This paper explores the consequences of applying an ultrasonic vibration-assisted ball burnishing process and its non-vibration assisted version on topology subsurface microstructure a transformation-induced plasticity AISI 301LN alloy. More specifically, four different metallographic conditions provided as 1.5-mm thickness sheets characterized by starting martensite content (3, 10, 20 40 wt.%)...

Abstract A new steel chemical composition is combined with a press hardening process, in which die-quenching interrupted by opening the forming tool to permit slow cooling of hot formed part through anisothermal bainitic ferrite transformation. This promotes carbon partitioning austenite before re-closed and resumed near-ambient temperature. The final microstructure predominantly dispersions ma...