Abstract
Manganese-based alloys of Mn-Cu, Mn-Cr-Ni, Mn-Cr-Ni-Cu and Mn-Al-Cu systems were examined in connection with the hot- and cold-workability by forging and rolling.
Addition of copper more than 5 atomic percent improved the cold workability in a variety of the alloy systems used. The most desirable alloying to increase the workability was the simultaneous addition of nickel and copper. Delta-ferritic phase appeared in the systems with chromium, i.e., Mn-Cr-Ni and Mn-Cr-Ni-Cu alloys. The increase in the volume fraction of the phase lowered the workability particularly in the cold rolling, although the volume fraction could be controlled to some extent by heat treatments and modification of alloying compositions. Simultaneous addition of nickel and chromium was superior to a single addition of them for the improvement of the workability.
It was found that the manganese-based alloys with excellent workability were obtained by the addition of chromium, nikel and copper as well as that of aluminium and copper.
