Impact properties of high-nitrogen austenitic stainless steels

The Charpy v notch (CVN) impact properties of two kinds of high-nitrogen austenitic stainless steels (HNASS), Fe–24Mn–13Cr–1Ni–0.44N and Fe–24Mn–18Cr–3Ni–0.62N, were investigated at different temperatures. Results show that with the increase of nitrogen concentration, the absorbed-in-fracture energy decreases rapidly; microstructures, such as peeled off layer and transgranular brittle fracture facet (TBFF) are the features of brittle fracture of HNASSs when impacted at −190 °C. The transformation of fracture microstructures of them with the descending temperatures was also proposed.