Microstructure and mechanical properties of stainless steel clad plate welding joints by different welding processes

Abstract

This work aims to study the microstructure and mechanical properties of stainless steel/carbon steel clad plate joints with three welding types: welding without transition layer, welding with transition layer using tungsten inert gas arc welding and shielded metal arc welding, respectively. Both of transition layer-weld metals contain ferrite + austenite phases obtained by different solidification modes. The brittle martensite zone is formed in the stainless steel weld metal without the transition layer because of the excessive diffusion of Cr, Ni elements. The clad plate joints with transition layer welded by shielded metal arc welding achieved the best welding quality without excessive alloy element dilution or formation of brittle phase, which reveals a perfect welding joint without obvious hardness gradient and obtains outstanding mechanical properties.

Effect of TIG welding parameters on 316 L stainless steel joints using taguchi L27 approach

“…δ-Ferrite is found around austenite grain boundaries and inside its phase. As reported by Yu et al [33].…”

Influence of welding sequence on residual stress evolution in Incoloy825/X52 bimetallic clad plate butt-welded joints

“…Compared to the results with stress distribution contours, it can be determined that these high-stress areas do correspond to the transition layer and its surrounding area. According to previous studies [1-4], undesirable microstructures such as brittle martensite layers and type II boundaries always generate along with interfaces in transition layers. During the long service life of the BCP joint, the interfaces containing these microstructures are very likely to failure under high tensile stress [11].…”

“…As such, it has attracted much attention from researchers. Yu et al [2] pointed out that the BCP joint should be welded with a transition layer to avoid the generation of excessive alloy element dilution and the brittle phase in the welding seam. Li et al [3] noted that the use of mixed filling metals was more likely to induce the generation of brittle phase.…”

Review on the application of stainless-clad bimetallic steel in the marine environment

“…When stainless-clad bimetallic steels are used in ocean engineering, the welding performance is an important factor that must be considered (Zhu et al , 2021; Yu et al , 2020; Zappa et al , 2018; Zhao et al , 2021; Meng et al , 2019). Many high-efficiency preparation processes for SCBS have been developed; however, there are many key barriers to its welding and joining procedure for the microstructural deterioration and excessive internal stress between two component metals.…”

“…The shielded metal arc welding method was used to join composite plates with a transition layer. The welding quality was optimal, exhibiting no excessive dilution of alloying elements and the absence of brittle phases (Yu et al , 2020).…”