Characterization of a Gas Tungsten Arc Welding (GTAW) joint of Armco iron nanostructured by equal-channel angular pressing (ECAP)
Visualitza/Obre
10.1016/j.jmatprotec.2020.116902
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/331601
Tipus de documentArticle
Data publicació2021-02
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
After Severe Plastic Deformation (SPD), the strength of the Armco iron sharply increases with the number of Equal-Channel Angular Pressing (ECAP) passes. So, the ultimate tensile stress (UTS) reached up to 800¿MPa after eight passes, reflecting an increment of around four times than the as-received material strength. The original grain size of the annealed iron of about 70 µm also experimented with drastic changes after ECAP, reaching grain sizes approaching to 300¿nm. Samples were then welded by the Gas Tungsten Arc Welding (GTAW) process varying the voltage and current conditions. Metallographic analysis by Light Optical Microscopy (LOM) and Electron Backscatter Diffraction (EBSD), was carried out to analyze the weld penetration, Fusion Zone (FZ), and the size and microstructure morphology across the Heat Affected Zone (HAZ). Special attention was given to microstructure changes of the nanostructured base metal. A microstructural gradient was observed throughout the welded joint with hardness reduction concerning the nanostructured material but still superior to the material without ECAP. The temperature heterogeneity gave rise to different grain sizes and morphologies like Widmanstätten ferrite around the FZ, especially at high heat inputs.
CitacióMejía Granados, I.; Cabrera, J. Characterization of a Gas Tungsten Arc Welding (GTAW) joint of Armco iron nanostructured by equal-channel angular pressing (ECAP). "Journal of materials processing technology", Febrer 2021, vol. 288, p. 116902:1-116902:12.
ISSN0924-0136
Versió de l'editorhttps://www.sciencedirect.com/science/article/abs/pii/S0924013620303162
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
pre proof.pdf | 3,972Mb | Visualitza/Obre |