Abstract
Gas tungsten arc (GTA) weldability of rolled CoCrFeMnNi high-entropy alloys (HEAs) was conducted using stainless steel (STS) 308L and HEA fillers. Microstructure and mechanical properties of the welds were examined to determine GTA weldability of the rolled HEA. The welds had no macro-defects, and component behaviour between base metal (BM) and weld metal (WM) showed significant differences in the weld using the STS 308L filler. Macro-segregation of Fe components was confirmed in the central region in the WM using the STS 308L filler. Because the columnar grain sizes of all the WMs were larger than those of the rolled HEA BM irrespective of the filler metals, the tensile properties of the GTA welds were lower than those of the rolled HEA BM, and the tensile fracture occurred in the centreline of each weld. In particular, the tensile properties of the weld using the STS 308L filler deteriorated more than those of the HEA weld. This was induced by the formation of macro-segregation and severe martensite transformation in the centreline of WM. To enhance the weldability of the rolled HEA, the formation of macro-segregation and coarse grains in the WM of GTA welds must be prevented.
Highlights
High-entropy alloys (HEAs) have been highlighted as structural materials for replacing conventional structural steel [1,2]
This study investigated gas tungsten arc (GTA) weldability using commercial stainless steel (STS) 308L and HEA
The fusion lines of the welds were clearly confirmed, irrespective of the fillers. These results show that when filler was melted, a part ofa the was properly melted, of the the fillers
Summary
High-entropy alloys (HEAs) have been highlighted as structural materials for replacing conventional structural steel [1,2]. CoCrFeMnNi equiatomic HEA, which is a face-centred cubic (FCC)-HEA, has demonstrated excellent cryogenic properties [7,8,9,10]. Owing to these advantages, considerable research is ongoing to improve the tensile and cryogenic properties of the base metal (BM) of HEAs [11,12,13,14]. This study investigated GTA weldability using commercial stainless steel (STS) 308L and HEA fillers on rolled CoCrFeMnNi HEAs. the microstructural and component behaviours due to the application of various fillers are discussed to understand the tensile properties of the welds
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have