Abstract：In order to further improve the strength and toughness and excellent corrosion resistance of super martensitic stainless steel,two new super martensitic stainless steels with nitrogen of 0.35% and manganese of 0.4% and 2.0%(mass percent) were developed and prepared under laboratory conditions,which are processed by quenching and partitioning process; The microstructure and mechanical properties of the steel were characterized by universal testing machine,optical microscope,scanning electron microscope,transmission electron microscope and electron backscattering diffraction. The results show that the mechanical properties of the two kinds of test steels are significantly improved compared with that of typical super martensitic stainless steels after quenching and partitioning. At the same time,it is found that manganese has a significant influence on the strength and toughness of the test steel. When the mass percent of manganese increases from 0.4% to 2.0%,the tensile strength and elongation of the test steel change from 1 690 MPa and 15.2% to 1 215 MPa and 35.1%,respectively,which both break the strength and toughness indexes of traditional super martensitic stainless steel. It is concluded that the reason for the significant improvement of strength and toughness is that the retained austenite content increases significantly after quenching and partitioning due to the synergistic effect of nitrogen and manganese,which is also caused by the precipitation of nano-scale reversed austenite and nitride.
庞阳, 邹德宁, 吕香, 李苗苗, 闫星宇. 锰对高氮超级马氏体不锈钢组织与性能的影响[J]. 钢铁, 2021, 56(3): 34-40.
PANG Yang, ZOU De-ning, LÜ Xiang, LI Miao-miao, YAN Xing-yu. Effect of manganese on microstructure and properties of high nitrogen super martensitic stainless steel[J]. Iron and Steel, 2021, 56(3): 34-40.
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2021, Vol. 56 
