Influence of Austenitizing Heat Treatment on Properties of the Tempered 410-1Mo Type Stainless Steels

The modified 410-1Mo stainless steels has been developed with higher tensile strength and elongation compared to the standard 410 stainless steels. This paper reports the influence of austenitising temperature on microstructure, hardness, impact resistance and corrosion resistance of the modified 410-1Mo steels. The steels samples were prepared by a process sequence of induction melting, hot forging, annealing, hardening and tempering. The microstructure of the tempered steels revealed additional phase of delta ferrite at pre-austenitizing temperature 950 to1050oC and disappeared at temperature 1100oC. The steels with pre-austenitizing at 1100oC showed largest sized of lath martensite and largest amount of retained austenite. The tempered steels maintained hardness at austenitising temperature 950oC to 1000oC and showed increasing hardness at austenitising temperature from 1000 to 1100oC. At a range of austenitising temperature investigated the steels exhibited higher impact resistance at 1050oC. The tempered steels pre-austenitised at 950oC and 1100oC showed lowest pitting potential due to the existence of carbides and coarse-high carbon martensite, respectively. ICAMST 2016 (Materials Science and Engineering, Institute of Physics (IoP) Conference series)