High strength combined with ductility is achieved by controlling the volume fraction of hard martensite islands within a soft ferrite matrix.
A technician counts the number of grid points that fall within the phase of interest (e.g., ferrite in duplex stainless steel or porosity in a casting). astm e562-19e1
Most people assume that if you want to know how much of a material is porosity, ferrite, or graphite, you’d use a computer. But ASTM E562-19e1 defends a deceptively simple, manual method: . It’s a testament to how systematic random sampling and basic statistics can outperform intuition—and even some automated systems—in metallography and materials science. High strength combined with ductility is achieved by
Do: