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Metals 2018, 8(1), 72; https://doi.org/10.3390/met8010072

Comparing the Structure and Mechanical Properties of Welds on Ductile Cast Iron (700 MPa) under Different Heat Treatment Conditions

1
ISEP—School of Engineering, Polytechnic of Porto, 4200-465 Porto, Portugal
2
Campus de Cornélio Procópio, UTFPR—Universidade Tecnológica Federal do Paraná, Cornélio Procópio—PR 86300-000, Brazil
3
Georg Fischer Automotive A.G., 8200 Schaffhausen, Switzerland
*
Author to whom correspondence should be addressed.
Received: 26 December 2017 / Revised: 16 January 2018 / Accepted: 17 January 2018 / Published: 19 January 2018
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Abstract

The weldability of ductile iron, as widely known, is relatively poor, essentially due to its typical carbon equivalent value. The present study was developed surrounding the heat treatability of welded joints made with a high strength ductile cast iron detaining an ultimate tensile strength of 700 MPa, and aims to determine which heat treatment procedures promote the best results, in terms of microstructure and mechanical properties. These types of alloys are suitable for the automotive industry, as they allow engineers to reduce the thickness of parts while maintaining mechanical strength, decreasing the global weight of vehicles and providing a path for more sustainable development. The results allow us to conclude that heat treatment methodology has a large impact on the mechanical properties of welded joints created from the study material. However, the thermal cycles suffered during welding promote the formation of ledeburite areas near the weld joint. This situation could possibly be dealt through the implementation of post-welding heat treatments (PWHT) with specific parameters. In contrast to a ductile cast iron tested in a previous work, the bull-eye ductile cast iron with 700 MPa ultimate tensile strength presented better results during the post-welding heat treatment than during preheating. View Full-Text
Keywords: weldability; ductile cast iron; welding; heat affected zone; cracks; microstructure; preheating; post-welding heat treatment (PWHT); bull-eye structure weldability; ductile cast iron; welding; heat affected zone; cracks; microstructure; preheating; post-welding heat treatment (PWHT); bull-eye structure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gouveia, R.M.; Silva, F.J.G.; Paiva, O.C.; De Fátima Andrade, M.; Pereira, L.A.; Moselli, P.C.; Papis, K.J.M. Comparing the Structure and Mechanical Properties of Welds on Ductile Cast Iron (700 MPa) under Different Heat Treatment Conditions. Metals 2018, 8, 72.

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