The Effect of Long-Term Ageing at 475 °C on Microstructure and Properties of a Precipitation Hardening MartensiticStainless Steel

The effect of long-term ageing (1000, 2000, and 3000 h) at 475 °C on mechanical properties, microstructure, substructure CUSTOM 465® maraging stainless steel was studied. additional precipitation nanometric particles ?-Ni3Ti phase in partly recovered lath martensite decomposition the BCC solid solution accompanied by formation Cr-rich ?’particles were identified. fraction reverted austenite final microstructure gradually increased with time °C. Ageing resulted a gradual slight decline (up to 10%) yield strength, ultimate tensile hardness. On other hand, for all ageing, dwells ductility impact energy values remained almost unchanged. reason this phenomenon lies increase during same sluggish kinetics microstructural changes martensite. No susceptibility embrittlement proved.