Heat affected zone and weld metal analysis of HARDOX 450 and ferritic stainless steel double sided TIG-joints

Abstract

In this study, AISI 430 and HARDOX 450 grade steel are joined using a double-sided tungsten inert gas welding process. The microstructural properties of weld metal and HAZ were evaluated by optical microscopy, energy dispersive spectroscopy, electron back scatter diffraction, elemental mapping, and X-ray diffraction analysis. As the results showed, an increase in welding current caused a large increase in the heat input to the welding pool, the penetration depth and the bead size. AISI 430 steel with Cr and Ni mixed with HARDOX 450 created new phases in the weld metal such as Cr7C3, Cr3Ni3, C23C6, matensite, Cr1.36 Fe0.52. The quantity and compound of martensite and carbides depended on the welding heat output and cooling degree.

Hardox 450 Weld in Microstructural and Mechanical Approaches after Welding at Micro-Jet Cooling

“…In the heat affected zone, a structure of post-martensitic orientation with areas of bainite and troostite is visible. The observed microstructure is comparable to the structure presented in the literature [ 49 , 50 ]. The observation of the base material zone confirms that, after welding with micro-jet cooling, the material microstructure of the base material (BM) showed features characteristic of martensite and was not the tempered sorbite.…”

Evaluation of the Properties and Microstructure of Thick-Walled Welded Joint of Wear Resistant Materials

“…The research into the weldability of Hardox steel carried out so far concerned mainly the issues relating to the determination of the effect of the welding process parameters on the microstructure and mechanical properties of the joints produced, the effect of the filler metal on the properties of the joint and the ability to produce dissimilar joints, i.a. [ 7 , 10 , 11 , 13 , 14 , 15 , 16 , 17 , 18 ]. Technically, it is extremely important to be able to make dissimilar joints that allow these steels to be used in a number of structures [ 15 , 16 , 17 , 18 ].…”

“…[ 7 , 10 , 11 , 13 , 14 , 15 , 16 , 17 , 18 ]. Technically, it is extremely important to be able to make dissimilar joints that allow these steels to be used in a number of structures [ 15 , 16 , 17 , 18 ]. The welded joints of this type have to meet the required abrasion resistance criterion, and at the same time, they must have the relevant plasticity and toughness within the heat-affected zone (HAZ).…”