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Fatigue and Structural Changes of High Interstitial Stainless Austenitic Steels
Author(s) -
Berns H.,
Gavriljuk V.G.,
Nabiran N.,
Petrov Yu.N.,
Riedner S.,
Trophimova L.N.
Publication year - 2010
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200900142
Subject(s) - materials science , austenite , carbide , metallurgy , martensite , annealing (glass) , fatigue limit , ultimate tensile strength , work hardening , slip (aerodynamics) , hardening (computing) , dislocation , composite material , microstructure , physics , layer (electronics) , thermodynamics
Steels with 18 to 19 mass% Cr and Mn each were studied in the as‐cast condition containing 0.85 mass% C + N and in the elektro‐slag‐remelted and hot worked condition containing 0.96 mass% C + N after final solution annealing. The latter was also tested after 20% prestraining. The results of tensile tests were compared to those of rotating bending and push/pull loading. The higher C + N content raised the 0.2% proof strength to about 600 MPa of which 70% were retained as fatigue limit of rotating bending at 10 7 cycles and a failure probability of 50%. Prestraining further improved this limit but lowered it in relation to the proof strength. The structural components of cold work hardening under unidirectional loading and cyclic loading were similar (planar slip, dislocation, twins and ε ‐martensite) except for precipitates in the latter. Nitrides appeared in the austenite and carbides in the ε ‐plates.