nonpearlitic
Nonpearlitic is a term used in metallurgy and materials science to describe iron-carbon alloys, especially steel, that do not display a pearlite microstructure. Pearlite is a lamellar mixture of ferrite and cementite formed when austenite transforms during slow cooling. A nonpearlitic steel therefore lacks the characteristic lamellar arrangement of ferrite and cementite and instead exhibits other microstructures.
Common nonpearlitic microstructures include ferrite, bainite, martensite, tempered martensite, and various forms of austenite or spheroidized
In metallography, nonpearlitic regions are identified by the absence of the alternating ferrite–cementite lamellae that define
The term is descriptive rather than a formal material class; many steels may be described as nonpearlitic