Microstructural inhomogeneity of phase composition and grain structure in electron beam wire-feed additive manufactured AISI 304 stainless steel

2019 ◽  
Author(s):  
Marina Yu. Panchenko ◽  
Galina G. Maier ◽  
Valentina A. Moskvina ◽  
Evgenii V. Melnikov ◽  
Sergey V. Astafurov ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Electron Beam ◽  
Phase Composition ◽  
Grain Structure ◽  
304 Stainless Steel ◽  
Feed Additive ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Microstructural Inhomogeneity ◽  
Wire Feed

Effects of post-weld heat treatments on the microstructure, mechanical and corrosion properties of gas metal arc welded 304 stainless steel

2020 ◽  
Vol 17 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Taiwo Ebenezer Abioye ◽  
Igbekele Samson Omotehinse ◽  
Isiaka Oluwole Oladele ◽  
Temitope Olumide Olugbade ◽  
Tunde Isaac Ogedengbe
Keyword(s):  
Stainless Steel ◽  
Welded Joint ◽  
Grain Structure ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Corrosion Properties ◽  
Aisi 304 ◽  
Content Type ◽  
Post Annealing ◽  
Weld Heat

Purpose The purpose of this study is to determine the effects of post-annealing and post-tempering processes on the microstructure, mechanical properties and corrosion resistance of the AISI 304 stainless steel gas metal arc weldment. Design/methodology/approach Gas metal arc welding of AISI 304 stainless steel was carried out at an optimized processing condition. Thereafter, post-annealing and post-tempering processes were performed on the weldment. The microstructure, mechanical and electrochemical corrosion properties of the post-weld heat treated samples, as compared with the as-welded, were investigated. Findings The as-welded joint was characterized with sub-granular grain structure, martensite formation and Cr-rich carbides precipitates. This made it harder than the post-annealed and post-tempered joints. Because of slower cooling in the furnace, the post-annealed joint contained Cr-rich carbides precipitates. However, the microstructure of the post-tempered joint is more refined and significantly devoid of the carbide precipitates. Post-tempering process improved the elongation (∼23%), tensile (∼10%) and impact (∼31%) strengths of the gas metal arc AISI 304 stainless steel weldment, while post-annealing process improved the elongation (∼20%) and impact strength (∼72%). Owing to the refined grain structure and significant elimination of the Cr-rich carbide precipitates at the joint, the post-tempered joint exhibited better corrosion resistance in 3.5 Wt.% NaCl solution than the post-annealed and the as-welded joints. Originality/value The appropriate post-weld heat treatment that enhances microstructural homogeneity and quality of the AISI 304 gas metal arc welded joint was determined.

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