Analysis of the changes in microstructure, mechanical, and contact properties of multi-pass friction stir processed dp800 steel

Semih Mahmut Aktarer, Tevfik Küçükömeroğlu, Dursun Murat Sekban, Ecren Uzun Yaylaci, Murat Yaylaci, Mehmet Emin Özdemir and İrem Mirzaloglu

Abstract

In this study, the friction stir process (FSP), which can be successfully applied to plate-type materials, was applied to DP800 steel in a varying number of passes (1, 2, and 3 passes), and the effects of the FSP on the microstructure, hardness, and strength values of the steel were examined. In addition, the changes in the strength values after the FSP were transferred to the finite element (FEM) and artificial neural network (ANN) based contact problem models, and the changes in the contact stress and areas were determined comparatively. As a result of the examinations, it was determined that there were significant reductions in grain sizes in the microstructure compared to the pre-processed material at all pass numbers after FSP. As a result, the hardness and strength values of the steel increased after FSP. FEM and ANN analyses revealed that maximum contact stress values increased after FSP due to higher strength, while contact area values decreased proportionally.

Key Words

contact problem; DP800 steel; friction stir process; mechanical properties; microstructure

Address

Semih Mahmut Aktarer: Department of Automotive Technology, Recep Tayyip Erdogan University, 53020, Rize, Turkey Tevfik Küçükömeroğlu: Department of Mechanical Engineering, Karadeniz Technical University, 61100, Trabzon, Turkey Dursun Murat Sekban: Department of Marine Engineering Operations, Karadeniz Technical University, 61530, Trabzon, Turkey/ WMS Engineering Services Industry Trade Limited Company, 61080, Trabzon, Turkey Ecren Uzun Yaylaci: Faculty of Fisheries, Recep Tayyip Erdogan University, 53100, Rize, Turkey Murat Yaylaci: Department of Civil Engineering, Recep Tayyip Erdogan University, 53100, Rize, Turkey/ Faculty of Turgut Kiran Maritime, Recep Tayyip Erdogan University, 53900, Rize, Turkey/ Murat Yaylaci-Luzeri R&D Engineering Company, 53100, Rize, Turkey Mehmet Emin Özdemir: Department of Civil Engineering, Cankiri Karatekin University, 18100, Çankiri, Turkey İrem Mirzaloglu: Department of Civil Engineering, Recep Tayyip Erdogan University, 53100, Rize, Turkey

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