temperature on the effect of direct aging.

[0067] The results shown in Tab...

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Abstract

Embodiments of the present disclosure relate to nickel-base alloys and methods of direct aging nickel-base alloys. More specifically, certain embodiments of the present disclosure relate to methods of direct aging 718Plus< TM > nickel-base alloy to impart improved mechanical properties, such as, but not limited to, tensile strength, yield strength, low cycle fatigue, fatigue crack growth, and creep and rupture life to the alloys. Other embodiments of the present disclosure relate to direct aged 718Plus< TM >nickel-base alloy, and articles of manufacture made therefrom, having improved mechanical properties, such as, but not limited to, tensile strength, yield strength, low cycle fatigue, fatigue crack growth, and creep and rupture life.

Description

Background technique [0001] Embodiments of the present disclosure relate to nickel-based alloys and methods of directly aging nickel-based alloys. More specifically, certain embodiments disclosed herein relate to direct aging 718Plus  Approaches to nickel-based alloys to impart improved mechanical properties such as, but not limited to, tensile strength, yield strength, low cycle fatigue life, fatigue crack growth, and creep and fracture life of the alloy. Other embodiments of the present disclosure relate to directly aged 718Plus  Nickel-based alloys, and articles made therefrom, having improved mechanical properties such as, but not limited to, tensile strength, yield strength, low cycle fatigue life, fatigue crack growth, and creep and fracture life. [0002] The performance of gas turbine engines has improved over the years with improvements in the high temperature mechanical properties of nickel-based superalloys. These alloys are the materials of choice for most gas...

Claims

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Application Information

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IPC IPC(8): C22F1/10
Inventor 理查德·L·肯尼迪曹维涤
Owner ATI PROPERTIES
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