Cracking due to Cu and Ni segregation in a 17-4 PH stainless steel piston rod |
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| Affiliation: | 1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. Key Laboratory of High Voltage & EMC, North China Electric Power University, Beijing 102206, China;2. Electric Power Research Institute of China Southern Power Grid Co., Ltd., Guangzhou 510080, China;1. Univ. Grenoble Alpes, SIMAP, F-38000 Grenoble, France;2. CNRS, SIMAP, F-38000 Grenoble, France;3. Department of Materials Engineering, the University of British Columbia, Vancouver, BC V6T 1Z4, Canada;4. Aix-Marseille Université, CNRS, IM2NP UMR 7334, Campus de Saint-Jérôme, Avenue Escadrille Normandie Niemen, Case 142, F-13397 Marseille, France |
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| Abstract: | The 17-4 PH stainless steel is employed to produce piston rods in industry due to the high strength and toughness, good workability and nice corrosion resistance. In the present failure analysis, obvious long cracks were observed along the longitudinal direction on the surface of the commercial 17-4 PH stainless steel piston rod after heat treatment. The cracks were carefully looked into by observing the crack tip and characterizing the microstructure along the cracks. The results showed that the cracks were mostly initiated from the surface of the rod and propagated along the phase boundary between martensite and δ ferrite. The EDXA showed that the segregation of Cu and Ni should be responsible for the cracking after heat treatment. In order to define when the crack was coming into being, oxidation film along the crack was considered as a clue. The scrutiny of the oxidation film on the crack edge illustrated that the crack should be formed right in the heat treatment of aging. |
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