The effect of ageing on the ductility of 9Cr-1 Mo steel |
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| Affiliation: | 1. Institute of Strength Physics and Materials Science SB RAS, 2/4 Academichesky Ave., Tomsk, Russia;2. National Research Tomsk State University, Tomsk, Russia;1. Indian Institute of Technology Madras, Chennai 600036, India;2. Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;3. School of Technology, GITAM University, Hyderabad 502329, India;1. Department of Materials Science and Engineering, Univ. California, Berkeley, CA, 94720, USA;2. Technical Research Laboratories, POSCO, Gwangyang, 545-711, South Korea;3. Graduate Institute of Ferrous Technology, POSTECH, Pohang, South Korea |
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| Abstract: | A study has been made of the effects of ageing at 550°C on the ductility and fracture mechanisms in a 9 Cr-1 Mo steel. Although the fracture mode remains ductile, ageing at times up to 5000 h causes a progressive reduction in ductility. Voids are nucleated at both coarsely distributed inclusions and at much more finely distributed precipitates, and the principal effect of ageing is to enhance void formation at precipitates. This enhancement is due to a combination of phosphorus segregation to carbide precipitate-matrix interfaces and, after ageing for 5000 h, to the precipitation of Fe2Mo (Laves phase). An important aspect of the observations is that void nucleation at precipitates occurs continuously with increasing strain until failure occurs and the results are consistent with a failure criterion based on the achievement of a critical void spacing. |
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