Microstructure transformations and improving wear resistance of austenitic stainless steel additively fabricated by arc-based DED process  

作　　者：Ashish Yadav Manu Srivastava Prashant K.Jain Sandeep Rathee 

机构地区：[1]Hybrid Additive Manufacturing Laboratory,Mechanical Engineering Department,PDPM Indian Institute of Information Technology,Design&Manufacturing,Jabalpur,482005,Madhya Pradesh,India [2]FFF Laboratory,Mechanical Engineering Department,PDPM Indian Institute of Information Technology,Design&Manufacturing,Jabalpur,482005,Madhya Pradesh,India [3]Department of Mechanical Engineering,National Institute of Technology,Srinagar,India

出　　处：《Defence Technology（防务技术）》2024年第8期194-204,共11页Defence Technology

基　　金：Science&Engineering Research Board(SERB),DST,for its financial assistance received from the project(vide sanction order no.SPG/2021/003383)。

摘　　要：In this study, austenitic stainless steel(ASS) was additively fabricated by an arc-based direct energy deposition(DED) technique. Macrostructure, microstructure, mechanical characteristics at different spatial orientations(0°, 90°, and 45°), and wear characteristics were evaluated at the deposited structure top, middle, and bottom regions. Results show that austenite(γ) and delta-ferrite(δ) phases make up most of the microstructure of additively fabricated SS316LSi steel. Within γ matrix, δ phase is dispersed both(within and along) grain boundaries, exhibiting a fine vermicular morphology. The bottom, middle,and top regions of WAAM deposited ASS exhibit similar values to those of wrought SS316L in the tensile and impact test findings. Notably, a drop in hardness values is observed as build height increases. During SEM examinations of fractured surfaces from tensile specimen, closed dimples were observed, indicating good ductility of as-built structure. Wear test findings show signs of mild oxidation and usual adhesive wear. By depositing a mechanically mixed composite layer, an increase in the oxidation percentage was discovered to facilitate healing of worn surfaces. The findings of this study will help in design, production and renovation of products/components that are prone to wear. WAAM-deposited ASS has remarkable strength and ability to withstand impacts;it can be used in the production of armour plates for defence applications, mainly military vehicles and aircraft.

关 键 词：Metal additive deposition Defence applications Arc-based DED Characterization Wear behaviour FRACTOGRAPHY 

分 类 号：TJ04[兵器科学与技术—兵器发射理论与技术] TG142.71[一般工业技术—材料科学与工程]