Study on the Mechanical Behavior of Quenching and Partitioning Sheet Steel and Its Application to Stamping of a Hinge Pillar Inner Panel

This paper describes investigation of theeffect of heat generation during plastic deformationespeciallythe emergence phenomenon of the lüders band.During this process isenergyemitted into the environment as a heat and one of the best ways how to log whole process of deformation is infraredthermovision. In order to analyze those effects of quite small temperature increasehas been used infrared technique using combination ofhighsensitivitywith highframing frequency. As specimen was used sheet steel with high strength on the mechanical behavior during test on loading machine.

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Effect of Ni addition on the mechanical behavior of quenching and partitioning (Q&P) steel

Materials Science and Engineering A ◽

10.1016/j.msea.2017.05.030 ◽

2017 ◽

Vol 698 ◽

pp. 183-190 ◽

Cited By ~ 19

Author(s):

Kibum Kim ◽

Seok-Jae Lee

Keyword(s):

Mechanical Behavior ◽

Quenching And Partitioning ◽

Ni Addition

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Microstructural Features of 'Quenching and Partitioning': A New Martensitic Steel Heat Treatment

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.4819 ◽

2007 ◽

Vol 539-543 ◽

pp. 4819-4825 ◽

Cited By ~ 30

Author(s):

D.V. Edmonds ◽

K. He ◽

Michael K. Miller ◽

F.C. Rizzo ◽

A. Clarke ◽

...

Keyword(s):

Heat Treatment ◽

Sheet Steel ◽

Atom Probe ◽

Carbide Precipitation ◽

Martensite Phase ◽

Quenching And Partitioning ◽

Transmission Electron ◽

Quench Temperature ◽

Untransformed Austenite ◽

Quenching And Tempering

The microstructure following a new martensite heat treatment has been examined, principally by high-resolution microanalytical transmission electron microscopy and by atom probe tomography. The new process involves quenching to a temperature between the martensite-start (Ms) and martensite-finish (Mf) temperatures, followed by ageing either at or above, the initial quench temperature, whereupon carbon can partition from the supersaturated martensite phase to the untransformed austenite phase. Thus the treatment has been termed ‘Quenching and Partitioning’ (Q&P). The carbon must be protected from competing reactions, primarily carbide precipitation, during the first quench and partitioning steps, thus enabling the untransformed austenite to be enriched in carbon and largely stabilised against further decomposition to martensite upon final quenching to room temperature. This microstructural objective is almost directly opposed to conventional quenching and tempering of martensite, which seeks to eliminate retained austenite and where carbon supersaturation is relieved by carbide precipitation. This study focuses upon a steel composition representative of a TRIP-assisted sheet steel. The Q&P microstructure is characterised, paying particular attention to the prospect for controlling or suppressing carbide precipitation by alloying, through examination of the carbide precipitation that occurs.

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