Dynamic Strain Ageing of an Austenitic Superalloy: Temperature and Strain Rate Effects

Document Type

Article

Publication Date

7-2008

Publication Title

Materials Science and Engineering A

Volume

474

Issue

1-2

First page number:

363

Last page number:

370

Abstract

The tensile data involving austenitic Alloy C-276 suggest that this alloy is capable of maintaining appreciable structural strength at temperatures relevant to the sulfuric acid decomposition process related to the nuclear hydrogen initiative. Reduced failure strain and formation of serrations, characteristics of dynamic strain ageing (DSA), were noted within susceptible temperature regimes. An average activation energy of 55 kJ/mol, and work hardening index ranging from 0.68 to 0.75 were determined as functions of different testing temperature and strain rates. The occurrence of DSA was also associated with enhanced dislocation density. Depending on the testing temperature, a combination of ductile and intergranular brittle failures was observed with the tested specimens.

Keywords

Activation energy; Alloy C-276; Austenite; Dislocation density; Dislocations in metals; Dynamic strain aging; Heat resistant alloys; Steel alloys – Fatigue; Strain hardening; Work hardening index

Disciplines

Materials Science and Engineering | Mechanical Engineering | Mechanics of Materials | Metallurgy

Language

English

Permissions

Use Find in Your Library, contact the author, or interlibrary loan to garner a copy of the item. Publisher policy does not allow archiving the final published version. If a post-print (author's peer-reviewed manuscript) is allowed and available, or publisher policy changes, the item will be deposited.

UNLV article access

Search your library

Share

COinS