MICROSTRUCTURE OF DISSIMILAR JOINTS BETWEEN DUPLEX STAINLESS STEEL AND LOW ALLOYED STEEL

1 URLAN Sorin Dumitru
Co-authors:
2 KARANCSI Olimpiu 1 MITELEA Ion 1 BURCĂ Mircea
Institutions:
1 University Politehnica Timisoara, Pta Victoriei, no. 2, Timisoara, Romania, EU, sorinurlan@yahoo.com, ion.mitelea@upt.ro, mircea.burca@upt.ro
2 Victor Babes University of Medicine and Pharmacy Timisoara, Pta Eftimie Murgu no.2, Timişoara, Romania, EU, olimpiu.karancsi@dentalexpert.ro
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
997-1002
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
22 views / 4 downloads
Abstract

Extending the application area of Duplex stainless steels has led to the necessity of creating components or structures made of dissimilar materials. Due to the differences in the microstructure, the welding of the dissimilar steels is more difficult than that of similar steels.The research carried out in the current paper focuses on the particularities of completing the heterogeneous welded joints between a Duplex stainless steel and a Cr-Mo low alloy steel using as additional material an electrode wrapped in E 309MoL – 16, which contains approx. 23 % Cr, 12 % Ni and 2%Mo. The implementation of this welding technology focuses on eliminating the technological operations of preheating and post welding heat treatment, which is mandatory for welding low alloy steels sensitive to hardening through martensitic transformation and cold cracking respectively. Based on the Schäffler model a prediction of the metal microstructure deposited by welding is carried out and the quality of the joints made is carried out by metalographical investigations.

Keywords: Welding by melting, dissimilar steels, microstructure
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