Microstructure and Mechanical Properties of MAG Welded Joints of Hardox 400 Steels

ÇALIK A., UÇAR N.

Metal Science and Heat Treatment, cilt.67, sa.3-4, ss.264-268, 2025 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 67 Sayı: 3-4
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1007/s11041-025-01157-y
  • Dergi Adı: Metal Science and Heat Treatment
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex
  • Sayfa Sayıları: ss.264-268
  • Anahtar Kelimeler: hardness, Hardox steel (18KhGT), HAZ, impact energy, MAG welding, microstructure, tensile mechanical properties
  • Isparta Uygulamalı Bilimler Üniversitesi Adresli: Evet

Özet

The microstructure and mechanical properties of welded joints of Hardox 400 (18KhGT) steel obtained by MAG (metal active gas) welding are studied. Steel ER 120 SG (Mn3Ni2CrMo) welding wire with diameter 1.2 mm is used for the welding. Static tensile tests of the welded joints show that cracks occur outside the weld metal zone, and the tensile strength and the impact energy are higher compared to the base metal. The highest hardness of 407 HV is observed in the weld metal area mainly due to the presence of martensitic structure. Then the hardness decreases consistently in the direction to the heat-affected zone and the base metal.