Observation

Abstract

E1㏄tron Microscope of the Pr㏄ess of Bainite Reaction hl an Fe−Ni−C AIloy（The Study on the M㏄hanisln of Bajhite Reaction II）． In order tQ clarify the pr㏄esses of bainite reaction， an carbon alloy， transformed for a short time at 3QO。C and 450。C isothermally and then quenched into water， was examined by transmission electron microscopy． The results are as follows：（1）The growing edge of the bainite plate is low carbon ferrite with lower dislocation density and with no precipitation in it． This fact supports the conclusion obtained by the same anthors in the preceding paper． （2）At 300。C plane faults parallel to ｛123｝αwere observed at the growing edge． These faults are considered to be formed due to the sidewise growth of b盆inite in the form of thin ferrite plates． Ribbon−shaped cementites nucleate at the e1ユds of these faults， with the habit plane tites first precipitate at the sides of ferrite plate directly from austenite． These cementite plates， paraHel to｛112｝α， are then converむed into rod−shaped cementites with a Iong axis parallel to the 〈111＞αdirection．（4）Selected area diffraction patterns show the same orientation relationship between ferrite and cementite as Pitsch−Schrader’s at 300Q and 450。C．