Structural-phase state and cyclic life of high-chromium steel 40Kh13 processed by intense flows of nitrogen ions

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The effect of ion-beam nitriding at temperature 670 and 770 K on the structure, phase composition and cyclic durability (fatigue resistance) of high-chromium martensitic steel 40Kh13 is considered. It is shown that the nitrided layer on the steel treated at 670 K contains particles of nitride phases such as e-(Fe, Cr) 2-3N, g¢-(Fe, Cr) 4N, a²- (Fe, Cr) 8N and the solid solution of nitrogen in martensite. Treatment of the 40Kh13 steel at 770 K leads to formation of the nitrided layer containing CrN nitride particles. The occurrence of compressive stresses the nitrided layers is registered. The highest compressive stresses of 780 MPa are located in the steel 40Kh13 surface layer treated with nitrogen ions at 670 K. It was found that the steel processing by intensive flows of nitrogen ions effectively increases its’ micro-hardness and resistance to fatigue failure in the field of high-cycle fatigue. The most efficient increase in the number of cycles to failure is recorded after the nitrogen ion beam processing of the steel at 670 K. The fatigue resistance of the steel treated at 670 K increases up to 850 MPa. It is concluded that the cycle life is greatly influenced by the level of compressive stresses in the surface layers. The highest levels of compressive stress and cyclic durability is achieved by ion processing of the steel at 670 K, which provides both the formation of nitrides and a high concentration of dissolved nitrogen in the matrix phase.

About the authors

V. A Kukareko

The State Scientific Institution “Joint Institute of Mechanical Engineering of the National Academy of Sciences of Belarus”, Centre of Structural Research and Tribo-Mechanical Test of Materials

Email: v_kukareko@mail.ru
12, Akademicheskaya str., Minsk, 220072, Republic of Belarus

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