The influence of initial heat treatment on anomalous Cr precipitation within high temperature solubility region in Fe-9Cr alloy has been investigated using positron lifetime studies. Air-quenched samples with pre-existing dislocations exhibited a distinct annealing stage in positron lifetime between 800 and 1100 K corresponding to Cr-precipitation. During this stage, Transmission Electron Microscopy showed fine precipitates of average size 4 nm, dispersed throughout the sample and from EDS analysis they are found to be Cr-enriched. The existence of dislocations is found to be responsible for Cr precipitation.
Cite
@article{arxiv.1105.5880,
title = {Dislocation Driven Chromium Precipitation in Fe-9Cr Binary Alloy: A Positron Lifetime Study},
author = {S. Hari Babu and R. Rajaraman and G. Amarendra and R. Govindaraj and N. P. Lalla and Arup Dasgupta and Gopal Bhalerao and C. S. Sundar},
journal= {arXiv preprint arXiv:1105.5880},
year = {2017}
}