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

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.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
4819-4825
DOI
10.4028/www.scientific.net/MSF.539-543.4819
Citation
D.V. Edmonds, K. He, M. K. Miller, F.C. Rizzo, A. Clarke, D. K. Matlock, J. G. Speer, "Microstructural Features of 'Quenching and Partitioning': A New Martensitic Steel Heat Treatment", Materials Science Forum, Vols. 539-543, pp. 4819-4825, 2007
Online since
March 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Andrej Samoilov, Yuri Titovets, Nikolay Y. Zolotorevsky, Gottfried Hribernig, Andreas Pichler
Abstract:An experimental study of Fe-C-Mn-Cr low-carbon steels with varying Cr content is presented. Pronounced bay and a near-stasis behavior were...
311
Authors: Maria Jesus Santofimia, Lie Zhao, Yoshiki Takahama, Jilt Sietsma
Abstract:The quenching and partitioning (Q&P) process is a novel heat treatment for the development of advanced high strength steels that is raising...
3485
Authors: Yong Qing Ma, Yu Mei Dai, Yu Fen Liang, Xiao Jing Zhang
Chapter 2: Materials Science and Engineering
Abstract:The temper-resistance temperature of Cr-W-Mo-V high carbon medium alloy steels is in a range at 200°C-300°C. Along with increasing C and...
591
Authors: Peng Chen, Yun Bo Xu, Xiao Long Yang, Hong Liang Yi, Guo Dong Wang
Abstract:In this work, the bainite transformation during isothermality of aluminium bearing TRIP steel was studied by dilatometric experiment on a...
237
Authors: Artem Arlazarov, Melanie Ollat, Jean Philippe Masse, Magalie Bouzat
Chapter 2: Contributed Papers
Abstract:Q&P annealing cycles with different partitioning conditions were performed on cold rolled 0.2C-2.22Mn-1.44Si-0.21Cr steel. An important...
1420