The Effects of Stress and Temperature on the Fatigue Crack Growth Behavior and Microstructural Evolution of Alloy 230

Jatu Burns, Megan Frary

Research output: Contribution to conferencePresentation

Abstract

Alloy 230, a nickel-based superalloy, is a candidate material for heat exchangers in very high temperature reactors. The heat exchangers are expected to see a wide range of operating conditions, so it is important to understand the effects of both stress and temperature on mechanical behavior and microstructural evolution. We studied crack growth behavior under controlled stress intensity factor near the threshold regime between 650 and 800°C. The tests were performed in using static and cyclic loads with various frequencies and stress ratios. In the different temperature regimes, the damage mechanism is dominated by different phenomena. Electron backscatter diffraction was used to observe the cracking mode and to characterize microstructure and texture at the crack tip. Transgranular cracks were observed from fatigue cracking. In grains near the crack tip, the local orientation spread increased in to as much as 5°, an indication of local deformation.

Original languageAmerican English
StatePublished - Feb 2010
EventTMS 2010 139th Annual Meeting & Exhibition -
Duration: 1 Feb 2010 → …

Conference

ConferenceTMS 2010 139th Annual Meeting & Exhibition
Period1/02/10 → …

EGS Disciplines

  • Materials Science and Engineering

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