Dispersions of Particles and Heat Resistance in a Cu-Fe-P Alloy
Kazuhisa Kita, Kazunori Kobayashi, Ryoichi Monzen
Abstract:The influence of dispersions of particles on the recrystallization behavior has been examined in industrially processed specimens of a Cu-Fe-P alloy (CDAL94). The specimens are produced through the steps of hot rolling, cold rolling, aging and final cold rolling. The g - a martensitic transformation of small coherent g-Fe precipitate particles which form on decreasing temperature during hot rolling is induced by subsequent cold rolling. Aging following the cold rolling produces fine g-Fe particles, which are transformed to a-Fe by final cold rolling. The nucleation of recrystallization occurs predominantly at coarse Fe3P particles, observed after the hot rolling, larger than about l mm in diameter. A denser dispersion of smaller a-Fe particles shows a larger retarding effect on grain-boundary migration. A specimen with smaller a-Fe and smaller Fe3P particles has a higher heat resistance and a higher strength. Key Words:Cu-Fe-P alloy, a-Fe particles, Fe3P particles, Nucleation of recrystallization, Grain-boundary pinning