Precipitation related anomalies in kinetics of phosphorus grain boundary segregation in low alloy steels |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;2. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;3. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China;4. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;5. Department of Materials Science & Engineering, City University of Hong Kong, Hong Kong, China;6. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China;1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China;2. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China;3. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;4. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China |
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| Abstract: | It has been shown that particles of M6C in Cr–Mo–V low alloy steels can influence phosphorus grain boundary segregation in a similar manner to Laves phase particles in 12CrMoV steel. The influence of these particles arises from their ability to dissolve non- metallic elements such as phosphorus and silicon. As phosphorus is progressively segregated to the grain boundaries during prolonged ageing, the precipitation of M6C particles leads to an anomalous decrease in the phosphorus grain boundary concentration as the ageing time is extended. This phenomenon originally observed for the Laves phase in long-term aged 12CrMoV steel at temperatures of 753, 773, and 803 K has now been observed for M6C carbide in a 2.5Cr–0.4Mo–0.25V low alloy steel aged at 853 K. |
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