Paper Title:
Promoting Isothermal Martensite Formation by High Temperature Heat Treatments in a Precipitation Hardening Austenitic Stainless Steel
  Abstract

This work investigates what phase transformations are taking place during a continuous heating as well as the influence of the solution temperature on the isothermal formation of martensite in a precipitation hardening semi-austenitic stainless steel. In previous studies in the stainless steel under investigation (12Cr-9Ni-4Mo-2Cu) only the isothermal mode of martensitic transformation has been experimentally detected. In this work it is shown that: 1) The AF temperature is located around 1040 K; 2) The χ-phase present in the initial microstructure dissolves above ~1323 K; 3) above 1448 K the formation of delta ferrite is promoted at austenite grain boundaries; 4) the kinetics of isothermal martensite formation is strongly accelerated with increasing solution temperature. The kinetics has been monitored in-situ at room temperature by using high resolution dilatometry. A semi-empirical dilatometry model is used to convert the dilatometry signal into volume fraction of martensite transformed. The results are briefly compared with previous kinetic measurements under the influence of strong magnetic fields.

  Info
Periodical
Solid State Phenomena (Volumes 172-174)
Edited by
Yves Bréchet, Emmanuel Clouet, Alexis Deschamps, Alphonse Finel and Frédéric Soisson
Pages
166-171
DOI
10.4028/www.scientific.net/SSP.172-174.166
Citation
D. San Martín, C. García-Mateo, "Promoting Isothermal Martensite Formation by High Temperature Heat Treatments in a Precipitation Hardening Austenitic Stainless Steel", Solid State Phenomena, Vols. 172-174, pp. 166-171, 2011
Online since
June 2011
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: M.S. Koo, Ping Guang Xu, J.H. Li, Yo Tomota, O. Muransky, Petr Lukáš, Yoshitaka Adachi
Abstract:A challenge was made to examine the micro-structural evolution during thermomechanically controlled processing (TMCP) by in situ neutron...
419
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: Kumkum Banerjee, Michel Perez, Matthias Militzer
Abstract:Non-isothermal austenite grain growth kinetics under the influence of several combinations of Nb, Ti and Mo containing complex precipitates...
809
Authors: Angelo Fernando Padilha, D.J.M. Aguiar, R.L. Plaut
Abstract:During processing or use, duplex stainless steels are subject to a great number of significant phase transformations, such as solidification,...
163
Authors: Jin Ming Liu, Jie Liu, Guang Wei Fan, Dong Fang Du, Guo Ping Li, Cheng Jun Chai
A. Environment Related Materials and Photocatalysts
Abstract:Effect of solution treated temperature at 5001100°C on ferrite/austenite ratio and σ phase precipitation has been studied in this paper, and...
3