Statistical Characterization of Wire and Arc Additive Manufactured Stainless Steel 304: Microstructure and Fatigue  
Author Jerard V. Gordon


Co-Author(s) D. Gary Harlow


Abstract Wire and arc additive manufacturing was used for deposition of stainless steel 304 to build single bead walls. The objective is to statistically characterize critical material properties of the build to make comparisons with wrought material. The quality of the build is demonstrated by the size distribution of porosity in the build. Due to variations in the thermal history as the vertical height of the build increases, material properties and their location dependence are evaluated. The difference in the material behavior along the direction of the build compared to perpendicular to the build is significant. Optical microscopy and electron back-scatter diffraction are used to estimate key geometric properties of grains. Fatigue crack growth experiments have been conducted to evaluate the effect of the build process, the location dependence, and residual stresses. A preliminary investigation for fatigue life behavior is discussed.


Keywords Additive manufacturing, Fatigue, Fatigue crack growth, Grain geometry, Porosity, Weibull distribution
    Article #:  2411
Proceedings ISSAT International Conference on Reliability and Quality in Design 2018
August 2-4, 2018 - Toronto, Ontario, Canada