Microstructure and dry-sliding wear properties of DC plasma nitrided 17-4 PH stainless steel |
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Authors: | Gui-jiang Li Cong Li Jian Gao |
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Affiliation: | a College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China b Nuclear Power Institute of China, Chengdu 610041, China c Chengdu Tool Institute, Sichuan, Xindu 610051, China |
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Abstract: | An attempt that the precipitation hardening steel 17-4PH was conducted by DC plasma nitriding (DCPN) is made to develop a kind of candidate material for nuclear reactor. Nitriding process performed at temperature ? 400 °C takes effect on creation of the layers composed of S-phase (expanded austenite) and (expanded martensite). Up to the temperature of 420 °C, the S-phase peaks disappear due to the transformation occurrence (S-phase → + CrN). For the samples nitrided at temperature ? 450 °C, no evidence of is found owing to a precipitation ( ) taking place. For the 480 °C/4 h treated sample, it is the surface microhardness that plays the lead role in the wear rate reduction but the surface roughness; while for the 400 °C/4 h treated sample, it is both of the surface roughness and the S-phase formation. Dry sliding wear of the untreated 17-4PH is mainly characterized by strong adhesion, abrasion and oxidation mechanism. Samples nitrided at 400 °C which is dominated by slight abrasion and plastic deformation exhibit the best dry sliding wear resistance compared to the samples nitrided at other temperatures. |
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Keywords: | 17-4PH stainless steel DC plasma nitriding Microstructure Wear resistance |
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