Characteristics 上游充道大粤 SHANGHAI JIAO TONG UNIVERSITY 3.Orientation relationships and habit planes The formation of martensite involves the coordinated movement of atoms. Austenite and martensite lattices will be intimately related All martensite transformations therefore lead to a reproducible orientation relationship between the parent and product lattices. It is frequently the case that a pair of corresponding close- packed planes in the ferrite and austenite are parallel or nearly parallel,and it is usually the case that corresponding directions within these planes are roughly parallel. K.Chen 10K. Chen Characteristics 10 3. Orientation relationships and habit planes The formation of martensite involves the coordinated movement of atoms. Austenite and martensite lattices will be intimately related. All martensite transformations therefore lead to a reproducible orientation relationship between the parent and product lattices. It is frequently the case that a pair of corresponding close￾packed planes in the ferrite and austenite are parallel or nearly parallel, and it is usually the case that corresponding directions within these planes are roughly parallel