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Open AccessArticle

Multiple Influences of Molybdenum on the Precipitation Process in a Martensitic PH Stainless Steel

1
Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden
2
Research and Technology Development, SKF Group, SE-41550 Göteborg, Sweden
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1118; https://doi.org/10.3390/met9101118
Received: 22 September 2019 / Revised: 13 October 2019 / Accepted: 17 October 2019 / Published: 19 October 2019
(This article belongs to the Special Issue Application of Atom Probe Tomography in Metallic Materials)
Molybdenum has been found to influence the complex precipitation process in a martensitic precipitation hardening stainless steel during aging at 475 °C in several different ways. Three steels with different Mo content (0, 1.2 and 2.3 at.%) were investigated. Studies of the microstructure were performed with atom probe tomography and energy filtered transmission electron microscopy. It is shown that, at the initial stage of aging, a faster nucleation of Cu-rich clusters takes place with increasing Mo content. The Cu-clusters act as precipitation sites for other solute elements and promote the nucleation of Ni-rich phases. During further aging, a higher Mo content in the material instead slows down the growth and coarsening of the Ni-rich phases, because Mo segregates to the interface between precipitate and matrix. Additionally, Mo promotes decomposition of the matrix into α and α′ regions. After longer aging times (>40 h) quasicrystalline Mo-rich R′ phase forms (to a greater extent in the material having the highest Mo content). The observations serve to understand the hardness evolution during aging. View Full-Text
Keywords: atom probe tomography; energy filtered transmission electron microscopy; aging; precipitation; stainless steels atom probe tomography; energy filtered transmission electron microscopy; aging; precipitation; stainless steels
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Thuvander, M.; Andersson, M.; Stiller, K. Multiple Influences of Molybdenum on the Precipitation Process in a Martensitic PH Stainless Steel. Metals 2019, 9, 1118.

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