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Heavy austempered ductile iron components

A technology for isothermal quenching and ductile iron, applied in the field of warm quenching ductile iron, which can solve the problems of rising cost and limited freedom of geometric shapes.

Inactive Publication Date: 2011-02-02
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These complete processing paths and large-scale machining (extensive machining) lead to a sharp rise in cost due to limited geometric freedom compared to the simple direct manufacturing of the cast ADI counterpart

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0007] Cast austempered ductile iron (ADI) can provide high quality reticulated components for shaft and gearbox components of heavy wind turbines greater than about 3 tons, more preferably greater than about 6 tons. Currently, wrought / hardened steel is used to manufacture large wind turbine shaft and gearbox components. However, wrought / hardened steels such as 34CrNiMo6 are relatively expensive materials that require complex processes to manufacture components, especially components larger than about 3 tons and having complex geometries. Manufacturing wrought / hardened steel components is even more expensive when the size increases to 6 tons or more, and there is a very limited supplier base worldwide. Typical steps required to manufacture heavy wind turbine gearbox components from high strength low alloy steels include melting ingots, preliminary rolling of ingots into billets, forging billets, forging parts, normalizing, austenitizing, water quenching, Tempering, and large-...

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PUM

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Abstract

The invention relates to heavy austempered ductile iron components. A component for wind turbines includes cast austempered ductile iron containing about 3.0 to about 3.8 weight percent carbon, about 1.9 to about 2.8 weight percent silicon, up to about 0.3 weight percent manganese, up to about 0.8 weight percent copper, up to about 2.0 weight percent nickel, up to about 0.3 weight percent molybdenum, about 0.03 to about 0.06 weight percent magnesium, less than about 0.05 weight percent chromium, less than about 0.02 weight percent vanadium, and less than about 0.01 weight percent sulfur. The component is preferably a drive shaft or gearbox component having a mass of more than about 3 tons. A method of manufacturing the component is also provided.

Description

technical field [0001] The present invention relates to austempered ductile iron for shaft and gearbox components of wind turbines. Background technique [0002] A wind turbine has a main shaft that transfers power from a rotor to a generator. As wind turbines increase their output from 1.5 and 2.5 megawatts (MW) to 3, 4, 5 and 6 MW, the size and required performance of wind turbine drive shafts also increases. Furthermore, loaded gearbox components such as planetary gear carriers, handles are also too high for conventional ductile iron grades (ferritic / pearlitic grades). Forged / hardened steel is the material of choice for gearbox components and drive shafts in sizes greater than 3 tons. The shaft is usually machined from a steel forging. The shaft material is usually a quenched-tempered high-strength low-alloy steel with critical fatigue properties. Examples include nickel chrome steels such as 34CrNiMo6 steel. [0003] Heavy forged steel wind turbine components proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C37/10F03D11/00C22C37/00
CPCF05C2201/0439Y02E10/722C22C37/04F05B2240/60C22C37/10C21D9/32C21D2211/005C21D2211/001F05B2230/21Y02E10/72Y02P10/32
Inventor J·朴G·K·布斯J·R·帕罗利尼S·萨蒂安
Owner GENERAL ELECTRIC CO
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