This structure is called martensite and is desired when maximum hardness is essential.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

In the ordinary practice of hardening steels, the quenching is not so drastic, and the transformation of austenite back to ferrite and cementite is more or less completely effected, giving rise to certain transitory forms which are known as "martensite," "troostite," "sorbite," and finally, pearlite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

When heated to 670 degrees, it becomes homogeneous, an amount of carbon up to two per cent. dissolves in the iron, and hard steel or martensite is formed.    From Wordnik.com.  [Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86] Reference

When cooled slowly below 670 degrees, martensite yields a heterogeneous mixture of pearlite and ferrite (or cementite, if the original mixture contained between 0.8 per cent. and two per cent. of carbon).    From Wordnik.com.  [Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86] Reference

This term is usually restricted to the formtion of martensite.    From Wordnik.com.  [MyLinkVault Newest Links] Reference

Steel with 0.2 per cent carbon and 15 per cent nickel is entirely martensite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

The structure is then austenite and the air-cooled structure of this steel is martensite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Austenite is not nearly as hard as martensite, owing to its content of the soft gamma iron.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

Slide 30: Figure 12.12 Retained austenite (white) trapped between martensite needles (black) ( 1000).    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Troostite is of doubtful composition, but possibly is an unstable mixture of untransformed martensite with sorbite.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

The Goldedge treatment process alters the molecular structure of the steel, converting the retained austenite to martensite.    From Wordnik.com.  [Manufacturingtalk - manufacturing industry news] Reference

Figure 12.26 (a) Surface hardening by localized heating. (b) Only the surface heats above the A1 temperature and is quenched to martensite.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

The microstructure of the steel is tempered martensite, and assume that you cannot estimate the composition of the steel from the structure.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

The structure shown is progressively white martensite, martensite and retained austenite, followed by martensite at approximately 700HV0. 3.    From Wordnik.com.  [Yahoo! Answers: Latest Questions] Reference

When heated to 670o, it becomes homogeneous, an amount of carbon up to two per cent. dissolves in the iron, and hard steel or martensite is formed.    From Wordnik.com.  [The Scientific Monthly, October-December 1915] Reference

Moderate reheating or annealing changes this structure largely into troostite, which is a partly transformed martensite, possessing much of the hardness of martensite, but with.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

In the most quickly quenched high carbon steels, austenite commonly forms the ground mass which is interspersed with martensite, a large field of which is illustrated in Fig. 50.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

This portion of the presentation will include an explanation of the transformation behavior involved with memory martensite in Nitinol wire, which is a common stent and dental metal.    From Wordnik.com.  [R&D Mag - News] Reference

With about 0.2 per cent carbon and 8 per cent nickel, the steel is nearing the stage between pearlite and martensite, and the structure is extremely fine, the ferrite and pearlite having.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

 Marquenching - Quenching austenite to a temperature just above the MS and holding until the temperature is equalized throughout the steel before further cooling to produce martensite.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Slide 8: Figure 12.3 Electron micrographs of (a) pearlite, (b) bainite, and (c) tempered martensite, illustrating the differences in cementite size and shape among these three microconstituents ( 7500).    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Slide 27: Section 12.4 Quench and Temper Heat Treatments  Retained austenite - Austenite that is unable to transform into martensite during quenching because of the volume expansion associated with the reaction.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

At faster cooling rates, however, the microstructure almost fully transforms into martensite; increasing from approximately 15\% martensite, 85\% bainite / pearlite to 87\% martensite, 13\% bainite / pearlite at the highest cooling rate, based on a point-count method.    From Wordnik.com.  [Machine Design -] Reference

Cementite is a definite compound of iron and carbon represented by the formula Fe 3 C. When cooled slowly below 670o, martensite yields a heterogeneous mixture of pearlite and ferrite (or cementite, if the original mixture contained between 0.8 per cent. and two per cent. of carbon).    From Wordnik.com.  [The Scientific Monthly, October-December 1915] Reference

A very pronounced tendency to mimic a purely martensite structure.    From Wordnik.com.  [The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel] Reference

The appearance of white martensite is caused by extremely rapid quench rates. ".    From Wordnik.com.  [Yahoo! Answers: Latest Questions] Reference