This article is a pictorial representation of commonly observed microstructures in iron-base alloys (carbon and alloy steels, cast irons, tool steels, and stainless steels) that occur as a result of variations in chemical analysis and processing. It reviews a wide range of common and complex mixtures of constituents (single or combination of two phases) that are encountered in iron-base alloys and the complex structure that is observed in these microstructures. The single-phase constituents discussed in the article include austenite, ferrite, delta ferrite, cementite, various alloy carbides, graphite, martensite, and a variety of intermetallic phases, nitrides, and nonmetallic inclusions. The article further describes the two-phase constituents including, tempered martensite, pearlite, and bainite and nonmetallic inclusions in steel that consist of two or more phases.
George F. Vander Voort, Typical Microstructures of Iron-Base Alloys, Metals Handbook Desk Edition, 2nd ed., Edited By Joseph R. Davis, ASM International, 1998, p 1384–1394, https://doi.org/10.31399/asm.hb.mhde2.a0003246
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