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 

作者机构：Hybrid Additive Manufacturing LaboratoryMechanical Engineering DepartmentPDPM Indian Institute of Information TechnologyDesign&ManufacturingJabalpur482005Madhya PradeshIndia FFF LaboratoryMechanical Engineering DepartmentPDPM Indian Institute of Information TechnologyDesign&ManufacturingJabalpur482005Madhya PradeshIndia Department of Mechanical EngineeringNational Institute of TechnologySrinagarIndia 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2024年第38卷第8期

页      面：194-204页

核心收录：

学科分类：08[工学] 0826[工学-兵器科学与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

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

主　　题：Metal additive deposition Defence applications Arc-based DED Characterization Wear behaviour Fractography 

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.