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- Title
Effects of the Treating Time on Microstructure and Erosion Corrosion Behavior of Salt-Bath-Nitrided 17-4PH Stainless Steel.
- Authors
Wang, Jun; Lin, Yuanhua; Li, Mingxing; Fan, Hongyuan; Zeng, Dezhi; Xiong, Ji
- Abstract
The effects of salt-bath nitriding time on the microstructure, microhardness, and erosion-corrosion behavior of nitrided 17-4PH stainless steel at 703 K (430 °C) were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and erosion-corrosion testing. The experimental results revealed that the microstructure and phase constituents of the nitrided surface alloy are highly process condition dependent. When 17-4PH stainless steel was subjected to complex salt-bathing nitriding, the main phase of the nitrided layer was expanded martensite ( α`), expanded austenite (S), CrN, FeN, and FeN. The thickness of nitrided layers increased with the treating time. The salt-bath nitriding improves effectively the surface hardness. The maximum values measured from the treated surface are observed to be 1100 HV for 40 hours approximately, which is about 3.5 times as hard as the untreated material (309 HV). Low-temperature nitriding can improve the erosion-corrosion resistance against two-phase flow. The sample nitrided for 4 hours has the best corrosion resistance.
- Subjects
NITRIDES; MICROSTRUCTURE; SALT bath furnaces; STAINLESS steel corrosion; METAL erosion; X-ray diffraction; SCANNING electron microscopy
- Publication
Metallurgical & Materials Transactions. Part B, 2013, Vol 44, Issue 4, p1010
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-013-9841-9