Influence of Conventional Heat Treatment on Low Temperature Impact Toughness of Ni9 Steel
The influence of conventional parameters on microstructure and low temperature impact toughness of Ni9 steel at -196℃was studied, and the distribution ,shape of microstructure and low temperature impact fracture surface of Ni9 steel were researched by means of metallographic microscope,TEM and SEM. The results show that the effects of different quenching mediums on low temperature impact toughness of Ni9 steel are relatively small, but the influence of quenching temperature and tempering temperature on that is virtually.