Document Type

Article

Publication Date

4-2008

Journal or Book Title

Journal of Materials Engineering and Performance

Volume

17

Issue

2

First Page

234

Last Page

239

DOI

10.1007/s11665-007-9134-z

Abstract

The kinetics of brittle phase transformation in cast duplex stainless steels CD3MN and CD3MWCuN was investigated under continuous cooling conditions. Cooling rates slower than 5 °C/min. were obtained using a conventional tube furnace with a programable controller. In order to obtain controlled high cooling rates, a furnace equipped to grow crystals by means of the Bridgman method was used. Samples were soaked at 1100 °C for 30 min and cooled at different rates by changing the furnace position at various velocities. The velocity of the furnace movement was correlated to a continuous-cooling-temperature profile for the samples. Continuous-cooling-transformation (CCT) diagrams were constructed based on experimental observations through metallographic sample preparations and optical microscopy. These are compared to calculated diagrams derived from previously determined isothermal transformation diagrams. The theoretical calculations employed a modified Johnson-Mehl-Avrami (JMA) equation (or Avrami equation) under assumption of the additivity rule. Rockwell hardness tests were made to present the correlation between hardness change and the amount of brittle phases (determined by tint-etching to most likely be a combination of sigma + chi) after cooling.

Comments

This article is from Journal of Materials Engineering and Performance 17 (2008): 234-239, doi: 10.1007/s11665-007-9134-z. Posted with permission.

Rights

Copyright 2008] ASM International. This paper was published in Journal of Materials Engineering and Performance, Vol. 17, Issue 2, pp. 234-239 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.

Copyright Owner

ASM International

Language

en

File Format

application/pdf

Included in

Metallurgy Commons

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