Effect of solution treatment temperature on the precipitation kinetic of σ-phase in 2205 duplex stainless steel welds

被引：123
作者：
Badji, R. [1 ,3 ]
Bouabdallah, M. [2 ]
Bacroix, B. [1 ]
Kahloun, C. [1 ]
Bettahar, K. [3 ]
Kherrouba, N. [2 ]
机构：
[1] Univ Paris 13, LPMTM CNRS, UPR 9001, F-93430 Villetaneuse, France
[2] ENP, El Harrah Alger 16200, Algeria
[3] Welding & NDT Res Ctr, Algiers, Algeria
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 496卷 / 1-2期
关键词：
Duplex stainless steel; Welding; Ageing; Precipitation kinetic; Johnson-Mehi-Avrami model;
D O I：
10.1016/j.msea.2008.06.024
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of the prior solution treatment temperature on the delta-ferrite transformation in 2205 duplex stainless welds after aging at 850 degrees C has been studied. Microstructural examination showed that the sigma-phase and M23C6 chromium carbides precipitate at the delta/gamma interfaces and within the delta-ferrite grains. Increasing the solution treatment temperature from 1050 to 1250 degrees C delays the sigma-phase formation and favours the precipitation of intragranular secondary austenite gamma(2). The simulation of the sigma-phase precipitation kinetic in the base metal, HAZ and weld metal, indicates a good agreement between the experimental fitted data and the modified Johnson-Mehl-Avrami model. The results indicate a marked sensitivity of the sigma-phase precipitation kinetic to the solution treatment temperature. A high precipitation rate corresponds to a fine grained structure with ferrite enriched in sigma forming elements (Cr, Mo). (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：447 / 454
页数：8
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