（1. College of Materials Science and Engineering， Chongqing University， Chongqing 400044， China；
2. Institute of Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China）
Abstract： In order to explore the evolution of microstructure and properties of high nitrogen martensitic steel during tempering， the tempering treatment of 30Cr15Mo1N high nitrogen steel at different temperatures was carried out. The changes of microstructure and mechanical properties of high nitrogen steel during tempering were studied by OM， XRD， tensile， impact， SEM and TEM. The results show that after 30Cr15Mo1N steel is quenched after 1 h austenitizing at 1 030 ℃ and tempered twice at 150-700 ℃， with the increase of tempering temperature，the phase a matrix gradually recovers and recrystallizes in the microstructure，the body morphology gradually disappeared，and the carbonitrides first precipitated in the form of flakes or rods at the martensite slab boundary，and gradually evolved into a granular dispersion distribution. At 700 ℃，the carbonitride aggregates grow and spheroidize. As the tempering temperature increases，the matrix of 30Cr15Mo1N steel continues to soften，and the precipitation strengthening is continuously enhanced，resulting in less change in strength when tempered below 500 ℃. Based on the mechanical test，it is found that after tempering at 500 ℃，the strength is linear with increasing tempering temperature decline. With the increase of tempering temperature，the U-notch impact absorption of 30Cr15Mo1N steel is basically maintained at the level and then continues to rise. At last，it is concluded that the change of impact performance under different tempering temperatures is closely related to the change of strength and plasticity. The impact toughness is mainly determined by the plasticity.
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2019, Vol. 54 
