Work on pearlite up to 1962 is briefly outlined and work on the crystallography of pearlite before 1984 is discussed. Studies of the heterophase boundaries in ferrous and non1errous pearlite by transmission electron microscopy over the past decade are introduced. The ‘ledge growth mechanism’ based on such studies is evaluated against the ‘classic’ view of pearlite growth. It is concluded that the hypothesis of the ledge growth mechanism offers a comprehensive explanation of pearlite phenomena and that the classic view fails to account for some features of pearlite. The implications of the new research on pearlite are addressed. The details of ledge motion and the velocity–spacing problem are discussed. The lack of work on the importance of crystallography on morphological evolution of pear lites is identified. Further work necessary to evaluate and advance the new understanding of pearlite is outlined.
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