Evaluation of Tensile Strength and Microstructure of 304L Stainless Steel Deposited via Additive Friction Stir Deposition

Monday, September 12, 2022: 4:40 PM
Convention Center: 263 (Ernest N. Morial Convention Center)
H.M. Rao , University of Alabama, Tuscaloosa, AL
Mr. Malcolm Brady Williams , Baylor University, Waco, TX
C.J. Williamson , University of Alabama, Tuscaloosa, AL
N. Zahm , University of Alabama, Tuscaloosa, AL
Dr. Paul Allison , University of Alabama, Tuscaloosa, AL, University of Alabama, Tuscaloosa, AL
Dr. J.B. Jordon , University of Alabama, Tuscaloosa, AL, University of Alabama, Tuscaloosa, AL
Dr. Luke N. Brewer , University of Alabama, Tuscaloosa, AL
Dr. Vijay K. Vasudevan , University of Cincinnati, Cincinnati, OH
In this research, we study the feasibility of using additive friction stir deposition (AFSD) as a suitable technology for creating 304L stainless steel components. A 7-layer three-inch-long build was successfully deposited using AFSD. Specimens were extracted from the deposit to evaluate tensile strength and characterize microstructure evolution. The AFSD stainless steel deposit exhibited similar tensile properties to the wrought stainless steel plate. The AFSD stainless steel deposit also exhibited a uniform hardness throughout the base material and deposited layers. In addition, the AFSD deposit exhibited a highly refined, equiaxed grain structure compared to the base metal. Continuous bonding at the interface of 304L plate and deposited 304L layers was observed. However, oxides are noted at layer interfaces, causing diminished build direction mechanical performance. The present study indicates AFSD technology can be implemented for effective depositions of 304L stainless steel.
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