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NiCrMoNb alloy with improved mechanical properties

An alloy, weight technology, used in the field of blades and nozzles, can solve problems that affect the reliability of the components

Inactive Publication Date: 2012-05-09
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, while many alloys can be used to address conditions that exist in certain parts of a turbine stage, they may ultimately require design compromises in other areas of the turbine assembly that will affect component reliability

Method used

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  • NiCrMoNb alloy with improved mechanical properties
  • NiCrMoNb alloy with improved mechanical properties
  • NiCrMoNb alloy with improved mechanical properties

Examples

Experimental program
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Embodiment

[0037] Alloy 625 was heat treated and samples were obtained from five different sources. Table 1 lists the compositions of the four samples A-D, along with the approximate minimum and maximum amounts of elements of the HTA in one embodiment of the present invention. Table 2 lists the compositions of the five samples A-E, along with the approximate minimum and maximum amounts of elements of the HTA in another embodiment of the present invention.

[0038] Table 1

[0039]

[0040] Table 2

[0041]

[0042]

[0043] Tensile and creep strength as well as stress-relaxation were measured for the as-received (ie mill annealed, prior to heat treatment) alloys and the material given a specific heat treatment at 677°C for 50 hours (hereafter referred to as HT2). Another heat treatment, hereinafter referred to as HT1, was applied to the as-is alloy, which consisted of annealing the alloy at 899°C (1650°F) for 1 hour, water quenching the alloy, and aging the alloy at 677°C (125...

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Abstract

A component made of an alloy including carbon at less than approximately 0.04 weight percent, manganese at about 0.0 to about 0.2 weight percent, silicon at about 0.0 to about 0.25 weight percent, phosphorus at about 0.0 to about 0.015 weight percent, sulfur at about 0.0 to about 0.015 weight percent, chromium from about 20.0 to about 23.0 weight percent, molybdenum from about 8.5 to about 9.5 weight percent, niobium from about 3.25 to about 4 weight percent, tantalum at about 0.0 to about 0.05 weight percent, titanium from about 0.2 to about 0.4 weight percent, aluminum from about 0.15 to about 0.3 weight percent, iron from about 3.0 to about 4.5 weight percent, and the remainder being nickel. The alloy may then be subjected to heat treatment procedures such as annealing at a temperature of less than approximately 982 DEG C and a duration of less than approximately one hour and aging at a temperature between approximately 538 DEG C and 760 DEG C and a duration of up to approximately 100 hours. Methods of treating an alloy are also disclosed.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of US Application Serial No. 12 / 436,194, filed May 6, 2009, entitled NiCrMoNb Alloys with Improved Mechanical Properties. This application claims priority from the filing date under 35 U.S.C. §120, and the entirety of said US application is hereby incorporated by reference. Background of the invention [0003] Embodiments of the present invention relate to improved nickel-chromium-molybdenum-niobium (NiCrMoNb) alloys. In particular, embodiments relate to this improved NiCrMoNb alloy and its use in a wide range of advanced steam turbine components including, but not limited to, buckets and nozzles. [0004] Components used in steam turbine components are typically constructed of nickel-chromium, martensitic or austenitic alloys. These alloys have good high strength and corrosion resistance properties which make them popular in industrial power generation applications. In addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22F1/10
CPCC22F1/10C22C19/05C22C19/055
Inventor A·卢普勒斯库R·E·迪伦巴赫R·C·施万特J·M·布雷斯纳克J·A·豪克
Owner GENERAL ELECTRIC CO