|About this Abstract
||Materials Science & Technology 2020
||Additive Manufacturing: Qualification and Certification
||Post-build Heat Treatment of Wire-arc Additive Manufactured 410 SS for Hardness Tuning
||Girish K. Padhy, Winston R Kam, Matthew A Willard, James D McGuffin-Cawley, Michael A Kottman, Bradley Barnhart, Badri K Narayanan
|On-Site Speaker (Planned)
||Girish K. Padhy
410 stainless steel has applications stemming from its hardenability, wear resistance, and corrosion resistance. Post-processing is often important to optimizing mechanical and corrosion properties. To fully realize the value of additive manufacturing with this alloy, an understanding of the influence of post-build heat treatment on, for example, hardness is necessary. In this study, samples excised from a Wire Arc Additive Manufactured 410 SS block, in as-deposited state and after tempering at various temperatures between 566-787 ᵒC and times between 1-8 h were tested for microhardness. Results indicated that average microhardness (200-380 HV) is independent of build position within each layer and through the stack of layers. By tempering, the microhardness averaged over all layers of the as-deposited block (371±63 HV) decreased by 17-44% and its variance was markedly reduced by 63-95%. Surprisingly, the hardness was only weakly dependent on tempering time, implying that tempering is sufficient after 1 h.