A study was carried out on the impact toughness of Fe-Cr-X damping all
oys. Two measures proved to be effective in improving impact toughness
. One was to lower carbon plus nitrogen content to an ultra-low level.
This method is suitable for single-phase ferrite alloy. The other is
to use dual-phase damping alloys, The presence of martensite in Fe-Cr-
X alloys can enhance impact toughness remarkably, but lower damping ca
pacity drastically. This shows the importance of achieving balance bet
ween mechanical properties and damping capacity by properly controllin
g martensite volume fraction in dual-phase alloys.