期刊论文详细信息
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 卷:703
Influence of simultaneous aging and plasma nitriding on fatigue performance of 17-4 PH stainless steel
Article
Riazi, Hamidreza1  Ashrafizadeh, Fakhreddin1  Hosseini, Sayed Rahman2  Ghomashchi, Reza3 
[1] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran
[2] Maleke Ashtar Univ Technol, Dept Mat Engn, Esfahan 83145115, Iran
[3] Univ Adelaide, Sch Mech Engn, Adelaide, SA 5005, Australia
关键词: Stainless steel;    17-4 PH;    Fatigue strength;    Plasma nitriding;    Age hardening;   
DOI  :  10.1016/j.msea.2017.07.070
来源: Elsevier
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【 摘 要 】

This paper investigates fatigue behavior of precipitation hardenable 17-4 PH stainless steel after simultaneous aging and plasma nitriding. For this purpose, solution treated, aged and simultaneous aged and nitrided specimens were compared in terms of hardness, phase analysis, residual stress and fatigue strength. Hardness values of aged specimens were recorded during aging process to find the optimum condition in terms of time and temperature for plasma nitriding at which specimens can be simultaneously nitrided and aged. Plasma nitrided specimens were analyzed for residual stresses, and its effect on mechanical properties including hardness and fatigue strength. The specimens that were plasma nitrided at lower temperatures had the highest core hardness. Increasing the nitriding temperature/time caused an increase in residual stress and, consequently, a higher surface hardness. Both nitriding and aging processes improved fatigue life by more than 40%. Plasma nitriding imparts beneficial effect mainly during high stress fatigue while aging treatment is more effective on low stress fatigue properties. Specimens nitrided at 500 degrees C for 5 h experienced longer fatigue life for high stress conditions while specimen aged/nitrided at 400 degrees C for 10 h exhibited the highest fatigue strength.

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