Ferritic Alloys with Extreme Creep Resistance via Coherent Hierarchical Precipitates.

ABSTRACT: There have been numerous efforts to develop creep-resistant materials strengthened by incoherent particles at high temperatures and stresses in response to future energy needs for steam turbines in thermal-power plants. However, the microstructural instability of the incoherent-particle-strengthened ferritic steels limits their application to temperatures below 900 K. Here, we report a novel ferritic alloy with the excellent creep resistance enhanced by coherent hierarchical precipitates, using the integrated experimental (transmission-electron microscopy/scanning-transmission-electron microscopy, in-situ neutron diffraction, and atom-probe tomography) and theoretical (crystal-plasticity finite-element modeling) approaches. This alloy is strengthened by nano-scaled L21-Ni2TiAl (Heusler pha

SUBMITTER: Song G 

PROVIDER: S-EPMC4637877 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature