Publication

On the origin of cementite diffraction peak broadening during tensile deformation at ambient temperatures

Helena Van Swygenhoven, Steven Van Petegem
2015
Journal Articles

Abstract

We report on the diffraction peak shape evolution from cementite particles in three steel microstructures, recorded during in-situ tensile deformation at room temperature. We demonstrate that in a bainitic tempered steel the observed peak broadening and asymmetry of cementite is a purely elastic effect, related to the heterogeneity of the microstructure. This result warns against the indiscriminate use of peak profile analysis to derive information on plastic deformation in cementite. (C) 2014 Elsevier Ltd. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/7331ff3d-d351-425b-925d-444a9700978c

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Helena Van Swygenhoven, Steven Van Petegem
2015
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/7331ff3d-d351-425b-925d-444a9700978c

About this result

Related concepts (32)

Bainite

Bainite is a plate-like microstructure that forms in steels at temperatures of 125–550 °C (depending on alloy content). First described by E. S. Davenport and Edgar Bain, it is one of the products that may form when austenite (the face-centered cubic crystal structure of iron) is cooled past a temperature where it is no longer thermodynamically stable with respect to ferrite, cementite, or ferrite and cementite. Davenport and Bain originally described the microstructure as being similar in appearance to tempered martensite.

Austenite

Austenite, also known as gamma-phase iron (γ-Fe), is a metallic, non-magnetic allotrope of iron or a solid solution of iron with an alloying element. In plain-carbon steel, austenite exists above the critical eutectoid temperature of 1000 K (727 °C); other alloys of steel have different eutectoid temperatures. The austenite allotrope is named after Sir William Chandler Roberts-Austen (1843–1902); it exists at room temperature in some stainless steels due to the presence of nickel stabilizing the austenite at lower temperatures.

Creep (deformation)

In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods and generally increase as they near their melting point. The rate of deformation is a function of the material's properties, exposure time, exposure temperature and the applied structural load.

Related publications (32)

On the origin of cementite diffraction peak broadening during tensile deformation at ambient temperatures

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