How To Use Martensite In A Sentence
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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).
Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86
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Martensite is a supersaturated solid solution of carbon in iron which has a body-centred tetragonal structure, a distorted form of bcc iron.
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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.
Machine Design -
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The decomposition and transformation of the retained austenite in bainite differ from that in martensite.
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Martensite is usually considered to be a solid solution of cementite in beta iron.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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Dual-phase steels, which feature hard martensite particles in a soft ductile ferrite matrix are also highly formable.
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During this heat treatment all of the austenite transforms to martensite.
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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.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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The ability of steel to form martensite on quenching is referred to as the hardenability.
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Any retained austenite in the steel microstructure can transform under mechanical loading to martensite with a resulting increase in volume.
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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.
Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86
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With hardening of steels, by chilling after previous heating, the structure is converted from austenite to martensite.
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The matrix microstructures resulting from heat treatment can vary from ferrite-pearlite to tempered martensite.
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The structure is then austenite and the air-cooled structure of this steel is martensite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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As compared with martensite-hardenable carbon-containing steels, carbonless maraging steels show, for the same strength, a substantially greater resistance to brittle fracture, which is their most remarkable merit.
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The engineers are running programs that show how adding tiny amounts of alloys to ferrite and martensite—crystalline structures of iron—during the steelmaking process changes the steel's strength, as well as its ability to be shaped into different parts.
Metal Firms Seek Weight Loss
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This toughness is the chief characteristic of the next material in the transformation series, sorbite, which is merely martensite wholly transformed into
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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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).
Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86
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The engineers are running programs that show how adding tiny amounts of alloys to ferrite and martensite—crystalline structures of iron—during the steelmaking process changes the steel's strength, as well as its ability to be shaped into different parts.
Metal Firms Seek Weight Loss
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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).
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Any retained austenite in the steel microstructure can transform under mechanical loading to martensite with a resulting increase in volume.
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This structure is called martensite and is desired when maximum hardness is essential.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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The results show that the microstructure of the alloys system is the compound of the acicular martensite and partial residual austenite. From the matrix, the composite carbides were precipitated.
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Trip steels have a microstructure with retained austenite, ferrite and martensite.
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The interface of austenite and martensite is somewhat straight.
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Troostite is of doubtful composition, but possibly is an unstable mixture of untransformed martensite with sorbite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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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).
Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86
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When cooled rapidly, however, as in the tempering of steel, martensite remains a homogeneous solid solution, or hard steel.
Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86
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Trip steels have a microstructure with retained austenite, ferrite and martensite.
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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.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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Trip steels have a microstructure with retained austenite, ferrite and martensite.
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Therefore, the content of low carbon martensite and volume fraction of undissolved carbide in the structure hardened files can he increased and their toughness and working life have bee...
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Fig.8 shows the structure of a steel hardened from 760°C, consisting of particles of cementite dispersed in a matrix of martensite.
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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
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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The martensite of quenched tool steel is exceedingly brittle and highly stressed.
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The results show that the microstructure of Fe-Si-Mn cast steels can be remarkably changed through magnetic field treatment, from a mixture structure to only one pearlite or martensite structure.
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The structure is then austenite and the air-cooled structure of this steel is martensite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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So when martensite volume fraction was 20%, forming property of DP steel was better than the DP steel whose martensite volume fraction was 30%.
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It is possible to quench similar steels from 1050°C to form a low carbon martensite or with lower carbon content, acicular ferrite followed by tempering to give higher properties.