METHODS FOR PROCESSING NANOSTRUCTURED FERRITIC ALLOYS, AND ARTICLES PRODUCED THEREBY

摘要

A method of forming an article including a nanostructured ferritic alloy is provided. The method provides steps for substantially inhibiting grain growth of a workpiece that includes nanostructured ferritic alloy, during heating and deforming at high temperatures and at high strain rates. Advantageously, the article is formed via conventional high strain rate techniques and thus, cost savings are provided. Articles are also provided which are formed by the method, and the articles so produced exhibit good mechanical properties at high operating temperatures, and thus are utilized as turbomachinery components, and in particular, component of a heavy duty gas turbine or steam turbine. A turbomachinery component comprising an NFA is provided.

主权项

1. A method comprising:
introducing a quantity of strain into a workpiece at a first temperature below about 1900 degrees Fahrenheit to form a strained workpiece; heating the strained workpiece to a second temperature, wherein the second temperature is at least about 1900 degrees Fahrenheit; and deforming the strained workpiece at the second temperature,
wherein the workpiece comprises a nanostructured ferritc alloy (NFA), and wherein the quantity of strain introduced into the workpiece at the first temperature is effective to substantially inhibit grain growth in the strained workpiece during the heating and the deforming at the second temperature.