Titre :

Effect of post-weld heat treatment onthermal diffusivity in UNS S32304 duplexstainless steel welds

Auteur(s) :

Betini, Evandro Giuseppe [Auteur]
Instituto de Pesquisas Energéticas e Nucleares [São Paulo] [IPEN/CNEN-SP]
Mucsi, Cristiano Stefano [Auteur]
Instituto de Pesquisas Energéticas e Nucleares [São Paulo] [IPEN/CNEN-SP]
Luz, Temistocles de Sousa [Auteur]
Federal Institute of Education, Science and Technology of Espírito Santo [IFES]
Orlando, Marco T.D. [Auteur]
Federal Institute of Education, Science and Technology of Espírito Santo [IFES]
Avettand-Fènoël, Marie-NoËlle [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Rossi, Jesualdo L. [Auteur]
Instituto de Pesquisas Energéticas e Nucleares [São Paulo] [IPEN/CNEN-SP]

Titre de la revue :

Archives of Materials Science and Engineering

Numéro :

88

Pagination :

49-58

Éditeur :

Index Copernicus

Date de publication :

2017-12-01

ISSN :

1897-2764

Mot(s)-clé(s) en anglais :

Thermal diffusivity
Duplex steel
GTA welding
Post-weld heat treatment
Thin plate

Discipline(s) HAL :

Chimie/Matériaux

Résumé en anglais : [en]

Purpose: The thermal diffusivity variation of UNS S32304 duplex stainless steel welds was studied after pulsed GTA welding autogenous process without filler addition. This property was measured in the transverse section ...
Lire la suite >Purpose: The thermal diffusivity variation of UNS S32304 duplex stainless steel welds was studied after pulsed GTA welding autogenous process without filler addition. This property was measured in the transverse section of thin plates after welding process and post-heat treated at 750°C for 8 h followed by air-cooling. Design/methodology/approach: The present work reports measurements of thermal diffusivity using the laser-flash method. The thermal cycles of welding were acquired during welding by means of k-type thermocouples in regions near the weld joint. The used shielding gas was pure argon and 98% argon plus 2% of nitrogen. The temperature profiles were obtained using a digital data acquisition system. Findings: It was found an increase of thermal diffusivity after welding process and a decrease of these values after the heat treatment regarding the solidified weld pool zone, irrespective of the welding protection atmosphere. The microstructure was characterized and an increase of austenite phase in the solidified and heat-affected zones was observed for post-weld heat-treated samples. Research limitations/implications: It suggests more investigation and new measurements about the influence of the shielding gas variation on thermal diffusivity in the heat-affected zone. Practical implications: The nuclear industry, especially, requests alloys with high thermal stability in pipes for power generation systems and safe transportation equipment’s for radioactive material. Thus, the duplex stainless steel grades have improved this stability over standard grades and potentially increase the upper service temperature reliability of the equipment. Originality/value: After heat treatment, the welded plate with 98%Ar plus 2%N2 as shielding gas presented a thermal diffusivity closer to the as received sample. By means of 2%-nitrogen addition in shielding gas during GTAW welding of duplex stainless steel may facilitate austenite phase reformation, and then promotes stability on the thermal diffusivity of duplex stainless steels alloys.Lire moins >

Langue :

Anglais

Audience :

Non spécifiée

Établissement(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Date de dépôt :

2021-04-12T16:23:42Z
2021-04-13T12:32:39Z